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Journal articles on the topic 'Late Forming Dark Matter (LFDM)'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Chakraborty, Amlan, Prolay K. Chanda, Kanhaiya Lal Pandey, and Subinoy Das. "Formation and Abundance of Late-forming Primordial Black Holes as Dark Matter." Astrophysical Journal 932, no. 2 (2022): 119. http://dx.doi.org/10.3847/1538-4357/ac6ddd.

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Abstract We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of the universe, between the epochs of Big Bang nucleosynthesis and cosmic microwave background photon decoupling. In our setup, one does not need to modify the scale-invariant inflationary power spectra; instead, a late-phase transition in a strongly interacting fermion–scalar fluid (which occurs naturally around redshift 106 ≤ z T ≤ 108) creates an instability in the density perturbation as the sound speed turns imaginary. As a result, the dark matter perturbation grows exp

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Kong, Demao, Manoj Kaplinghat, Hai-Bo Yu, Filippo Fraternali, and Pavel E. Mancera Piña. "The Odd Dark Matter Halos of Isolated Gas-rich Ultradiffuse Galaxies." Astrophysical Journal 936, no. 2 (2022): 166. http://dx.doi.org/10.3847/1538-4357/ac8875.

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Abstract We analyze circular velocity profiles of seven ultradiffuse galaxies (UDGs) that are isolated and gas-rich. Assuming that the dark matter halos of these UDGs have a Navarro–Frenk–White (NFW) density profile or a Read density profile (which allows for constant-density cores), the inferred halo concentrations are systematically lower than the cosmological median, even as low as −0.6 dex (about 5σ away) in some cases. Alternatively, similar fits can be obtained with a density profile that scales roughly as 1/r 2 for radii larger than a few kiloparsecs. Both solutions require the radius w

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Benavides, José A., Laura V. Sales, Mario G. Abadi, Mark Vogelsberger, Federico Marinacci, and Lars Hernquist. "Large Dark Matter Content and Steep Metallicity Profile Predicted for Ultradiffuse Galaxies Formed in High-spin Halos." Astrophysical Journal 977, no. 2 (2024): 169. https://doi.org/10.3847/1538-4357/ad8de8.

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Abstract We study the stellar properties of a sample of simulated ultradiffuse galaxies (UDGs) with stellar mass M ⋆ = 107.5–109 M ⊙, selected from the TNG50 simulation, where UDGs form mainly in high-spin dwarf-mass halos. We divide our sample into star-forming and quenched UDGs, finding good agreement with the stellar assembly history measured in observations. Star-forming UDGs and quenched UDGs with M ⋆ ≥ 108 M ⊙ in our sample are particularly inefficient at forming stars, having 2–10 times less stellar mass than non-UDGs for the same virial mass halo. These results are consistent with rece

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Senapati, Sephalika, Bradley Kabes, and Helge Heinrich. "Ag₂Al plates in Al–Ag alloys." International Journal of Materials Research 97, no. 3 (2006): 325–28. http://dx.doi.org/10.1515/ijmr-2006-0052.

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Abstract The late stages of precipitation in aluminum-rich Al –Ag alloys with silver contents from 3 at.% to 22 at.% were studied with transmission electron microscopy. Shapes, sizes, and arrangements of plates of the stable hexagonal Ag2Al phase forming on {111} planes of the f.c.c. matrix were analysed. The high-angle annular dark-field contrast in scanning transmission electron microscopy is calibrated. This calibration allows for the quantitative measurement of plate thicknesses from high-angle annular dark-field scanning transmission electron micrographs of Ag2Al plates inclined to the el

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Ledinauskas, E., and K. Zubovas. "Reignited star formation in dwarf galaxies that were quenched during reionization." Astronomy & Astrophysics 615 (July 2018): A64. http://dx.doi.org/10.1051/0004-6361/201832824.

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Context. Irregular dwarf galaxies of the Local Group have very varied properties and star formation histories. Some of them formed the majority of their stars very late compared to others. Extreme examples of this are Leo A and Aquarius, which reached the peak of star formation at z < 1 (more than 6 Gyr after the Big Bang). This fact seemingly challenges the ΛCDM cosmological framework because the dark matter halos of these galaxies on average should assemble the majority of their masses before z ~ 2 (<3 Gyr after the Big Bang). Aims. We investigate whether the delayed star formation his

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BOCHNER, BRETT. "COSMIC ACCELERATION AND CONCORDANCE FROM CAUSAL BACKREACTION WITH RECURSIVE NONLINEARITIES." International Journal of Modern Physics D 22, no. 13 (2013): 1330026. http://dx.doi.org/10.1142/s0218271813300267.

