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

2019/01/04 by Jenny E Greene, Jenny E. Greene, Melanie Veale +7 · 41 citations
Engineering · Physics and Astronomy · #Accretion (finance) #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Galaxy #Population #RADIUS #Radial velocity #Space Technology and Applications #Stars #Stellar kinematics #Stellar mass #Stellar population #Velocity dispersion #astro-ph.GA

paper · pdf · doi:10.3847/1538-4357/ab01e3

published in The Astrophysical Journal 874(1), 66 (IOP Publishing) · 17 pages, 7 figures, Appendix not included here due to size constraints. Posted after responding to referee's comments

arxiv created 2019/01/04 · openalex created_date 2019/01/11 · openalex publication_date 2019/03/20 · arxiv updated 2019/04/03 · openalex updated_date 2026/08/05

Abstract

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 , 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 ( h 4) 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.

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