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Signatures of stellar accretion in MaNGA early-type galaxies

Research output: Contribution to journalJournal article

Forthcoming
  • 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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<mark>Journal publication date</mark>12/06/2019
<mark>Journal</mark>The Astrophysical Journal
Publication statusAccepted/In press
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.