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We review the causal backreaction paradigm, in which the need for Dark Energy is eliminated via the generation of an apparent cosmic acceleration from the causal flow of inhomogeneity information coming in from distant structure-forming regions. The formalism detailed here incorporates the effects of "recursive nonlinearities": the process by which already-established metric perturbations will subsequently act to slow-down all future flows of inhomogeneity information. Despite such effects, we find viable cosmological models in which causal backreaction successfully serves as a replacement for

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Ouchi, Masami, Yoshiaki Ono та Takatoshi Shibuya. "Observations of the Lyman-α Universe". Annual Review of Astronomy and Astrophysics 58, № 1 (2020): 617–59. http://dx.doi.org/10.1146/annurev-astro-032620-021859.

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Hydrogen Lyman-α (Lyα) emission has been one of the major observational probes for the high-redshift Universe since the first discoveries of high- z Lyα-emitting galaxies in the late 1990s. Due to the strong Lyα emission originated by resonant scattering and recombination of the most abundant element, Lyα observations witness not only Hii regions of star formation and active galactic nuclei (AGNs) but also diffuse Hi gas in the circumgalactic medium (CGM) and the intergalactic medium (IGM). Here, we review Lyα sources and present theoretical interpretations reached to date. We conclude the fol

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Hadzhiyska, Boryana, Sownak Bose, Daniel Eisenstein, and Lars Hernquist. "Extensions to models of the galaxy–halo connection." Monthly Notices of the Royal Astronomical Society 501, no. 2 (2020): 1603–20. http://dx.doi.org/10.1093/mnras/staa3776.

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ABSTRACT We explore two widely used empirical models for the galaxy–halo connection, subhalo abundance matching (SHAM) and the halo occupation distribution (HOD), and compare them with the hydrodynamical simulation IllustrisTNG (TNG) for multiple statistics quantifying the galaxy distribution at $n_{\rm gal}\approx 1.3\times 10^{-3}\, ({\rm Mpc}\,h^{-1})^{-3}$. We observe that in their most straightforward implementations, both models fail to reproduce the two-point clustering measured in TNG. We find that SHAM models that use the relaxation velocity, Vrelax, and the peak velocity, Vpeak, perf

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9

Falcón-Barroso, J., G. van de Ven, M. Lyubenova, et al. "The CALIFA view on stellar angular momentum across the Hubble sequence." Astronomy & Astrophysics 632 (November 28, 2019): A59. http://dx.doi.org/10.1051/0004-6361/201936413.

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We present the apparent stellar angular momentum over the optical extent of 300 galaxies across the Hubble sequence using integral-field spectroscopic (IFS) data from the CALIFA survey. Adopting the same λR parameter previously used to distinguish between slow and fast rotating early-type (elliptical and lenticular) galaxies, we show that spiral galaxies are almost all fast rotators, as expected. Given the extent of our data, we provide relations for λR measured in different apertures (e.g. fractions of the effective radius: 0.5 Re, Re, 2 Re), including conversions to long-slit 1D apertures. O

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Shelest, A., and F. Lelli. "From spirals to lenticulars: Evidence from the rotation curves and mass models of three early-type galaxies." Astronomy & Astrophysics 641 (September 2020): A31. http://dx.doi.org/10.1051/0004-6361/202038184.

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Rotation curves have traditionally been difficult to trace for early-type galaxies (ETGs) because they often lack a high-density disk of cold gas as in late-type galaxies (LTGs). In this work, we derive rotation curves for three lenticular galaxies from the ATLAS3D survey, combining CO data in the inner parts with deep HI data in the outer regions, extending out to 10−20 effective radii. We also use Spitzer photometry at 3.6 μm to decompose the rotation curves into the contributions of baryons and dark matter (DM). We find that (1) the rotation-curve shapes of these ETGs are similar to those o

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11

Kelly, Ashley J., Adrian Jenkins, and Carlos S. Frenk. "The origin of X-ray coronae around simulated disc galaxies." Monthly Notices of the Royal Astronomical Society 502, no. 2 (2021): 2934–51. http://dx.doi.org/10.1093/mnras/stab255.

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ABSTRACT The existence of hot, accreted gaseous coronae around massive galaxies is a long-standing central prediction of galaxy formation models in the ΛCDM cosmology. While observations now confirm that extraplanar hot gas is present around late-type galaxies, the origin of the gas is uncertain with suggestions that galactic feedback could be the dominant source of energy powering the emission. We investigate the origin and X-ray properties of the hot gas that surrounds galaxies of halo mass, $(10^{11}\!-\!10^{14}) \, \mathrm{M}_\odot$, in the cosmological hydrodynamical eagle simulations. We

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Gargiulo, Ignacio D., Antonela Monachesi, Facundo A. Gómez, et al. "The prevalence of pseudo-bulges in the Auriga simulations." Monthly Notices of the Royal Astronomical Society 489, no. 4 (2019): 5742–63. http://dx.doi.org/10.1093/mnras/stz2536.

