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The MASSIVE Survey. XII. Connecting Stellar Populations of Early-type Galaxies to Kinematics and Environment

Author(s): Greene, Jenny E.; Veale, Melanie; Ma, Chung-Pei; Thomas, Jens; Quenneville, Matthew E; et al

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Abstract: 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 < -25.3 mag or a stellar mass of M-* greater than or similar to 10(11) M-circle dot, 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 similar to R-e (similar to 10 kpc), we find significant correlations between the abundance ratios, sigma, and M-* 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 [alpha/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.
Publication Date: 20-Mar-2019
Electronic Publication Date: 22-Mar-2019
Citation: Greene, Jenny E, Veale, Melanie, Ma, Chung-Pei, Thomas, Jens, Quenneville, Matthew E, Blakeslee, John P, Walsh, Jonelle L, Goulding, Andrew, Ito, Jennifer. (2019). The MASSIVE Survey. XII. Connecting Stellar Populations of Early-type Galaxies to Kinematics and Environment. ASTROPHYSICAL JOURNAL, 874 (10.3847/1538-4357/ab01e3
DOI: doi:10.3847/1538-4357/ab01e3
ISSN: 0004-637X
EISSN: 1538-4357
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Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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