SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass
| Autor: | Grecco A. Oyarzún, Kevin Bundy, Kyle B. Westfall, Jeremy L. Tinker, Francesco Belfiore, Maria Argudo-Fernández, Zheng Zheng, Charlie Conroy, Karen L. Masters, David Wake, David R. Law, Richard M. McDermid, Alfonso Aragón-Salamanca, Taniya Parikh, Renbin Yan, Matthew Bershady, Sebastián F. Sánchez, Brett H. Andrews, José G. Fernández-Trincado, Richard R. Lane, D. Bizyaev, Nicholas Fraser Boardman, Ivan Lacerna, J. R. Brownstein, Niv Drory, Kai Zhang |
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| Přispěvatelé: | University of St Andrews. School of Physics and Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Galaxy dark matter halos
Cosmology and Nongalactic Astrophysics (astro-ph.CO) FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Galaxy properties Galaxy abundances Galaxy evolution QB Astronomy Elliptical galaxies QC Astrophysics::Galaxy Astrophysics QB Quenched galaxies Galaxy ages Astronomy and Astrophysics 3rd-DAS Galaxies Galaxy environments Astrophysics - Astrophysics of Galaxies Early-type galaxies Galaxy stellar content QC Physics Galaxy spectroscopy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | We analyze spatially resolved and co-added SDSS-IV MaNGA spectra with signal-to-noise ~100 from 2200 passive central galaxies (z~0.05) to understand how central galaxy assembly depends on stellar mass (M*) and halo mass (Mh). We control for systematic errors in Mh by employing a new group catalog from Tinker (2020a,b) and the widely-used Yang et al. (2007) catalog. At fixed M*, the strength of several stellar absorption features varies systematically with Mh. Completely model-free, this is one of the first indications that the stellar populations of centrals with identical M* are affected by the properties of their host halos. To interpret these variations, we applied full spectral fitting with the code alf. At fixed M*, centrals in more massive halos are older, show lower [Fe/H], and have higher [Mg/Fe] with 3.5 sigma confidence. We conclude that halos not only dictate how much M* galaxies assemble, but also modulate their chemical enrichment histories. Turning to our analysis at fixed Mh, high-M* centrals are older, show lower [Fe/H], and have higher [Mg/Fe] for Mh>10^{12}Msun/h with confidence > 4 sigma. While massive passive galaxies are thought to form early and rapidly, our results are among the first to distinguish these trends at fixed Mh. They suggest that high-M* centrals experienced unique early formation histories, either through enhanced collapse and gas fueling, or because their halos were early-forming and highly concentrated, a possible signal of galaxy assembly bias. Accepted for publication in ApJ. 28 pages and 12 figures |
| Databáze: | OpenAIRE |
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