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ABSTRACT We study the galactic bulges in the Auriga simulations, a suite of 30 cosmological magneto-hydrodynamical zoom-in simulations of late-type galaxies in Milky Way sized dark matter haloes performed with the moving-mesh code arepo. We aim to characterize bulge formation mechanisms in this large suite of galaxies simulated at high resolution in a fully cosmological context. The bulges of the Auriga galaxies show a large variety in their shapes, sizes, and formation histories. According to observational classification criteria, such as Sérsic index and degree of ordered rotation, the major

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13

ZENTNER, ANDREW R. "THE EXCURSION SET THEORY OF HALO MASS FUNCTIONS, HALO CLUSTERING, AND HALO GROWTH." International Journal of Modern Physics D 16, no. 05 (2007): 763–815. http://dx.doi.org/10.1142/s0218271807010511.

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I review the excursion set theory with particular attention toward applications to cold dark matter halo formation and growth, halo abundance, and halo clustering. After a brief introduction to notation and conventions, I begin by recounting the heuristic argument leading to the mass function of bound objects given by Press and Schechter. I then review the more formal derivation of the Press–Schechter halo mass function that makes use of excursion sets of the density field. The excursion set formalism is powerful and can be applied to numerous other problems. I review the excursion set formali

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14

Li, Ying, Zengxue Li, Huaihong Wang, and Dongdong Wang. "The characteristics of hydrocarbon generation, reserving performances of fine-grained rock, and preservation conditions of coal measure shale gas of an epicontinental sea basin: A case study of the Late Palaeozoic shale gas in the Huanghebei Area of Western Shandong." Energy Exploration & Exploitation 37, no. 1 (2018): 453–72. http://dx.doi.org/10.1177/0144598718804925.

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In China, marine and land transitional fine-grained rocks (shale, mudstone, and so on) are widely distributed and are known to have large accumulated thicknesses. However, shale gas explorations of these types of rock have only recently been initiated, thus the research degree is very low. Therefore, this study was conducted in order to improve the research data regarding the gas accumulation theory of marine and continental transitional fine-grained rock, as well as investigate the shale gas generation potential in the Late Paleozoic fine-grained rock masses located in the Huanghebei Area of

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15

Das, Subinoy, and Neal Weiner. "Late forming dark matter in theories of neutrino dark energy." Physical Review D 84, no. 12 (2011). http://dx.doi.org/10.1103/physrevd.84.123511.

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16

Agarwal, S., P. S. Corasaniti, S. Das, and Y. Rasera. "Small scale clustering of late forming dark matter." Physical Review D 92, no. 6 (2015). http://dx.doi.org/10.1103/physrevd.92.063502.

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17

McCarthy, Kevin S., Zheng Zheng, Hong Guo, Wentao Luo, and Yen-Ting Lin. "On the Constraints of Galaxy Assembly Bias in Velocity Space." Monthly Notices of the Royal Astronomical Society, September 13, 2021. http://dx.doi.org/10.1093/mnras/stab2602.

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Abstract If the formation of central galaxies in dark matter haloes traces the assembly history of their host haloes, in haloes of fixed mass, central galaxy clustering may show dependence on properties indicating their formation history. Such a galaxy assembly bias effect has been investigated by Lin et al. (2016), with samples of central galaxies constructed in haloes of similar mass and with mean halo mass verified by galaxy lensing measurements, and no significant evidence of assembly bias is found from the analysis of the projected two-point correlation functions of early- and late-formin

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18

Collins, Michelle L. M., Benjamin F. Williams, Erik J. Tollerud, Eduardo Balbinot, Karoline M. Gilbert, and Andrew Dolphin. "A detailed star formation history for the extremely diffuse Andromeda XIX dwarf galaxy." Monthly Notices of the Royal Astronomical Society, September 30, 2022. http://dx.doi.org/10.1093/mnras/stac2794.

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Abstract We present deep imaging of the ultra-diffuse Andromeda XIX dwarf galaxy from the Advance Camera for Surveys on the Hubble Space Telescope which resolves its stellar populations to below the oldest main sequence turn-off. We derive a full star formation history for the galaxy using MATCH, and find no evidence of star formation in the past 8 Gyr. We calculate a quenching time of τ90 = 9.7 ± 0.2 Gyr, suggesting Andromeda XIX ceased forming stars very early on. This early quenching, combined with its extremely large half-light radius, low density dark matter halo and lower than expected m

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19

O’Leary, Joseph A., Ulrich P. Steinwandel, Benjamin P. Moster, Nicolas Martin, and Thorsten Naab. "Predictions on the stellar-to-halo mass relation in the dwarf regime using the empirical model for galaxy formation Emerge." Monthly Notices of the Royal Astronomical Society, January 17, 2023. http://dx.doi.org/10.1093/mnras/stad166.

