Morphological parameters of galaxies with GALEX Virtual Observatory Resource

Authors
  1. Mager V.A.
  2. Conselice C.J.
  3. Seibert M.
  4. Gusbar C.
  5. Katona A.P.,Villari J.M.
  6. Madore B.F.
  7. Windhorst R.A.
  8. Published by
    CDS
Abstract

Evolutionary studies that compare galaxy structure as a function of redshift are complicated by the fact that any particular galaxy's appearance depends in part on the rest-frame wavelength of the observation. This leads to the necessity for a "morphological k-correction" between different passbands, especially when comparing the rest-frame optical or infrared (IR) to the ultraviolet (UV). This is of particular concern for high-redshift studies that are conducted in the rest-frame UV. We investigate the effects of this "bandpass shifting" out of the UV by quantifying nearby galaxy structure via concentration, asymmetry, and clumpiness (CAS) parameters. For this study we combine panchromatic data from the UV through the near-IR with Galaxy Evolution Explorer (GALEX) data of 2073 nearby galaxies in the "near-UV" (NUV; ~230nm) and 1127 in the "far-UV" (FUV; ~150nm), providing the largest study of this kind in the mid- to far-UV. We find a relationship between the CAS parameters and observed rest-frame wavelength that make galaxies appear more late-type at shorter wavelengths, particularly in the UV. The effect is strongest for E/S0 galaxies in the far-UV, which have concentrations and asymmetries that more closely resemble those of spiral and peculiar/merging galaxies in the optical. This may be explained by extended disks containing recent star formation. Here, we also release the CAS values of the galaxies imaged in GALEX NUV and FUV for use in comparisons with deep Hubble Space Telescope imaging and the James Webb Space Telescope in the future.

Keywords
  1. galaxies
  2. galaxy-classification-systems
  3. ultraviolet-astronomy
Bibliographic source Bibcode
2018ApJ...864..123M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/864/123
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/864/123
Document Object Identifer DOI
doi:10.26093/cds/vizier.18640123

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/864/123
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/864/123
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https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/864/123/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/864/123/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/864/123/table1?
IVOA Cone Search SCS
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History

2019-09-25T12:58:41Z
Resource record created
2019-09-25T12:58:41Z
Created
2019-09-25T13:31:48Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr