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Stellar kinematics and environment at z ∼ 0.8 in the LEGA-C survey : massive slow rotators are built first in overdense environments

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Abstract
In this Letter, we investigate the impact of environment on integrated and spatially resolved stellar kinematics of a sample of massive, quiescent galaxies at intermediate redshift (0.6 < z < 1.0). For this analysis, we combine photometric and spectroscopic parameters from the UltraVISTA and Large Early Galaxy Astrophysics Census surveys in the COSMOS field and environmental measurements. We analyze the trends with overdensity (1+delta) on the rotational support of quiescent galaxies and find no universal trends at either fixed mass or fixed stellar velocity dispersion. This is consistent with previous studies of the local universe; rotational support of massive galaxies depends primarily on stellar mass. We highlight two populations of massive galaxies (log M-*/M-circle dot >= 11) that deviate from the average mass relation. First, the most massive galaxies in the most underdense regions ((1 + delta) <= 1) exhibit elevated rotational support. Similarly, at the highest masses (log M-*/M-circle dot >= 11.25) the range in rotational support is significant in all but the densest regions. This corresponds to an increasing slow-rotator fraction such that only galaxies in the densest environments ((1 + delta) >= 3.5) are primarily (90% +/- 10%) slow rotators. This effect is not seen at fixed velocity dispersion, suggesting minor merging as the driving mechanism: only in the densest regions have the most massive galaxies experienced significant minor merging, building stellar mass and diminishing rotation without significantly affecting the central stellar velocity dispersion. In the local universe, most massive galaxies are slow rotators, regardless of environment, suggesting minor merging occurs at later cosmic times (z less than or similar to 0.6) in all but the most dense environments.
Keywords
Space and Planetary Science, Astronomy and Astrophysics, EARLY-TYPE GALAXIES, TELESCOPE ADVANCED CAMERA, ATLAS(3D) PROJECT, DARK-MATTER, ANGULAR-MOMENTUM, MINOR MERGERS, COMPACT GALAXIES, NUMBER DENSITY, LIGHT RATIO, EVOLUTION

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Citation

Please use this url to cite or link to this publication:

MLA
Cole, Justin, et al. “Stellar Kinematics and Environment at z ∼ 0.8 in the LEGA-C Survey : Massive Slow Rotators Are Built First in Overdense Environments.” ASTROPHYSICAL JOURNAL LETTERS, vol. 890, no. 2, 2020, doi:10.3847/2041-8213/ab7241.
APA
Cole, J., Bezanson, R., van der Wel, A., Bell, E., D’Eugenio, F., Franx, M., … Wu, P.-F. (2020). Stellar kinematics and environment at z ∼ 0.8 in the LEGA-C survey : massive slow rotators are built first in overdense environments. ASTROPHYSICAL JOURNAL LETTERS, 890(2). https://doi.org/10.3847/2041-8213/ab7241
Chicago author-date
Cole, Justin, Rachel Bezanson, Arjen van der Wel, Eric Bell, Francesco D’Eugenio, Marijn Franx, Anna Gallazzi, et al. 2020. “Stellar Kinematics and Environment at z ∼ 0.8 in the LEGA-C Survey : Massive Slow Rotators Are Built First in Overdense Environments.” ASTROPHYSICAL JOURNAL LETTERS 890 (2). https://doi.org/10.3847/2041-8213/ab7241.
Chicago author-date (all authors)
Cole, Justin, Rachel Bezanson, Arjen van der Wel, Eric Bell, Francesco D’Eugenio, Marijn Franx, Anna Gallazzi, Josha van Houdt, Adam Muzzin, Camilla Pacifici, Jesse van de Sande, David Sobral, Caroline Straatman, and Po-Feng Wu. 2020. “Stellar Kinematics and Environment at z ∼ 0.8 in the LEGA-C Survey : Massive Slow Rotators Are Built First in Overdense Environments.” ASTROPHYSICAL JOURNAL LETTERS 890 (2). doi:10.3847/2041-8213/ab7241.
Vancouver
1.
Cole J, Bezanson R, van der Wel A, Bell E, D’Eugenio F, Franx M, et al. Stellar kinematics and environment at z ∼ 0.8 in the LEGA-C survey : massive slow rotators are built first in overdense environments. ASTROPHYSICAL JOURNAL LETTERS. 2020;890(2).
IEEE
[1]
J. Cole et al., “Stellar kinematics and environment at z ∼ 0.8 in the LEGA-C survey : massive slow rotators are built first in overdense environments,” ASTROPHYSICAL JOURNAL LETTERS, vol. 890, no. 2, 2020.
@article{8677241,
  abstract     = {{In this Letter, we investigate the impact of environment on integrated and spatially resolved stellar kinematics of a sample of massive, quiescent galaxies at intermediate redshift (0.6 < z < 1.0). For this analysis, we combine photometric and spectroscopic parameters from the UltraVISTA and Large Early Galaxy Astrophysics Census surveys in the COSMOS field and environmental measurements. We analyze the trends with overdensity (1+delta) on the rotational support of quiescent galaxies and find no universal trends at either fixed mass or fixed stellar velocity dispersion. This is consistent with previous studies of the local universe; rotational support of massive galaxies depends primarily on stellar mass. We highlight two populations of massive galaxies (log M-*/M-circle dot >= 11) that deviate from the average mass relation. First, the most massive galaxies in the most underdense regions ((1 + delta) <= 1) exhibit elevated rotational support. Similarly, at the highest masses (log M-*/M-circle dot >= 11.25) the range in rotational support is significant in all but the densest regions. This corresponds to an increasing slow-rotator fraction such that only galaxies in the densest environments ((1 + delta) >= 3.5) are primarily (90% +/- 10%) slow rotators. This effect is not seen at fixed velocity dispersion, suggesting minor merging as the driving mechanism: only in the densest regions have the most massive galaxies experienced significant minor merging, building stellar mass and diminishing rotation without significantly affecting the central stellar velocity dispersion. In the local universe, most massive galaxies are slow rotators, regardless of environment, suggesting minor merging occurs at later cosmic times (z less than or similar to 0.6) in all but the most dense environments.}},
  articleno    = {{L25}},
  author       = {{Cole, Justin and Bezanson, Rachel and van der Wel, Arjen and Bell, Eric and D'Eugenio, Francesco and Franx, Marijn and Gallazzi, Anna and van Houdt, Josha and Muzzin, Adam and Pacifici, Camilla and van de Sande, Jesse and Sobral, David and Straatman, Caroline and Wu, Po-Feng}},
  issn         = {{2041-8205}},
  journal      = {{ASTROPHYSICAL JOURNAL LETTERS}},
  keywords     = {{Space and Planetary Science,Astronomy and Astrophysics,EARLY-TYPE GALAXIES,TELESCOPE ADVANCED CAMERA,ATLAS(3D) PROJECT,DARK-MATTER,ANGULAR-MOMENTUM,MINOR MERGERS,COMPACT GALAXIES,NUMBER DENSITY,LIGHT RATIO,EVOLUTION}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{7}},
  title        = {{Stellar kinematics and environment at z ∼ 0.8 in the LEGA-C survey : massive slow rotators are built first in overdense environments}},
  url          = {{http://dx.doi.org/10.3847/2041-8213/ab7241}},
  volume       = {{890}},
  year         = {{2020}},
}

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