Hubble Space Telescope Images of submillimeter sources

Large irregular galaxies at high redshift

S. C. Chapman, Rogier Windhorst, S. Odewahn, H. Yan, C. Conselice

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

We present new Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS) high-resolution optical imaging of a sample of 13 submillimeter luminous galaxies for which the optical emission has been pinpointed either through radio 1.4 GHz or millimeter interferometry. We find a predominance of irregular and complex morphologies in the sample, suggesting that mergers are likely common for submillimeter galaxies. The component separations in these objects are on average a factor 2 larger than in local galaxies with similarly high bolometric luminosities. The sizes and star formation rates of the submillimeter galaxies are consistent with the maximal star formation rate densities of 20 M kpc-2 in local starburst galaxies (Lehnert & Heckman). We derive quantitative morphological information for optical galaxies hosting submillimeter emission: total and isophotal magnitudes, Petrosian radius, effective radius, concentration, aspect ratio, surface brightness, and asymmetry. We compare these morphological indexes with those of other galaxies lying within the same STIS images. Most strikingly, we find ∼70% of the submillimeter galaxies to be extraordinarily large and elongated relative to the field population, regardless of optical magnitude. Comparison of the submillimeter galaxy morphologies with those of optically selected galaxies at z ∼ 2-3 reveals the submillimeter galaxies to be a morphologically distinct population, with generally larger sizes, higher concentrations, and more prevalent major-merger configurations.

Original languageEnglish (US)
Pages (from-to)92-104
Number of pages13
JournalAstrophysical Journal
Volume599
Issue number1 I
DOIs
StatePublished - Dec 10 2003

Fingerprint

irregular galaxies
Hubble Space Telescope
galaxies
merger
interferometry
asymmetry
radio
star formation rate
spectrographs
morphological indexes
telescopes
radii
starburst galaxies
rate
light emission
aspect ratio
brightness
luminosity

Keywords

  • Cosmology: observations
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: high-redshift
  • Galaxies: starburst

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Hubble Space Telescope Images of submillimeter sources : Large irregular galaxies at high redshift. / Chapman, S. C.; Windhorst, Rogier; Odewahn, S.; Yan, H.; Conselice, C.

In: Astrophysical Journal, Vol. 599, No. 1 I, 10.12.2003, p. 92-104.

Research output: Contribution to journalArticle

Chapman, S. C. ; Windhorst, Rogier ; Odewahn, S. ; Yan, H. ; Conselice, C. / Hubble Space Telescope Images of submillimeter sources : Large irregular galaxies at high redshift. In: Astrophysical Journal. 2003 ; Vol. 599, No. 1 I. pp. 92-104.
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