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Title: Smaller stellar disc scale lengths in rich environments

Abstract

Abstract We investigate the dependence of stellar disc scale lengths on environment for a sample of Sloan Digital Sky Survey Data Release 7 galaxies with published photometric bulge-disc decompositions. We compare disc scale lengths at fixed bulge mass for galaxies in an isolated field environment to galaxies in X-ray rich and X-ray poor groups. At low bulge mass, stellar disc scale lengths in X-ray rich groups are smaller compared to discs in both X-ray poor groups and in isolated field environments. This decrease in disc scale length is largely independent of halo mass, though shows some dependence on group-centric distance. We also find that stellar disc scale lengths are smaller in X-ray rich environments for a subset of star-forming galaxies and for galaxies of different morphological types. We note that disc scale lengths of low mass galaxies are known to have large systematic uncertainties, however we focus on differences between samples with the same measurement biases. Our results show that stellar disc scale lengths depend on X-ray brightness, a tracer of IGM density, suggesting a role for hydrodynamic processes such as ram-pressure stripping and/or starvation.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton L8S 4L8, Canada
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1560358
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 489 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Demers, Melanie L., Parker, Laura C., and Roberts, Ian D.. Smaller stellar disc scale lengths in rich environments. United Kingdom: N. p., 2019. Web. https://doi.org/10.1093/mnras/stz2305.
Demers, Melanie L., Parker, Laura C., & Roberts, Ian D.. Smaller stellar disc scale lengths in rich environments. United Kingdom. https://doi.org/10.1093/mnras/stz2305
Demers, Melanie L., Parker, Laura C., and Roberts, Ian D.. Wed . "Smaller stellar disc scale lengths in rich environments". United Kingdom. https://doi.org/10.1093/mnras/stz2305.
@article{osti_1560358,
title = {Smaller stellar disc scale lengths in rich environments},
author = {Demers, Melanie L. and Parker, Laura C. and Roberts, Ian D.},
abstractNote = {Abstract We investigate the dependence of stellar disc scale lengths on environment for a sample of Sloan Digital Sky Survey Data Release 7 galaxies with published photometric bulge-disc decompositions. We compare disc scale lengths at fixed bulge mass for galaxies in an isolated field environment to galaxies in X-ray rich and X-ray poor groups. At low bulge mass, stellar disc scale lengths in X-ray rich groups are smaller compared to discs in both X-ray poor groups and in isolated field environments. This decrease in disc scale length is largely independent of halo mass, though shows some dependence on group-centric distance. We also find that stellar disc scale lengths are smaller in X-ray rich environments for a subset of star-forming galaxies and for galaxies of different morphological types. We note that disc scale lengths of low mass galaxies are known to have large systematic uncertainties, however we focus on differences between samples with the same measurement biases. Our results show that stellar disc scale lengths depend on X-ray brightness, a tracer of IGM density, suggesting a role for hydrodynamic processes such as ram-pressure stripping and/or starvation.},
doi = {10.1093/mnras/stz2305},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 489,
place = {United Kingdom},
year = {2019},
month = {8}
}

Journal Article:
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