Thematische Bibliographien / AGN activity

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Auswahl der wissenschaftlichen Literatur zum Thema „AGN activity“

Autor: Grafiati

Veröffentlicht am 26. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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Zeitschriftenartikel zum Thema "AGN activity"

Amiri, Amirnezam. "Role of environment on AGN activity." Proceedings of the International Astronomical Union 15, S356 (2019): 171. http://dx.doi.org/10.1017/s1743921320002835.

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AbstractMotivated by the apparently conflicting results reported in the literature on the effect of environment on nuclear activity, we have carried out a new analysis by comparing the fraction of galaxies hosting active galactic nuclei (AGNs) in the most overdense regions (rich galaxy clusters) and the most underdense ones (voids) in the local universe. Exploiting the classical BPT diagnostics, we have extracted volume limited samples of star forming and AGN galaxies. We find that, at variance with star-forming galaxies, AGN galaxies have similar distributions of specific star formation rates

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Li, Cheng, Guinevere Kauffmann, Timothy M. Heckman, Simon D. M. White, and Y. P. Jing. "Interactions, star formation and AGN activity." Monthly Notices of the Royal Astronomical Society 385, no. 4 (2008): 1915–22. http://dx.doi.org/10.1111/j.1365-2966.2008.13023.x.

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Umemura, Masayuki, Jun Fukue, and Shin Mineshige. "AGN activity triggered by circumnuclear starbursts." Advances in Space Research 23, no. 5-6 (1999): 1095–100. http://dx.doi.org/10.1016/s0273-1177(99)00238-0.

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Man, Zhong-yi, Ying-jie Peng, Xu Kong, Ke-xin Guo, Cheng-peng Zhang, and Jing Dou. "The dependence of AGN activity on environment in SDSS." Monthly Notices of the Royal Astronomical Society 488, no. 1 (2019): 89–98. http://dx.doi.org/10.1093/mnras/stz1706.

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ABSTRACT Environment is one of the key external drivers of the galaxies, while active galactic nucleus (AGN) is one of the key internal drivers. Both of them play fundamental roles in regulating the formation and evolution of galaxies. We explore the interrelationship between environment and AGN in SDSS. At a given stellar mass, the specific star formation rate distribution of the AGN host galaxies remains unchanged with overdensity, with the peak of the distribution around the Green Valley. We show that, at a given stellar mass, the AGN fraction that has been commonly used in previous studies

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Noordeh, E., R. E. A. Canning, A. King, et al. "The environmental dependence of X-ray AGN activity at z ∼ 0.4." Monthly Notices of the Royal Astronomical Society 498, no. 3 (2020): 4095–108. http://dx.doi.org/10.1093/mnras/staa2682.

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ABSTRACT We present an analysis of the X-ray active galactic nucleus (AGN) population in a sample of seven massive galaxy clusters in the redshift range 0.35 &lt; z &lt; 0.45. We utilize high-quality Chandra X-ray imaging to robustly identify AGN and precisely determine cluster masses and centroids. Follow-up VIsible Multi-Object Spectrograph optical spectroscopy allows us to determine which AGN are cluster members. Studying the subset of AGN with 0.5–8 keV luminosities &gt;6.8 × 1042 erg s−1, within r ≤ 2r500 (approximately the virial radius), we find that the cluster AGN space de

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Martín-Navarro, Ignacio, Francesco Shankar, and Mar Mezcua. "Rejuvenation triggers nuclear activity in nearby galaxies." Monthly Notices of the Royal Astronomical Society: Letters 513, no. 1 (2021): L10—L14. http://dx.doi.org/10.1093/mnrasl/slab112.

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ABSTRACT Feedback, in particular from active galactic nuclei (AGNs), is believed to play a crucial role in the evolution of galaxies. In the local Universe, many galaxies with an AGN are indeed observed to reside in the so-called green valley, usually interpreted as a transition phase from a blue star-forming to a red quenched state. We use data from the Sloan Digital Sky Survey to show that such an interpretation requires substantial revision. Optically selected nearby AGN galaxies follow exponentially declining star formation histories, as normal galaxies of similar stellar and dark matter h

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González Delgado, R. M., C. N. Tadhunter, E. Pérez, M. Villar-Martín, J. Holt, and J. Rodríguez. "The relation between mergers and AGN activity." Astronomische Nachrichten 327, no. 2-3 (2006): 159–66. http://dx.doi.org/10.1002/asna.200510499.

