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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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Signatures of stellar accretion in MaNGA early-type galaxies
AU - Oyarzun, Grecco A.
AU - Bundy, Kevin
AU - Westfall, Kyle B.
AU - Belfiore, Francesco
AU - Thomas, Daniel
AU - Maraston, Claudia
AU - Lian, Jianhui
AU - Aragon-Salamanca, Alfonso
AU - Zheng, Zheng
AU - Gonzalez-Perez, Violeta
AU - Law, David R.
AU - Drory, Niv
AU - Andrews, Brett H.
N1 - 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.
PY - 2019/7/31
Y1 - 2019/7/31
N2 - 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.
AB - 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.
KW - astro-ph.GA
KW - astro-ph.CO
U2 - 10.3847/1538-4357/ab297c
DO - 10.3847/1538-4357/ab297c
M3 - Journal article
VL - 880
JO - The Astrophysical Journal
JF - The Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 111
ER -