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Zeitschriftenartikel zum Thema „Nika2“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

Zuletzt aktualisiert am 19. Juli 2025

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1

Ritacco, A., R. Adam, P. Ade, et al. "The NIKA polarimeter on science targets: Crab nebula observations at 150 GHz and dual-band polarization images of Orion Molecular Cloud OMC-1." EPJ Web of Conferences 228 (2020): 00021. http://dx.doi.org/10.1051/epjconf/202022800021.

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We present here the polarization system of the NIKA camera and give a summary of the main results obtained and performed studies on Orion and the Crab nebula. The polarization system was equipped with a room temperature continuously rotating multi-mesh half wave plate and a grid polarizer facing the NIKA cryostat window. NIKA even though less sensitive than NIKA2 had polarization capability in both 1 and 2 millimiter bands. NIKA polarization observations demonstrated the ability of such a technology in detecting the polarization of different targets, compact and extended sources like the Crab

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Ritacco, A., N. Ponthieu, A. Catalano, et al. "Polarimetry at millimeter wavelengths with the NIKA camera: calibration and performance." Astronomy & Astrophysics 599 (February 23, 2017): A34. http://dx.doi.org/10.1051/0004-6361/201629666.

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Magnetic fields, which play a major role in a large number of astrophysical processes can be traced via observations of dust polarization. In particular, Planck low-resolution observations of dust polarization have demonstrated that Galactic filamentary structures, where star formation takes place, are associated to well organized magnetic fields. A better understanding of this process requires detailed observations of galactic dust polarization on scales of 0.01 to 0.1 pc. Such high-resolution polarization observations can be carried out at the IRAM 30 m telescope using the recently installed

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Pisano, G., A. Ritacco, A. Monfardini, et al. "Development and application of metamaterial-based half-wave plates for the NIKA and NIKA2 polarimeters." Astronomy & Astrophysics 658 (January 27, 2022): A24. http://dx.doi.org/10.1051/0004-6361/202038643.

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Context. Large field-of-view imaging and polarimetry instruments operating at millimetre and sub-millimetre wavelengths are fundamental tools to understand the role of magnetic fields in channelling filament material into prestellar cores, providing unique insight in the physics of galactic star-forming regions. Among other topics, at extra-galactic scales, polarisation observations of Active Galactic Nuclei (AGNs) will allow us to constrain the possible physical conditions of the emitting plasma from the jets and/or explore the physics of dust inside supernova remnants. The kilo-pixel New IRA

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Ajeddig, H., R. Adam, P. Ade, et al. "Preliminary results on the instrumental polarization of NIKA2-Pol at the IRAM 30m telescope." EPJ Web of Conferences 228 (2020): 00002. http://dx.doi.org/10.1051/epjconf/202022800002.

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Clarifying the role of magnetic fields in the star formation process is crucial. Observations have already shown that magnetic fields play an important role in the early stages of star formation. The high spatial resolution (∼0.01 to 0.05 pc) provided by NIKA2-Pol 1.2 mm imaging polarimetry of nearby clouds will help us clarify the geometry of the B-field within dense cores and molecular filaments as part of the IRAM 30m large program B-FUN. There are numerous challenging issues in the validation of NIKA2-Pol such as the calibration of instrumental polarization. The commissioning phase of NIKA

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Muñoz-Echeverría, M., R. Adam, P. Ade, et al. "The LPSZ-CLASH galaxy cluster sample: Combining lensing and hydrostatic mass estimates." EPJ Web of Conferences 257 (2022): 00033. http://dx.doi.org/10.1051/epjconf/202225700033.

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Starting from the clusters included in the NIKA sample and in the NIKA2 Sunyaev-Zel’dovich Large Program (LPSZ) we have selected a sample of six common objects with the Cluster Lensing And Supernova survey with Hubble (CLASH) lensing data. For the LPSZ clusters we have at our disposal both high-angular resolution observations of the thermal SZ with NIKA and NIKA2 and X-ray observations with XMM-Newton from which hydrostatic mass estimates can be derived. In addition, the CLASH dataset includes lensing convergence maps that can be converted into lensing estimates of the total mass of the cluste

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Kéruzoré, F., F. Mayet, G. W. Pratt, et al. "Exploiting NIKA2/XMM-Newton imaging synergy for intermediate-mass high-z galaxy clusters within the NIKA2 SZ large program." Astronomy & Astrophysics 644 (December 2020): A93. http://dx.doi.org/10.1051/0004-6361/202038933.

