Signatures of stellar accretion in MaNGA early-type galaxies

Oyarzun, Grecco A. and Bundy, Kevin and Westfall, Kyle B. and Belfiore, Francesco and Thomas, Daniel and Maraston, Claudia and Lian, Jianhui and Aragon-Salamanca, Alfonso and Zheng, Zheng and Gonzalez-Perez, Violeta and Law, David R. and Drory, Niv and Andrews, Brett H. (2019) Signatures of stellar accretion in MaNGA early-type galaxies. The Astrophysical Journal, 880 (2). ISSN 0004-637X

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The late assembly of massive galaxies is thought to be dominated by stellar accretion in their outskirts (beyond 2 effective radii Re) due to dry, minor galaxy mergers. We use observations of 1010 passive early-type galaxies (ETGs) within z10^{11}Msun ETGs. This is a signature of stellar accretion. Based on a toy model for stellar metallicity profiles, we infer the ex-situ stellar mass fraction in ETGs as a function of M and galactocentric radius. We find that ex-situ stars at 2Re make up 20% of the projected stellar mass of M10^{11.5}Msun ETGs.

Item Type:
Journal Article
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The Astrophysical Journal
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This is an author-created, un-copyedited version of an article accepted for publication/published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4357/ab297c.
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22 Jun 2019 09:18
Last Modified:
22 Nov 2022 07:39