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De Rosa, A., S. Bianchi, T. Bogdanović, et al. "Unveiling multiple AGN activity in galaxy mergers." Astronomische Nachrichten 338, no. 2-3 (2017): 262–68. http://dx.doi.org/10.1002/asna.201713340.

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Somboonpanyakul, T., M. McDonald, A. Noble, et al. "The Evolution of AGN Activity in Brightest Cluster Galaxies." Astronomical Journal 163, no. 4 (2022): 146. http://dx.doi.org/10.3847/1538-3881/ac5030.

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Abstract We present the results of an analysis of Wide-field Infrared Survey Explorer (WISE) observations of the full 2500 deg2 South Pole Telescope (SPT)-Sunyaev–Zel’dovich cluster sample. We describe a process for identifying active galactic nuclei (AGN) in brightest cluster galaxies (BCGs) based on WISE mid-IR color and redshift. Applying this technique to the BCGs of the SPT-SZ sample, we calculate the AGN-hosting BCG fraction, which is defined as the fraction of BCGs hosting bright central AGNs over all possible BCGs. Assuming an evolving single-burst stellar population model, we find sta

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Kristensen, Mikkel Theiss, Kevin A. Pimbblet, Brad K. Gibson, Samantha J. Penny, and Sophie Koudmani. "Merger Histories and Environments of Dwarf AGN in IllustrisTNG." Astrophysical Journal 922, no. 2 (2021): 127. http://dx.doi.org/10.3847/1538-4357/ac236d.

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Abstract The relationship between active galactic nuclei (AGN) activity and environment has been long discussed, but it is unclear if these relations extend into the dwarf galaxy mass regime—in part due to the limits in both observations and simulations. We aim to investigate if the merger histories and environments are significantly different between AGN and non-AGN dwarf galaxies in cosmological simulations, which may be indicative of the importance of these for AGN activity in dwarf galaxies, and whether these results are in line with observations. Using the IllustrisTNG flagship TNG100-1 r

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Dissertationen zum Thema "AGN activity"

Blank, Marvin, and Wolfgang J. Duschl. "Viscous time lags between starburst and AGN activity." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621734.

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There is strong observational evidence indicating a time lag of order of some 100 Myr between the onset of starburst and AGN activity in galaxies. Dynamical time lags have been invoked to explain this. We extend this approach by introducing a viscous time lag the gas additionally needs to flow through the AGN's accretion disc before it reaches the central black hole. Our calculations reproduce the observed time lags and are in accordance with the observed correlation between black hole mass and stellar velocity dispersion.

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Molnár, Dániel Csaba. "Tracing star formation and AGN activity at radio frequencies." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79453/.

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My research has focused on locating and measuring star formation and AGN activity in different environments with interferometric and single-dish radio observations. As my first PhD project, I studied the complex interaction between an intermediate redshift (z 0.3) starburst galaxy and a nearby ( 7 kpc separation) QSO using sub-arcsecond VLA observations. I found new evidence for jet-induced star formation activity in the companion galaxy, making the system a strong candidate for this rare, and potentially important process in the early Universe. In my second paper, I investigated the infrared-

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Laporte, Nicolas, Kimihiko Nakajima, Richard S. Ellis, et al. "A Spectroscopic Search for AGN Activity in the Reionization Era." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626417.

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The ubiquity of Lyman alpha (Ly alpha) emission in a sample of four bright [O III]- strong star-forming galaxies with redshifts above seven has led to the suggestion that such luminous sources represent a distinct population compared with their fainter, more numerous counterparts. The presence of Lya emission within the reionization era could indicate that these sources created early ionized bubbles due to their unusually strong radiation, possibly because of the presence of active galactic nuclei. To test this hypothesis, we secured long integration spectra with XSHOOTER on the VLT for three

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Omma, Henrik Nilsen. "Jet-powered cooling cores : reversing cooling flows through AGN activity." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419330.