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High-resolution mapping of the intracluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially resolved Sunyaev-Zel’dovich (SZ)/X-ray analysis of ACT-CL J0215.4+0030, a high-redshift (z = 0.865) galaxy cluster of intermediate mass (M500 ≃ 3.5 × 1014 M⊙) observed as part of the ongoing NIKA2 SZ large program, which is a follow-up of a representative sample of objects at 0.5 ≤ z ≤ 0.9. In addition to the f

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Lefèvre, Charlène, Carsten Kramer, Roberto Neri, Stefano Berta, and Karl Schuster. "NOEMA complementarity with NIKA2." EPJ Web of Conferences 228 (2020): 00014. http://dx.doi.org/10.1051/epjconf/202022800014.

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IRAM operates two observatories - the 30-meter Telescope on Pico Veleta in Spain and NOEMA, an interferometer of ten 15-meter antennas on Plateau de Bure in France. Both observatories allow to observe at millimeter wavelengths. Here, we aim at discussing the complementary between continuum observations with NOEMA and NIKA2 at the 30m and their role at the cutting edge of research in astronomy. In particular, we will review possible synergies of continuum studies from nearby star forming regions to high red-shift galaxies at cosmological distances.

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Mayet, F., R. Adam, P. Ade, et al. "Cluster cosmology with the NIKA2 SZ Large Program." EPJ Web of Conferences 228 (2020): 00017. http://dx.doi.org/10.1051/epjconf/202022800017.

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The main limiting factor of cosmological analyses based on thermal Sunyaev-Zel’dovich (SZ) cluster statistics comes from the bias and systematic uncertainties that affect the estimates of the mass of galaxy clusters. High-angular resolution SZ observations at high redshift are needed to study a potential redshift or morphology dependence of both the mean pressure profile and of the mass-observable scaling relation used in SZ cosmological analyses. The NIKA2 camera is a new generation continuum instrument installed at the IRAM 30-m telescope. With a large field of view, a high angular resolutio

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Ritacco, A., R. Adam, P. Ade, et al. "Observing with NIKA2Pol from the IRAM 30m telescope : Early results on the commissioning phase." EPJ Web of Conferences 228 (2020): 00022. http://dx.doi.org/10.1051/epjconf/202022800022.

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The NIKA2 polarization channel at 260 GHz (1.15 mm) has been proposed primarily to observe galactic star-forming regions and probe the critical scales between 0.01-0.05 pc at which magnetic field lines may channel the matter of interstellar filaments into growing dense cores. The NIKA2 polarime-ter consists of a room temperature continuously rotating multi-mesh HWP and a cold polarizer that separates the two orthogonal polarizations onto two 260 GHz KIDs arrays. We describe in this paper the preliminary results obtained during the most recent commissioning campaign performed in December 2018.

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De Petris, Marco, Florian Ruppin, Federico Sembolini, et al. "Confirmation of NIKA2 investigation of the Sunyaev-Zel’dovich effect by using synthetic clusters of galaxies." EPJ Web of Conferences 228 (2020): 00008. http://dx.doi.org/10.1051/epjconf/202022800008.

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The NIKA2 Sunyaev-Zel’dovich Large Program (SZLP) is focused on mapping the thermal SZ signal of a representative sample of selected Planck and ACT clusters spanning the redshift range 0.5 < z < 0.9. Hydrodynamical N-body simulations prove to be a powerful tool to endorse NIKA2 capabilities for estimating the impact of IntraCluster Medium (ICM) disturbances when re- covering the pressure radial profiles. For this goal we employ a subsample of objects, carefully extracted from the catalog Marenostrum MUltidark SImulations of galaxy Clusters (MUSIC), spanning equivalent redshift and mass r

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Ruppin, F., F. Sembolini, M. De Petris, et al. "Impact of ICM disturbances on the mean pressure profile of galaxy clusters: A prospective study of the NIKA2 SZ large program with MUSIC synthetic clusters." Astronomy & Astrophysics 631 (October 15, 2019): A21. http://dx.doi.org/10.1051/0004-6361/201935059.

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Context. The mean pressure profile of the galaxy cluster population plays an essential role in cosmological analyses. An accurate characterization of the shape, intrinsic scatter, and redshift evolution of this profile is necessary to estimate some of the biases and systematic effects that currently prevent cosmological analyses based on thermal Sunyaev-Zel’dovich (tSZ) surveys from obtaining precise and unbiased cosmological constraints. This is one of the main goals of the ongoing NIKA2 SZ large program, which aims at mapping the tSZ signal of a representative cluster sample selected from th

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Kéruzoré, F., R. Adam, P. Ade, et al. "A low-mass galaxy cluster as a test-case study for the NIKA2 SZ Large Program." EPJ Web of Conferences 228 (2020): 00012. http://dx.doi.org/10.1051/epjconf/202022800012.

