Projects per year
The kinematic morphology-density relation of galaxies is normally attributed to a changing distribution of galaxy stellar masses with the local environment. However, earlier studies were largely focused on slow rotators; the dynamical properties of the overall population in relation to environment have received less attention. We use the SAMI Galaxy Survey to investigate the dynamical properties of ∼1800 early and late-type galaxies with log (M★/M⊙) > 9.5 as a function of mean environmental overdensity (Σ5) and their rank within a group or cluster. By classifying galaxies into fast and slow rotators, at fixed stellar mass above log (M★/M⊙) > 10.5, we detect a higher fraction (∼3.4σ) of slow rotators for group and cluster centrals and satellites as compared to isolated-central galaxies. We find similar results when using Σ5 as a tracer for environment. Focusing on the fast-rotator population, we also detect a significant correlation between galaxy kinematics and their stellar mass as well as the environment they are in. Specifically, by using inclination-corrected or intrinsic λRe values, we find that, at fixed mass, satellite galaxies on average have the lowest λRe,intr, isolated-central galaxies have the highest λRe,intr, and group and cluster centrals lie in between. Similarly, galaxies in high-density environments have lower mean λRe,intr values as compared to galaxies at low environmental density. However, at fixed Σ5, the mean λRe,intr differences for low and high-mass galaxies are of similar magnitude as when varying Σ5 (Δ λRe,intr ∼ 0.05, with σrandom = 0.025, and σsyst < 0.03). Our results demonstrate that after stellar mass, environment plays a significant role in the creation of slow rotators, while for fast rotators we also detect an independent, albeit smaller, impact of mass and environment on their kinematic properties.
|Number of pages||22|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publication status||Published - 1 Dec 2021|
Bibliographical noteThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 2, December 2021, Pages 2307–2328, https://doi.org/10.1093/mnras/stab2647. Copyright 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
- cosmology: observations
- galaxies: evolution
- galaxies: formation
- galaxies: kinematics and dynamics
- galaxies: stellar content
- galaxies: structure
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- 2 Finished
Cosmic origins: How do galaxies build chemical complexity over cosmic time?
McDermid, R., MQRES (International), M. & MQRES, M.
13/06/16 → 31/12/21
The impact of impact: what stops star formation in cluster galaxies?
5/01/15 → 31/12/20