Searching for environmental effects on galaxy kinematics in groups and clusters at z ∼ 1 from the ORELSE survey
Journal
Monthly Notices of the Royal Astronomical Society
Journal Volume
482
Journal Issue
3
Pages
3514-3549
Date Issued
2019
Author(s)
Pelliccia D
Lemaux B.C
Tomczak A.R
Lubin L.M
Shen L
Epinat B
Gal R.R
Rumbaugh N
Kocevski D.D
Tresse L
Squires G.
Abstract
We present an investigation of the dependence of galaxy kinematics on the environment for a sample of 94 star-forming galaxies at z ∼ 0.9 from the ORELSE survey. ORELSE is a large photometric and spectroscopic campaign dedicated to mapping out and characterizing galaxy properties across a full range of environments in 15 fields containing large-scale structures (LSSs) in a redshift range of 0.6 < z < 1.3. We constrained the rotation velocity for our kinematic sample in an ORELSE field, containing the SC1604 supercluster, by fitting high-resolution semi-analytical models to the data. We constructed the stellar-mass/B-band Tully-Fisher relation and found no dependence of the intrinsic scatter on both local and global environment. Moreover, we compared the stellar-to-dynamical mass ratio (M∗/Mdyn) of SC1604 galaxies to those residing in less dense local environment by leveraging data from the HR-COSMOS sample. We found that, at fixed stellar mass, SC1604 galaxies have ∼30 per cent smaller dynamical masses on average. By comparing the distributions of the galaxy parameters that define Mdyn (i.e., circular velocity and the characteristic radius r2.2) between SC1604 and HR-COSMOS, we found that smaller dynamical masses are mostly caused by smaller r2.2 for SC1604 galaxies. We also observed that SC1604 galaxies in general show ∼20 per cent lower stellar specific angular momentum (j∗) with respect to the HR-COSMOS sample. Adopting literature estimates for (1) the excess rate of galaxy-galaxy mergers in intermediate/high-density environments and (2) the average amount of j∗ loss per merger event, we investigated the possibility that galaxy mergers are mainly responsible for the loss of angular momentum in higher density environments. © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Subjects
Dynamics; Galaxies: clusters: general; Galaxies: evolution; Galaxies: groups: general; Galaxies: kinematics; Techniques: photometric; Techniques: spectroscopic
SDGs
Other Subjects
Angular momentum; Kinematics; Photometry; Stars; Surveys; Galaxies: clusters: General; Galaxies: groups: generals; Galaxy evolution; Galaxy: kinematics; High-density environment; Local environments; Stellar mass; Stellars; Techniques: photometric; Techniques: spectroscopic; Galaxies
Type
journal article