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High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high-resolution follow-up of 45 galaxy clusters covering a wide mass range at high redshift in order to re-calibrate some of the tools needed for the cosmological exploitation of SZ surveys. We present the second cluster analysis of this program, targeting one of the faintest sources of the sample in order to tackle the difficulties in data reduction for suc

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Roussel, H., N. Ponthieu, R. Adam, et al. "NIKA2 mapping and cross-instrument SED extraction of extended sources with Scanamorphos." EPJ Web of Conferences 228 (2020): 00024. http://dx.doi.org/10.1051/epjconf/202022800024.

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The steps taken to tailor to NIKA2 observations the Scanamorphos algorithm (initially developed to subtract low-frequency noise from Herschel on-the-fly observations) are described, focussing on the consequences of the different instrument architecture and observation strategy. The method, making the most extensive use of the redundancy built in the multi-scan coverage with large arrays of a given region of the sky, is applicable to extended sources, while the pipeline is so far optimized for compact sources. An example of application is given. A related tool to build consistent broadband SEDs

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Perotto, L., R. Adam, P. Ade, et al. "The NIKA2 Sunyaev-Zeldovich Large Program." EPJ Web of Conferences 293 (2024): 00040. http://dx.doi.org/10.1051/epjconf/202429300040.

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The NIKA2 camera operating at the IRAM 30-m telescope excels in high-angular resolution mapping of the thermal Sunyaev-Zel’dovich effect towards galaxy clusters at intermediate and high-redshift. As part of the NIKA2 guaranteed-time, the SZ Large Program (LPSZ) aims at tSZ-mapping a representative sample of SZ-selected galaxy clusters in the catalogues of the Planck satellite and of the Atacama Cosmology Telescope, and also observed in X-ray with XMM-Newton or Chandra. Having completed observations in January 2023, we present tSZ maps of 38 clusters spanning the targeted mass (3 < M500/1014

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Ruppin, F., F. Mayet, G. W. Pratt, et al. "First Sunyaev–Zel’dovich mapping with the NIKA2 camera: Implication of cluster substructures for the pressure profile and mass estimate." Astronomy & Astrophysics 615 (July 2018): A112. http://dx.doi.org/10.1051/0004-6361/201732558.

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The complete characterization of the pressure profile of high-redshift galaxy clusters, from their core to their outskirts, is a major issue for the study of the formation of large-scale structures. It is essential to constrain a potential redshift evolution of both the slope and scatter of the mass-observable scaling relations used in cosmology studies based on cluster statistics. In this paper, we present the first thermal Sunyaev–Zel’dovich (tSZ) mapping of a cluster from the sample of the New IRAM Kids Arrays (NIKA2) SZ large program that aims at constraining the redshift evolution of clus

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Muñoz-Echeverría, M., R. Adam, P. Ade, et al. "Multi-probe analysis of the galaxy cluster CL J1226.9+3332: Hydrostatic mass and hydrostatic-to-lensing bias." EPJ Web of Conferences 257 (2022): 00032. http://dx.doi.org/10.1051/epjconf/202225700032.

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We present a multi-probe analysis of the well-known galaxy cluster CL J1226.9+3332 as a proof of concept for multi-wavelength studies within the framework of the NIKA2 Sunyaev-Zel’dovich Large Program (LPSZ). CL J1226.9+3332 is a massive and high redshift (z = 0.888) cluster that has already been observed at several wavelengths. A joint analysis of the thermal SZ (tSZ) effect at millimeter wavelength with the NIKA2 camera and in X-ray with the XMM-Newton satellite permits the reconstruction of the cluster’s thermodynamical properties and mass assuming hydrostatic equilibrium. We test the robus

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Perotto, L., R. Adam, P. Ade, et al. "The NIKA2 Sunyaev-Zeldovich Large Program: Precise galaxy cluster physics for an accurate cluster-based cosmology." EPJ Web of Conferences 257 (2022): 00038. http://dx.doi.org/10.1051/epjconf/202225700038.

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The NIKA2 Guaranteed-Time SZ Large Program (LPSZ) is dedicated to the high-angular resolution SZ mapping of a representative sample of 45 SZ-selected galaxy clusters drawn from the catalogues of the Planck satellite, or of the Atacama Cosmology Telescope. The LPSZ sample spans a mass range from 3 to 11 × 1014M⊙ and a redshift range from 0:5 to 0:9, extending to higher redshift and lower mass the previous samples dedicated to the cluster mass calibration and universal properties estimation. The main goals of the LPSZ are the measurement of the average radial profile of the ICM pressure up to R5

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Galliano, Frédéric. "Cosmic dust evolution: The challenges for NIKA2." EPJ Web of Conferences 257 (2022): 00019. http://dx.doi.org/10.1051/epjconf/202225700019.

