The MASSIVE Survey. XII. Connecting Stellar Populations of Early-type Galaxies to Kinematics and Environment
Year: 2019
Type: article
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 (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.
Source: The Astrophysical Journal
Authors: Jenny E. Greene, Melanie Veale, Chung-Pei Ma, Jens Thomas, Matthew E. Quenneville, John P. Blakeslee, Jonelle L. Walsh, Andrew Goulding, Jennifer Ito
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: National Science Foundation
Awards: Collaborative Research: MASSIVE - A Survey of the 100 Most Massive Galaxies within 100 Mpc, Collaborative Research: From Dark Matter Halos to Supermassive Black Holes in the Most Massive Galaxies, Collaborative Research: From Dark Matter Halos to Supermassive Black Holes in the Most Massive Galaxies, Collaborative Research: MASSIVE - A Survey of the 100 Most Massive Galaxies within 100 Mpc
OpenAlex ID: W2907500561