Group quenching and galactic conformity at low redshift
| Autor: | Joss Bland-Hawthorn, Clotilde Laigle, B. Milliard, S. de la Torre, A. H. Wright, Marie Treyer, D. Vibert, Christophe Pichon, Jochen Liske, Maritza A. Lara-López, Mark Seibert, Yohan Dubois, Meiert W. Grootes, Michael J. I. Brown, K. Kraljic, Stéphane Arnouts |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Stellar mass [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences surveys galaxies: groups: general 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics galaxies: statistics Astrophysics::Galaxy Astrophysics Quenching Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) galaxies: star formation Mass relation Halo galaxies: evolution Low Mass Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | CIÊNCIAVITAE Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2018, 477 (2), pp.2684-2704. ⟨10.1093/mnras/sty769⟩ NASA Astrophysics Data System Monthly Notices of the Royal Astronomical Society, 2018, 477 (2), pp.2684-2704. ⟨10.1093/mnras/sty769⟩ |
| ISSN: | 0035-8711 1365-2966 |
| Popis: | We quantify the quenching impact of the group environment using the spectroscopic survey Galaxy and Mass Assembly (GAMA) to z=0.2. The fraction of red (quiescent) galaxies, whether in groups or isolated, increases with both stellar mass and large-scale (5 Mpc) density. At fixed stellar mass, the red fraction is on average higher for satellites of red centrals than of blue (star-forming) centrals, a galactic conformity effect that increases with density. Most of the signal originates from groups that have the highest stellar mass, reside in the densest environments, and have massive, red only centrals. Assuming a color-dependent halo-to-stellar-mass ratio, whereby red central galaxies inhabit significantly more massive halos than blue ones of the same stellar mass, two regimes emerge more distinctly: at log(Mhalo/Msol) < 13, central quenching is still ongoing, conformity is no longer existent, and satellites and group centrals exhibit the same quenching excess over field galaxies at all mass and density, in agreement with the concept of "group quenching"; at log(Mhalo/Msol) > 13, a cutoff that sets apart massive (log(M*/Msol) > 11), fully quenched group centrals, conformity is meaningless, and satellites undergo significantly more quenching than their counterparts in smaller halos. The latter effect strongly increases with density, giving rise to the density-dependent conformity signal when both regimes are mixed. The star-formation of blue satellites in massive halos is also suppressed compared to blue field galaxies, while blue group centrals and the majority of blue satellites, which reside in low mass halos, show no deviation from the color-stellar mass relation of blue field galaxies. 23 pages, 22 figures, published version with changes to text and figures (results unchanged) |
| Databáze: | OpenAIRE |
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