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I summarize a recent study aimed at constraining dust evolution timescales in nearby galaxies. We were able to quantify the effciency of dust condensation in SN II ejecta, grain growth in the ISM and dust destruction by SN II blast waves. Around Solar metallicity, our results are consistent with what we know in the Milky Way, that is dust production is dominated by grain growth. We however show that this changes with metallicity. The dust content in very-low-metallicity systems is dominated by grains that have formed in SN II ejecta. I end this article with a discussion about the potential of

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Bourrion, O., A. Benoit, J. L. Bouly, et al. "NIKEL_AMC: readout electronics for the NIKA2 experiment." Journal of Instrumentation 11, no. 11 (2016): P11001. http://dx.doi.org/10.1088/1748-0221/11/11/p11001.

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Shu, S., M. Calvo, S. Leclercq, J. Goupy, A. Monfardini, and E. F. C. Driessen. "Prototype High Angular Resolution LEKIDs for NIKA2." Journal of Low Temperature Physics 193, no. 3-4 (2018): 141–48. http://dx.doi.org/10.1007/s10909-018-1997-x.

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Ricardo Rizzo, J., Alessia Ritacco, and Cristobal Bordiu. "NIKA2 observations around LBV stars Emission from stars and circumstellar material." EPJ Web of Conferences 228 (2020): 00023. http://dx.doi.org/10.1051/epjconf/202022800023.

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Luminous Blue Variable (LBV) stars are evolved massive objects, previous to core-collapse supernova. LBVs are characterized by photometric and spectroscopic variability, produced by strong and dense winds, mass-loss events and very intense UV radiation. LBVs strongly disturb their surroundings by heating and shocking, and produce important amounts of dust. The study of the circumstellar material is therefore crucial to understand how these massive stars evolve, and also to characterize their effects onto the interstellar medium. The versatility of NIKA2 is a key in providing simultaneous obser

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Nersesian, A., R. Adam, P. Ade, et al. "Stellar and dust emission profiles of IMEGIN galaxies." EPJ Web of Conferences 293 (2024): 00034. http://dx.doi.org/10.1051/epjconf/202429300034.

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We present a morphological analysis of a set of spiral galaxies from the NIKA2 Guaranteed Time Large Program, IMEGIN. We have fitted a single Sérsic model on a set of broadband images, from ultra-violet (UV) to millimeter (mm) wavelengths, using the modelling code Statmorph. With the recently acquired NIKA2 1.15- and 2-mm observations, it is possible to extend such a morphological analysis to the mm regime and investigate the two-dimensional (2D) distribution (exponential, Gaussian) of the very cold dust (<15 K). We show preliminary results of the 2D large-scale distribution of stars and du

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Katsioli, S., R. Adam, P. Ade, et al. "Exploring the millimetre emission in nearby galaxies: Analysis of the edge-on galaxy NGC 891." EPJ Web of Conferences 257 (2022): 00023. http://dx.doi.org/10.1051/epjconf/202225700023.

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New observations of the edge-on galaxy NGC 891, at 1.15 and 2mm obtained with the IRAM 30-m telescope and the NIKA2 camera, within the framework of the IMEGIN (Interpreting the Millimetre Emission of Galaxies with IRAM and NIKA2) Large Program, are presented in this work. By using multiwavelength maps (from the mid-IR to the cm wavelengths) we perform SED fitting in order to extract the physical properties of the galaxy on both global and local (~kpc) scales. For the interpretation of the observations we make use of a state-of-the-art SED fitting code, HerBIE (HiERarchical Bayesian Inference f

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Ajeddig, H., R. Adam, P. Ade, et al. "Probing the role of magnetic fields in star-forming filaments: NIKA2-Pol commissioning results toward OMC-1." EPJ Web of Conferences 257 (2022): 00002. http://dx.doi.org/10.1051/epjconf/202225700002.

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Dust polarization observations are a powerful, practical tool to probe the geometry (and to some extent, the strength) of magnetic fields in starforming regions. In particular, Planck polarization data have revealed the importance of magnetic fields on large scales in molecular clouds. However, due to insufficient resolution, Planck observations are unable to constrain the B-field geometry on prestellar and protostellar scales. The high angular resolution of 11.7 arcsec provided by NIKA2-Pol 1.15 mm polarimetric imaging, corresponding to 0.02 pc at the distance of the Orion molecular cloud (OM

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Perotto, L., N. Ponthieu, J. F. Macías-Pérez, et al. "Calibration and performance of the NIKA2 camera at the IRAM 30-m Telescope." Astronomy & Astrophysics 637 (May 2020): A71. http://dx.doi.org/10.1051/0004-6361/201936220.

