TY - JOUR
T1 - The MASSIVE Survey. XII. Connecting Stellar Populations of Early-type Galaxies to Kinematics and Environment
AU - Greene, Jenny E.
AU - Veale, Melanie
AU - Ma, Chung Pei
AU - Thomas, Jens
AU - Quenneville, Matthew E.
AU - Blakeslee, John P.
AU - Walsh, Jonelle L.
AU - Goulding, Andrew
AU - Ito, Jennifer
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019/3/20
Y1 - 2019/3/20
N2 - We measure the stellar populations as a function of the radius for 90 early-type galaxies (ETGs) in the MASSIVE survey, a volume-limited integral-field spectroscopic (IFS) galaxy survey targeting all northern-sky ETGs with an absolute K-band magnitude of M K ,F< ,F-25.3 mag or a stellar mass of , within 108 Mpc. We are able to measure reliable stellar population parameters for individual galaxies out to 10-20 kpc (1-3 R e ) depending on the galaxy. Focusing on ∼R e (∼10 kpc), we find significant correlations between the abundance ratios, σ, and at a large radius, but we also find that the abundance ratios saturate in the highest-mass bin. We see a strong correlation between the kurtosis of the line-of-sight velocity distribution (h4) and the stellar population parameters beyond R e . Galaxies with higher radial anisotropy appear to be older, with metal-poorer stars and enhanced [α/Fe]. We suggest that the higher radial anisotropy may derive from more accretion of small satellites. Finally, we see some evidence for correlations between environmental metrics (measured locally and on >5 Mpc scales) and the stellar populations, as expected if satellites are quenched earlier in denser environments.
AB - We measure the stellar populations as a function of the radius for 90 early-type galaxies (ETGs) in the MASSIVE survey, a volume-limited integral-field spectroscopic (IFS) galaxy survey targeting all northern-sky ETGs with an absolute K-band magnitude of M K ,F< ,F-25.3 mag or a stellar mass of , within 108 Mpc. We are able to measure reliable stellar population parameters for individual galaxies out to 10-20 kpc (1-3 R e ) depending on the galaxy. Focusing on ∼R e (∼10 kpc), we find significant correlations between the abundance ratios, σ, and at a large radius, but we also find that the abundance ratios saturate in the highest-mass bin. We see a strong correlation between the kurtosis of the line-of-sight velocity distribution (h4) and the stellar population parameters beyond R e . Galaxies with higher radial anisotropy appear to be older, with metal-poorer stars and enhanced [α/Fe]. We suggest that the higher radial anisotropy may derive from more accretion of small satellites. Finally, we see some evidence for correlations between environmental metrics (measured locally and on >5 Mpc scales) and the stellar populations, as expected if satellites are quenched earlier in denser environments.
KW - galaxies: elliptical and lenticular, cD
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: kinematics and dynamics
KW - galaxies: stellar content
UR - https://www.scopus.com/pages/publications/85064468800
UR - https://www.scopus.com/pages/publications/85064468800#tab=citedBy
U2 - 10.3847/1538-4357/ab01e3
DO - 10.3847/1538-4357/ab01e3
M3 - Article
AN - SCOPUS:85064468800
SN - 0004-637X
VL - 874
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 66
ER -