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Salvestrini, Francesco <1991&gt. "The impact of AGN activity on the host-galaxy ISM." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9830/3/salvestrini_phd_thesis.pdf.

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In this Thesis I investigate how, and to which extent, Active Galactic Nuclei (AGN) activity affects the properties of the host-galaxy interstellar medium (ISM). AGN are thought to regulate the host star formation (SF) by injecting large amount of energy in the circumnuclear region, either suppressing or enhancing the formation of new stars. To understand the interplay between AGN and SF multi-wavelength approach is needed, which allows us to trace the different gas components. In the first part of the Thesis, I present the result of a systematic analysis of the X-ray properties of a sample o

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Kolwa, Sthabile. "The effects of environment on radio-loud AGN activity in Stripe 82." University of the Western Cape, 2016. http://hdl.handle.net/11394/5318.

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>Magister Scientiae - MSc<br>We investigate the link between environment and radiative accretion efficiency using a sample of 8946 radio-loud AGN detected at 1 − 2 GHz in the SDSS Stripe 82 region. We quantify their environments using the surface-density parameter, ƩN, which measures galaxy density based on distances to Nth nearest neighbours. Comparing Ʃ2 and Ʃ5 between AGN and control galaxies, we obtain relative densities that quantify the degree of galaxy clustering around each AGN. Using this, we examine the relation between density and the HERG-LERG dichotomy (accretion-modes) classified

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Ma, Jingzhe, Anthony H. Gonzalez, J. D. Vieira, et al. "SPT0346-52: NEGLIGIBLE AGN ACTIVITY IN A COMPACT, HYPER-STARBURST GALAXY AT z = 5.7." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622449.

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We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (similar to 4500 M-circle dot yr(-1)) and SFR surface density Sigma(SFR) (similar to 2000 M-circle dot y

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Noirot, Gaël. "The CARLA-Hubble survey : spectroscopic confirmation and galaxy stellar activity of rich structures at 1.4 < z < 2.8." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC153.

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Les études détaillées d'amas de galaxies confirmés à grands redshifts sont peu nombreuses. L’objectif de cette Thèse est d’établir le premier catalogue d'amas confirmés spectroscopiquement à grand redshift et, pour la première fois à ces redshifts, d’étudier de manière statistique les propriétés des galaxies membres des amas. Dans cette Thèse, nous caractérisons et étudions 20 candidats amas à redshifts 1.4 < z < 2.8 parmi les candidats les plus prometteurs de l’échantillon CARLA. Nous réduisons et analysons des données spectroscopiques grism sans fente et imagerie proche-infrarouge des

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Alberts, Stacey, Alexandra Pope, Mark Brodwin, et al. "STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL /PACS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621395.

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We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (greater than or similar to 10(14)M(circle dot)) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy distributions (SEDs) for IR-luminous cluster galaxies, finding that they can, on average, be well described by field galaxy templates. Identification and decomposition of AGNs through SED fittings allows us to include the contribution to clust

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Zaheer, Farah. "Adaptations in motor unit activity with age and physical activity." Thesis, Boston University, 2012. https://hdl.handle.net/2144/12693.

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Thesis (Sc.D.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>The hypothesis that age-related alterations to the morphological properties of a motor unit (MU) are accompanied by modifications in their control properties has been supported by data that compared young (24-3

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Bücher zum Thema "AGN activity"

Click, Phyllis. Caring for school-age children. 4th ed. Thomson Delmar Learning, 2006.

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Click, Phyllis. Caring for school age children. 4th ed. Thomson Delmar Learning, 2005.

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Sitnova, Irina, Vladimir Yadov, and Svetlana Kirdina-Chendler. Institutional changes in modern Russia: activist-activity approach. INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1871442.

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Dissatisfaction with societal structuralist approaches with culturological determinism characteristic of them resulted in another crisis of modern sociology. Traditional sociology ignored a person capable of making individual decisions and making informed choices, and in traditional economic theory this person hung in an airless space in the absence of supportive social structures. Sociologists began to show interest in what is happening in neo-institutional economic theory, and, moreover, intensively borrow its conceptual apparatus. Attempts to resolve the crisis are demonstrated today

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Billington, Rachel. A woman's age. Pan, 1996.