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Context. NIKA2 is a dual-band millimetre continuum camera of 2 900 kinetic inductance detectors, operating at 150 and 260 GHz, installed at the IRAM 30-m telescope in Spain. Open to the scientific community since October 2017, NIKA2 will provide key observations for the next decade to address a wide range of open questions in astrophysics and cosmology. Aims. Our aim is to present the calibration method and the performance assessment of NIKA2 after one year of observation. Methods. We used a large data set acquired between January 2017 and February 2018 including observations of primary and se

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Lestrade, J. F., J. C. Augereau, M. Booth, et al. "Debris disks around stars in the NIKA2 era." EPJ Web of Conferences 228 (2020): 00015. http://dx.doi.org/10.1051/epjconf/202022800015.

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The new NIKA2 camera at the IRAM 30m radiotelescope was used to observe three known debris disks in order to constrain the SED of their dust emission in the millimeter wavelength domain. We have found that the spectral index between the two NIKA2 bands (1mm and 2mm) is consistent with the Rayleigh-Jeans regime (λ-2), unlike the steeper spectra (λ-3) measured in the submillimeter-wavelength domain for two of the three disks - around the stars Vega and HD107146. We provide a succesful proof of concept to model this spectral inversion in using two populations of dust grains, those smaller and tho

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Bing, L., R. Adam, P. Ade, et al. "Searching for high-z DSFGs with NIKA2 and NOEMA." EPJ Web of Conferences 257 (2022): 00006. http://dx.doi.org/10.1051/epjconf/202225700006.

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As the possible progenitors of passive galaxies at z=2-3, dusty starforming galaxies (DSFGs) at z>4 provide a unique perspective to study the formation, assembly, and early quenching of massive galaxies in the early Universe. The extreme obscuration in optical-IR makes (sub)mm spectral scans the most universal and unbiased way to confirm/exclude the high-z nature of candidate dusty star-forming galaxies. We present here the status of the NIKA2 Cosmological Legacy Survey (N2CLS), which is the deepest wide-area singledish survey in the millimeter searching for high-z DSFGs. We also introduce

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Lestrade, J. F., R. Adam, P. Ade, et al. "Overdensity of SubMillimiter Galaxies in the GJ526 Field mapped with the NIKA2 Camera." EPJ Web of Conferences 257 (2022): 00027. http://dx.doi.org/10.1051/epjconf/202225700027.

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Using the NIKA2 dual band millimeter camera installed on the IRAM30m telescope, we have mapped a relatively large field (~ 70 arcmin2) in the direction of the star GJ526 to investigate the nature of the sources found with the MAMBO camera at 1.2 mm ten years earlier. We have found that they must be dust-obscured galaxies (SMGs) in the background beyond the star. The new NIKA2 map at 1.15 mm reveals additional sources and, in fact, an overdensity of SMGs predominantly distributed along a filament-like structure in projection on the sky across the whole observed field. We speculate this might be

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Ejlali, G., R. Adam, P. Ade, et al. "Dust Emission in Galaxies at Millimeter Wavelengths: Cooling of star forming regions in NGC6946." EPJ Web of Conferences 257 (2022): 00016. http://dx.doi.org/10.1051/epjconf/202225700016.

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Interstellar dust plays an important role in the formation of molecular gas and the heating and cooling of the interstellar medium. The spatial distribution of the mm-wavelength dust emission from galaxies is largely unexplored. The NIKA2 Guaranteed Time Project IMEGIN (Interpreting the Millimeter Emission of Galaxies with IRAM and NIKA2) has recently mapped the mm emission in the grand design spiral galaxy NGC6946. By subtracting the contributions from the free-free, synchrotron, and CO line emission, we map the distribution of the pure dust emission at 1:15mm and 2mm. Separating the arm/inte

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Ruppin, F., R. Adam, P. Ade, et al. "Mapping the intracluster medium temperature in the era of NIKA2 and MUSTANG-2." EPJ Web of Conferences 257 (2022): 00043. http://dx.doi.org/10.1051/epjconf/202225700043.

