SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass
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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 3.5σ 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 > 4σ. 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.
Oyarzún , G A , Bundy , K , Westfall , K B , Tinker , J L , Belfiore , F , Argudo-Fernández , M , Zheng , Z , Conroy , C , Masters , K L , Wake , D , Law , D R , McDermid , R M , Aragón-Salamanca , A , Parikh , T , Yan , R , Bershady , M , Sánchez , S F , Andrews , B H , Fernández-Trincado , J G , Lane , R R , Bizyaev , D , Boardman , N F , Lacerna , I , Brownstein , J R , Drory , N & Zhang , K 2022 , ' SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass ' , Astrophysical Journal , vol. 933 , no. 1 , 88 . https://doi.org/10.3847/1538-4357/ac7048
Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
DescriptionFunding: G.O. acknowledges support from the Regents’ Fellowship from the University of California, Santa Cruz. K.B. was supported by the UC-MEXUS-CONACYT grant. J.G.F.-T. gratefully acknowledges the grant support provided by Proyecto Fondecyt Iniciación No. 11220340, as well as from ANID Concurso de Fomento a la Vinculación Internacional para Instituciones de Investigación Regionales (Modalidad corta duración) Proyecto No. FOVI210020 and from the Joint Committee ESO-Government of Chile 2021 (ORP 023/2021). M.A.F. acknowledges support by the FONDECYT iniciación project 11200107.
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