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  • 1906.05298v1

    Rights statement: 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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Signatures of stellar accretion in MaNGA early-type galaxies

Research output: Contribution to journalJournal article

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  • Grecco A. Oyarzun
  • Kevin Bundy
  • Kyle B. Westfall
  • Francesco Belfiore
  • Daniel Thomas
  • Claudia Maraston
  • Jianhui Lian
  • Alfonso Aragon-Salamanca
  • Zheng Zheng
  • Violeta Gonzalez-Perez
  • David R. Law
  • Niv Drory
  • Brett H. Andrews
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Article number111
<mark>Journal publication date</mark>31/07/2019
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume880
Number of pages9
Publication statusPublished
Original languageEnglish

Abstract

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.

Bibliographic note

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.