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Shephard, Roy J. Physical activity and aging. 2nd ed. Croom Helm, 1987.

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Blakley, Barbara. Activities for school-age child care: Playing and learning. National Association for the Education of Young Children, 1989.

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Freedman, B., and B. J. Freedman. A Natural Lizard Activity. Smashwords, 2010.

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Marga, Klompé, and Plas, Michel van der, 1927-, eds. Herinneringen aan Marga Klompé. Arbor, 1989.

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Canada. Library of Parliament. Parliamentary Research Branch. Canada's legal age of consent to sexual activity. Library of Parliament, 1999.

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Hubler Ed.S., Michael S, Hubler CDA, Lillian I. School Age Activity Guide. CreateSpace Independent Publishing Platform, 2013.

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Buchteile zum Thema "AGN activity"

Stasinska, Grazyna. "Statistical Studies of AGN and QSOs." In Observational Evidence of Activity in Galaxies. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3851-9_22.

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Chatterjee, Tapan K. "Nuclear Activity in Interacting Galaxies." In Multi-Wavelength Continuum Emission of AGN. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_197.

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Márquez, Isabel, and Josefa Masegosa. "Galaxies Hosting AGN Activity and Their Environments." In Astrophysics and Space Science Proceedings. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11250-8_11.

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Kontorovich, V. M., A. V. Kats, and D. S. Krivitsky. "Activity as the Result of Merging." In Multi-Wavelength Continuum Emission of AGN. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_209.

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Omori, Kiyoaki Christopher. "The Impact of Galaxy Mergers on AGN Activity." In Springer Theses. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-8735-7_4.

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Schalinski, C. J., P. Biermann, A. Eckart, K. J. Johnston, T. Ph Krichbaum, and A. Witzel. "Bulk Relativistic Motion in a Complete Sample of Radio Selected AGN." In Observational Evidence of Activity in Galaxies. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3851-9_41.

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Hjelm, M., P. O. Lindblad, and S. Jörsäter. "Nuclear Activity in the Seyfert Galaxy NGC 1365." In Multi-Wavelength Continuum Emission of AGN. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_154.

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Storchi-Bergmann, Thaisa, Andrew S. Wilson, and Jack A. Baldwin. "Star-Formation and Nuclear Activity in Three Galaxies with Nuclear Rings." In Multi-Wavelength Continuum Emission of AGN. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_166.

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Magdziarz, P., and J. Machalski. "Time Scale of Radio Sources Activity from the Statistical Model of Variability." In Multi-Wavelength Continuum Emission of AGN. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_112.

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Harrison, Christopher Mark. "Energetic Galaxy-Wide Outflows in High-z ULIRGs Hosting AGN Activity." In Observational Constraints on the Influence of Active Galactic Nuclei on the Evolution of Galaxies. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28454-5_3.

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Konferenzberichte zum Thema "AGN activity"

Magliocchetti, Manuela, Dieter Lutz, Paola Santini, et al. "Is there any feedback between AGN and star-forming activity in radio-selected AGN?" In The many facets of extragalactic radio surveys: towards new scientific challenges. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.267.0056.

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JOHNSON, O., P. BEST, and O. ALMAINI. "AGN ACTIVITY IN HIGH REDSHIFT CLUSTERS AND PROTOCLUSTERS." In Proceedings of the Guillermo Haro Conference 2003. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702432_0103.

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Teräsranta, Harri. "The burst activity of millimeter wavelengths compared to gamma-activity of AGN." In The fourth compton symposium. AIP, 1997. http://dx.doi.org/10.1063/1.53958.

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Smolcic, Vernesa, Paolo Padovani, Jacinta Delhaize, et al. "Exploring AGN Activity over Cosmic Time with the SKA." In Advancing Astrophysics with the Square Kilometre Array. Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.215.0069.

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Šimon, V. "Activity of the dwarf nova CH UMa." In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434781.

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Mancuso, Claudia, Matteo Bonato, Andrea Lapi, Gianfranco De Zotti, and Luigi Danese. "Modeling star formation and AGN activity in sub-mJy radio surveys." In The many facets of extragalactic radio surveys: towards new scientific challenges. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.267.0054.