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We present preliminary results from an on-going program that aims at mapping the intracluster medium (ICM) temperature of high redshift galaxy clusters from the MaDCoWS sample using a joint analysis of shallow X-ray data obtained by Chandra and high angular resolution Sunyaev-Zel’dovich (SZ) observations realized with the NIKA2 and MUSTANG-2 cameras. We also present preliminary results from an on-going Open Time program within the NIKA2 collaboration that aims at mapping the ICM temperature of a galaxy cluster at z = 0.45 from the resolved detection of the relativistic corrections to the SZ sp

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Ruppin, F., R. Adam, P. Ade, et al. "Mapping the gas thermodynamic properties of the massive cluster merger MOO J1142+1527 at z = 1.2." EPJ Web of Conferences 228 (2020): 00026. http://dx.doi.org/10.1051/epjconf/202022800026.

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We present the results of the analysis of the very massive cluster MOO J1142+1527 at a redshift z = 1.2 based on high angular resolution NIKA2 Sunyaev-Zel’dovich (SZ) and Chandra X-ray data. This multi-wavelength analysis enables us to estimate the shape of the temperature profile with unprecedented precision at this redshift and to obtain a map of the gas entropy distribution averaged along the line of sight. The comparison between the cluster morphological properties observed in the NIKA2 and Chandra maps together with the analysis of the entropy map allows us to conclude that MOOJ1142+1527

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Rigby, A. J., R. Adam, P. Ade, et al. "Galactic Star Formation with NIKA2 (GASTON): Evidence of mass accretion onto dense clumps." EPJ Web of Conferences 257 (2022): 00041. http://dx.doi.org/10.1051/epjconf/202225700041.

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High-mass stars (m* ≳ 8 M⊙) play a crucial role in the evolution of galaxies, and so it is imperative that we understand how they are formed. We have used the New IRAM KIDs Array 2 (NIKA2) camera on the Institut de Radio Astronomie Millimétrique (IRAM) 30-m telescope to conduct high-sensitivity continuum mapping of ~ 2 deg2 of the Galactic plane (GP) as part of the Galactic Star Formation with NIKA2 (GASTON) large program. We have identified a total of 1467 clumps within our deep 1.15 mm continuum maps and, by using overlapping continuum, molecular line, and maser parallax data, we have determ

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Hanser, C., R. Adam, P. Ade, et al. "Towards the first mean pressure profile estimate with the NIKA2 Sunyaev-Zeldovich Large Program." EPJ Web of Conferences 293 (2024): 00024. http://dx.doi.org/10.1051/epjconf/202429300024.

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High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high-resolution follow-up of 38 galaxy clusters covering a wide mass range at intermediate to high redshift. The measured SZ fluxes will be essential to calibrate the SZ scaling relation and the galaxy clusters mean pressure profile, needed for the cosmological exploitation of SZ surveys. We present in this study a method to infer a mean pressure profile fro

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De Petris, M., A. Ferragamo, and F. Mayet. "Foreword: Observing the mm Universe with the NIKA2 camera." EPJ Web of Conferences 257 (2022): 00001. http://dx.doi.org/10.1051/epjconf/202225700001.

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Mayet, F., A. Catalano, J. F. Macías-Pérez, and L. Perotto. "Foreword Observing the mm Universe with the NIKA2 camera." EPJ Web of Conferences 228 (2020): 00001. http://dx.doi.org/10.1051/epjconf/202022800001.

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36

Moyer-Anin, A., R. Adam, P. Ade, et al. "Systematic effects on the upcoming NIKA2 LPSZ scaling relation." EPJ Web of Conferences 293 (2024): 00032. http://dx.doi.org/10.1051/epjconf/202429300032.

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In cluster cosmology, cluster masses are the main parameter of interest. They are needed to constrain cosmological parameters through the cluster number count. As the mass is not an observable, a scaling relation is needed to link cluster masses to the integrated Compton parameters Y, i.e. the Sunyaev-Zeldovich observable (SZ). Planck cosmological results obtained with cluster number counts are based on a scaling relation measured with clusters at low redshift (z<0.5) observed in SZ and X-ray. In the SZ Large Program (LPSZ) of the NIKA2 collaboration, the scaling relation will be obtained w

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Kramer, C., R. Adam, P. Ade, et al. "NIKA2 observations of starless cores in Taurus and Perseus." EPJ Web of Conferences 293 (2024): 00027. http://dx.doi.org/10.1051/epjconf/202429300027.

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Dusty starless cores play an important role in regulating the initial phases of the formation of stars and planets. In their interiors, dust grains coagulate and ice mantles form, thereby changing the millimeter emissivities and hence the ability to cool. We mapped four regions with more than a dozen cores in the nearby Galactic filaments of Taurus and Perseus using the NIKA2 camera at the IRAM 30-meter telescope. Combining the 1mm to 2mm flux ratio maps with dust temperature maps from Herschel allowed to create maps of the dust emissivity index β1,2 at resolutions of 2430 and 5600 a.u. in Tau

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Katsioli, S., R. Adam, P. Ade, et al. "Exploring the interstellar medium of NGC 891 at millimeter wavelengths using the NIKA2 camera." EPJ Web of Conferences 293 (2024): 00026. http://dx.doi.org/10.1051/epjconf/202429300026.

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In the framework of the IMEGIN Large Program, we used the NIKA2 camera on the IRAM 30-m telescope to observe the edge-on galaxy NGC 891 at 1.15 mm and 2 mm and at a FWHM of 11.1” and 17.6”, respectively. Multiwavelength data enriched with the new NIKA2 observations fitted by the HerBIE SED code (coupled with the THEMIS dust model) were used to constrain the physical properties of the ISM. Emission originating from the diffuse dust disk is detected at all wavelengths from mid-IR to mm. while mid-lR observations reveal warm dust emission from compact H II regions. Indications of mm excess emissi

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Nersesian, Angelos, Maarten Baes, and Suzanne C. Madden. "Modelling the cold dust in nearby spiral galaxies with radiative transfer." EPJ Web of Conferences 257 (2022): 00034. http://dx.doi.org/10.1051/epjconf/202225700034.

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Cosmic dust grains are one of the fundamental ingredients of the interstellar medium (ISM). In spite of their small contribution to the total mass budget, dust grains play a significant role in the physical and chemical evolution of galaxies. Over the past decades, a plethora of multi-wavelength data, from UV to far-infrared, has increased substantially our knowledge on the dust properties of nearby galaxies. Nevertheless, one regime of the spectrum, the mm range, remains relatively unexplored. Thanks to the new, high-resolution data in the mm range observed with the NIKA2 instrument and our r

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Nguyen-Luong, Q., R. Adam, P. Ade, et al. "NIKA2 observations of dust grain evolution from star-forming filament to T-Tauri disk: Preliminary results from NIKA2 observations of the Taurus B211/B213 filament." EPJ Web of Conferences 293 (2024): 00035. http://dx.doi.org/10.1051/epjconf/202429300035.

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To understand the evolution of dust properties in molecular clouds in the course of the star formation process, we constrain the changes in the dust emissivity index from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using the NIKA2 continuum camera on the IRAM 30 m telescope. we observed the Taurus B211/B2I3 filament at 1.2 mm and 2 mm with unprecedented sensitivity and used the resulting maps to derive the dust emissivity index β. Our sample of 105 objects detected in the β map of the B211/B213 filament indicates that, overal. β decreases from filament and pre

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Goupy, J., A. Adane, A. Benoit, et al. "Microfabrication Technology for Large Lekid Arrays: From Nika2 to Future Applications." Journal of Low Temperature Physics 184, no. 3-4 (2016): 661–67. http://dx.doi.org/10.1007/s10909-016-1531-y.

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Catalano, A., R. Adam, P. A. R. Ade, et al. "The NIKA2 Instrument at 30-m IRAM Telescope: Performance and Results." Journal of Low Temperature Physics 193, no. 5-6 (2018): 916–22. http://dx.doi.org/10.1007/s10909-018-1884-5.

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Ricci, M., R. Adam, D. Eckert, et al. "The XXL Survey." Astronomy & Astrophysics 642 (October 2020): A126. http://dx.doi.org/10.1051/0004-6361/201937249.

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High-mass clusters at low redshifts have been intensively studied at various wavelengths. However, while more distant objects at lower masses constitute the bulk population of future surveys, their physical state remain poorly explored to date. In this paper, we present resolved observations of the Sunyaev-Zel’dovich (SZ) effect, obtained with the NIKA2 camera, towards the cluster of galaxies XLSSC 102, a relatively low-mass system (M500 ∼ 2 × 1014 M⊙) at z = 0.97 detected from the XXL survey. We combine NIKA2 SZ data, XMM-Newton X-ray data, and Megacam optical data to explore, respectively, t

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Calvo, M., A. Benoît, A. Catalano, et al. "The NIKA2 Instrument, A Dual-Band Kilopixel KID Array for Millimetric Astronomy." Journal of Low Temperature Physics 184, no. 3-4 (2016): 816–23. http://dx.doi.org/10.1007/s10909-016-1582-0.

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Adam, R., A. Adane, P. A. R. Ade, et al. "The NIKA2 large-field-of-view millimetre continuum camera for the 30 m IRAM telescope." Astronomy & Astrophysics 609 (January 2018): A115. http://dx.doi.org/10.1051/0004-6361/201731503.