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Abstract One of the primary goals when studying galaxy formation is to understand how the luminous component of the Universe, galaxies, relates to the growth of structure which is dominated by the gravitational collapse of dark matter haloes. The stellar-to-halo mass relation probes how galaxies occupy dark matter haloes and what that entails for their star formation history. We deliver the first self-consistent empirical model that can place constraints on the stellar-to-halo mass relation down to log stellar mass log10(m*/M⊙) ≤ 5.0 by fitting our model directly to Local Group dwarf data. Thi

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20

Marini, I., S. Borgani, A. Saro, et al. "Velocity dispersion of brightest cluster galaxies in cosmological simulations." Monthly Notices of the Royal Astronomical Society, September 7, 2021. http://dx.doi.org/10.1093/mnras/stab2518.

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Abstract Using the DIANOGA hydrodynamical zoom-in simulation set of galaxy clusters, we analyze the dynamics traced by stars belonging to the Brightest Cluster Galaxies (BCGs) and their surrounding diffuse component, forming the intracluster light (ICL), and compare it to the dynamics traced by dark matter and galaxies identified in the simulations. We compute scaling relations between the BCG and cluster velocity dispersions and their corresponding masses (i.e. $M_\mathrm{BCG}^{\star }$– $\sigma _\mathrm{BCG}^{\star }$, M200– σ200, $M_\mathrm{BCG}^{\star }$– M200, $\sigma _\mathrm{BCG}^{\star

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21

Zagatti, G., E. Calabrese, C. Chiocchetta, M. Gerbino, M. Negrello, and L. Pagano. "A halo model approach to describe clustering and emission of the two main star-forming galaxy populations for cosmic infrared background studies." Astronomy & Astrophysics, November 8, 2024. http://dx.doi.org/10.1051/0004-6361/202451424.

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The cosmic infrared background (CIB), which is traced by the emission from dusty star-forming galaxies, provides a crucial window into the phases of star formation throughout cosmic history. These galaxies, although challenging to detect individually at high redshifts due to their faintness, cumulatively contribute to the CIB, which then becomes a powerful probe of galaxy formation, evolution, and clustering. Here, we introduce a physically motivated model for the CIB emission spanning a wide range of frequency and angular resolution, employing a halo model approach, and distinguishing, within

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22

Tan, Victoria, and Shyamal Mitra. "Disputing the green valley theory of galaxy evolution." Journal of Emerging Investigators, 2025. https://doi.org/10.59720/23-172.

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Fully understanding the process of galaxy evolution has long been a conundrum in astronomical research, given the limited amount of precise observational data and the complexity of processing the many factors that lead to the development of a galaxy. These include a galaxy’s many shapes or morphologies, the presence of dark matter, the interactions between galaxies, and the distance at which galaxies can be observed. A crossroad in elucidating galaxy evolution—where star-forming “blue” galaxies transition to quiescent “red” galaxies—exists between the green valley and red-herring hypotheses. T

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23

Caldwell, Tracy M. "Identity Making from Soap to Nuts." M/C Journal 6, no. 1 (2003). http://dx.doi.org/10.5204/mcj.2149.

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The release of the film Fight Club (Dir. David Fincher, 1999) was met with an outpouring of contradictory reviews. From David Ansen’s [Newsweek] claim that “Fight Club is the most incendiary movie to come out of Hollywood in a long time” (Fight Club DVD insert) to LA Times’s Kenneth Turan who proclaimed Fight Club to be “…a witless mishmash of whiny, infantile philosophising and bone-crushing violence that actually thinks it’s saying something of significance” (Fight Club DVD insert), everyone, it seemed, needed to weigh in with their views. Whether you think the film is a piece of witless and

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24

Wise, Nathan, and Lisa J. Hackett. "The Inculcative Power of Australian Cadet Corps Uniforms in the 1900s and 1910s." M/C Journal 26, no. 1 (2023). http://dx.doi.org/10.5204/mcj.2972.

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The 1900s and 1910s were a prime era for the growth and empowerment of cadet corps within Australia. Private schools in particular sought to build on a newfound spirit of nationalism following the Federation of the colonies in 1901 by harnessing enthusiasm for the nation and British Empire, and by cultivating a martial culture among their predominantly middle-class students. The principal tool harnessed in that cultivation were the school cadet corps, and the most visible symbol of those corps were their uniforms. By focussing on the cadet corps in the private schools of Sydney during this era

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