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de Gouveia Dal Pino, Elisabete. "3D MHD Simulations of the Central Region of the Perseus Galaxy Cluster: the Role of Starburst and AGN Activity and Particle Acceleration by Magnetic Reconnection." In AGN Physics in the CTA Era. Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.141.0031.

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Šimon, V. "Color variations during activity states of the binary V Sge." In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434780.

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Boller, Th. "Narrow-line Seyfert 1 galaxies as an extreme of Seyfert activity." In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434616.

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Alonso-Herrero, Almudena. "AGN and star formation activity in local luminous and ultraluminous infrared galaxies (review)." In Nuclei of Seyfert galaxies and QSOs - Central engine & conditions of star formation. Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.169.0043.

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Berichte der Organisationen zum Thema "AGN activity"

Schwartzstein, Joshua, and Andrei Shleifer. An Activity-Generating Theory of Regulation. National Bureau of Economic Research, 2009. http://dx.doi.org/10.3386/w14752.

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Munroe, Donna. Crime as a routine activity : an investigation. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.3271.

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Casey, Meghan, Danielle Wagstaff, Joanne Porter, and Rochelle Eime. Improving women’s physical activity in the City of Casey: Breaking down barriers using co-design and participatory research. Evaluation Report to the City of Casey, March 2024. Federation University, 2024. http://dx.doi.org/10.35843/ccbdber24.

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This research project actively engaged women to design physical activity programs in the City of Casey and provided knowledge to inform council decision-making and investment in community physical activity. Initally, four workshops were conducted with women (n=76) from culturally diverse backgrounds in the City of Casey to investigate the barriers they faced participating in physical activity and they co-designed solutions to improve participation. These women were also invited to complete a survey on their demographics, health, physical activity and barriers, to inform the design of physical

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Gertler, Mark. Financial Structure and Aggregate Economic Activity: An Overview. National Bureau of Economic Research, 1988. http://dx.doi.org/10.3386/w2559.

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Lee, Jason S., Richard I. Ray, Brenda J. Little, Daniel R. DeMarco, and Michael H. Dorsey. An Evaluation of an Inline Sensor for Detection of Microbial Activity. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada430220.

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Grafi, Gideon, and Brian Larkins. Endoreduplication in Maize Endosperm: An Approach for Increasing Crop Productivity. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7575285.bard.

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The focus of this research project is to investigate the role of endoreduplication in maize endosperm development and the extent to which this process contributes to high levels of starch and storage protein synthesis. Although endoreduplication has been widely observed in many cells and tissues, especially those with high levels of metabolic activity, the molecular mechanisms through which the cell cycle is altered to produce consecutive cycles of S-phase without an intervening M-phase are unknown. Our previous research has shown that changes in the expression of several cell cycle regulatory

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Zakharova L.M., Zakharova V.S. Physical Activity Influence on Cognitive Development of Late Pre-School Age Children. Povolzhskaya State Academy of Physical Culture of Sports and Tourism, 2017. http://dx.doi.org/10.14526/03_2017_244.

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Goldschlag, Nathan, Julia Lane, Bruce Weinberg, and Nikolas Zolas. Proximity and Economic Activity: An Analysis of Vendor‐University Transactions. National Bureau of Economic Research, 2017. http://dx.doi.org/10.3386/w23018.

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Verch, Richard L. Nongame Breeding Bird Activity in an Intensively Cultured Populus Plantation. U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1986. http://dx.doi.org/10.2737/nc-rn-336.

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Evenson, Kelly R., Ty A. Ridenour, Jacqueline Bagwell, and Robert D. Furberg. Sustaining Physical Activity Following Cardiac Rehabilitation Discharge. RTI Press, 2021. http://dx.doi.org/10.3768/rtipress.2021.rr.0043.2102.

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Because many patients reduce exercise following outpatient cardiac rehabilitation (CR), we developed an intervention to assist with the transition and evaluated its feasibility and preliminary efficacy using a one-group pretest–posttest design. Five CR patients were enrolled ~1 month prior to CR discharge and provided an activity tracker. Each week during CR they received a summary of their physical activity and steps. Following CR discharge, participants received an individualized report that included their physical activity and step history, information on specific features of the activity t

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