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Context. Millimetre-wave continuum astronomy is today an indispensable tool for both general astrophysics studies (e.g. star formation, nearby galaxies) and cosmology (e.g. cosmic microwave background and high-redshift galaxies). General purpose, large-field-of-view instruments are needed to map the sky at intermediate angular scales not accessible by the high-resolution interferometers (e.g. ALMA in Chile, NOEMA in the French Alps) and by the coarse angular resolution space-borne or ground-based surveys (e.g. Planck, ACT, SPT). These instruments have to be installed at the focal plane of the

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Ritacco, A., L. Bizzarri, S. Savorgnano, et al. "Absolute Reference for Microwave Polarization Experiments. The COSMOCal Project and its Proof of Concept." Publications of the Astronomical Society of the Pacific 136, no. 11 (2024): 115001. http://dx.doi.org/10.1088/1538-3873/ad8aed.

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Abstract Context. The cosmic microwave background (CMB), a remnant of the Big Bang, provides unparalleled insights into the primordial universe, its energy content, and the origin of cosmic structures. The success of forthcoming terrestrial and space experiments hinges on meticulously calibrated data. Specifically, the ability to achieve an absolute calibration of the polarization angles with a precision of <0.°1 is crucial to identify the signatures of primordial gravitational waves and cosmic birefringence within the CMB polarization. Aims. We introduce the COSmological Microwave Observat

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Bianchi, Simone, Matteo Murgia, Andrea Melis, et al. "The mm-to-cm SED of spiral galaxies." EPJ Web of Conferences 257 (2022): 00005. http://dx.doi.org/10.1051/epjconf/202225700005.

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The mm-to-cm range of the Spectral Energy Distribution of spiral galaxies remains largely unexplored. Its coverage is required to disentangle the contribution of dust emission, free-free and synchrotron radiation and can provide constraints on dust models, star-formation rates and ISM properties. We present the case for a synergy between NIKA2 observations of nearby spirals and those from planned and current instrumentation at the Sardinia Radio Telescope, and report on a pilot K-band program to search for Anomalous Microwave Emission, an elusive emission component which is presumably related

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Lefèvre, Charlène, Laurent Pagani, Bilal Ladjelate, Michiel Min, Hiroyuki Hirashita, and Robert Zylka. "Dust evolution in pre-stellar cores." EPJ Web of Conferences 228 (2020): 00013. http://dx.doi.org/10.1051/epjconf/202022800013.

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Dust grains are the building blocks of future planets. They evolve in size, shape and composition during the life cycle of the interstellar medium. We seek to understand the process which leads from diffuse medium grains to dust grains in the vicinity of protostars inside disks. As a first step, we propose to characterize the dust evolution inside pre-stellar cores thanks to multi-wavelength observations. We will present how NIKA2 maps are crucial to better constrain dust properties and we will introduce SIGMA: a new flexible dust model in open access.

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Poidevin, Frédérick. "Analysis of Galactic molecular cloud polarization maps: a review of the methods." EPJ Web of Conferences 228 (2020): 00019. http://dx.doi.org/10.1051/epjconf/202022800019.

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The Davis-Chandrasekhar-Fermi (DCF) method using the Angular Dispersion Function (ADF), the Histogram of Relative Orientations (HROs) and the Polarization-Intensity Gradient Relation (P-IGR) are the most common tools used to analyse maps of linearly polarized emission by thermal dust grains at submilliter wavelengths in molecular clouds and star-forming regions. A short review of these methods is given. The combination of these methods will provide valuable tools to shed light on the impact of the magnetic fields on the formation and evolution of subparsec scale hub-filaments that will be mapp

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Romero, C., M. McWilliam, J. F. Macías-Pérez, et al. "A multi-instrument non-parametric reconstruction of the electron pressure profile in the galaxy cluster CLJ1226.9+3332." Astronomy & Astrophysics 612 (April 2018): A39. http://dx.doi.org/10.1051/0004-6361/201731599.

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Context. In the past decade, sensitive, resolved Sunyaev-Zel’dovich (SZ) studies of galaxy clusters have become common. Whereas many previous SZ studies have parameterized the pressure profiles of galaxy clusters, non-parametric reconstructions will provide insights into the thermodynamic state of the intracluster medium. Aim. We seek to recover the non-parametric pressure profiles of the high redshift (z = 0.89) galaxy cluster CLJ 1226.9+3332 as inferred from SZ data from the MUSTANG, NIKA, Bolocam, and Planck instruments, which all probe different angular scales. Methods. Our non-parametric

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