Grecco A. Oyarzun
SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass
Authors
Kevin Bundy
Kyle B. Westfall
Jeremy L. Tinker
Francesco Belfiore
Maria Argudo-Fernandez
Zheng Zheng
Charlie Conroy
Karen L. Masters
David Wake
David R. Law
Richard M. McDermid
Professor ALFONSO ARAGON-SALAMANCA ALFONSO.ARAGON@NOTTINGHAM.AC.UK
Professor of Astronomy
Taniya Parikh
Renbin Yan
Matthew Bershady
Sebastian F. Sanchez
Brett H. Andrews
Jose G.
Richard R. Lane
D. Bizyaev
Nicholas Fraser Boardman
Ivan Lacerna
J.R. Brownstein
Niv Drory
Kai Zhang
Abstract
We analyze spatially resolved and co-added SDSS-IV MaNGA spectra with signal-to-noise ratio ?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 and the widely used Yang et al. catalog. At fixed M*, the strengths of several stellar absorption features vary 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? 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 > 1012 h?1 M? with confidence >4?. 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.
Citation
Oyarzun, G. A., Bundy, K., Westfall, K. B., Tinker, J. L., Belfiore, F., Argudo-Fernandez, M., …Zhang, K. (2022). SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass. Astrophysical Journal, 933(1), Article 88. https://doi.org/10.3847/1538-4357/ac7048
Journal Article Type | Article |
---|---|
Acceptance Date | May 15, 2022 |
Online Publication Date | Jul 6, 2022 |
Publication Date | Jul 6, 2022 |
Deposit Date | May 30, 2022 |
Publicly Available Date | Jul 11, 2022 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 933 |
Issue | 1 |
Article Number | 88 |
DOI | https://doi.org/10.3847/1538-4357/ac7048 |
Keywords | Space and Planetary Science; Astronomy and Astrophysics |
Public URL | https://nottingham-repository.worktribe.com/output/8305432 |
Publisher URL | https://iopscience.iop.org/article/10.3847/1538-4357/ac7048 |
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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
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