Galaxy Structure in the Ultraviolet

The Dependence of Morphological Parameters on Rest-frame Wavelength

Violet A. Mager, Christopher J. Conselice, Mark Seibert, Courtney Gusbar, Anthony P. Katona, Joseph M. Villari, Barry F. Madore, Rogier Windhorst

Research output: Contribution to journalArticle

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; ∼230 nm) and 1127 in the "far-UV" (FUV; ∼150 nm), 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.

Original languageEnglish (US)
Article number123
JournalAstrophysical Journal
Volume864
Issue number2
DOIs
StatePublished - Sep 10 2018

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asymmetry
galaxies
wavelength
wavelengths
near infrared
parameter
James Webb Space Telescope
Hubble Space Telescope
star formation
effect

Keywords

  • galaxies: evolution
  • galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Galaxy Structure in the Ultraviolet : The Dependence of Morphological Parameters on Rest-frame Wavelength. / Mager, Violet A.; Conselice, Christopher J.; Seibert, Mark; Gusbar, Courtney; Katona, Anthony P.; Villari, Joseph M.; Madore, Barry F.; Windhorst, Rogier.

In: Astrophysical Journal, Vol. 864, No. 2, 123, 10.09.2018.

Research output: Contribution to journalArticle

Mager, Violet A. ; Conselice, Christopher J. ; Seibert, Mark ; Gusbar, Courtney ; Katona, Anthony P. ; Villari, Joseph M. ; Madore, Barry F. ; Windhorst, Rogier. / Galaxy Structure in the Ultraviolet : The Dependence of Morphological Parameters on Rest-frame Wavelength. In: Astrophysical Journal. 2018 ; Vol. 864, No. 2.
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