SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass

Oyarzun, Grecco A.; Bundy, Kevin; Westfall, Kyle B.; Tinker, Jeremy L.; Belfiore, Francesco; Argudo-Fernandez, Maria; Zheng, Zheng; Conroy, Charlie; Masters, Karen L.; Wake, David; Law, David R.; McDermid, Richard M.; Aragon-Salamanca, Alfonso; Parikh, Taniya; Yan, Renbin; Bershady, Matthew; Sanchez, Sebastian F.; Andrews, Brett H.; Lane, Richard R.; Bizyaev, D.; Fraser Boardman, Nicholas; Lacerna, Ivan; Brownstein, J.R.; Drory, Niv; Zhang, Kai

doi:10.3847/1538-4357/ac7048

SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass

Authors

Grecco A. Oyarzun

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