The Rest-Frame Far-Ultraviolet Morphologies of Star-forming Galaxies at z ~ 1.5 and 4

Details The Rest-Frame Far-Ultraviolet Morphologies of Star-forming Galaxies at z ~ 1.5 and 4 The Rest-Frame Far-Ultraviolet Morphologies of Star-forming Galaxies at z ~ 1.5 and 4

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...636..592l&link_type=abstract

The Astrophysical Journal, Volume 636, Issue 2, pp. 592-609.

Astronomy and Astrophysics

Astronomy

92

Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Interactions, Galaxies: Structure, Ultraviolet: Galaxies

Scientific paper

We apply a new approach to quantifying galaxy morphology and identifying galaxy mergers to the rest-frame far-ultraviolet images of 82 z~4 Lyman break galaxies (LBGs) and 55 1.22.5 and Petrosian radii >0.3". Ten of the 82 LBGs have M20>=-1.1 and possess bright double or multiple nuclei, implying a major-merger fraction of star-forming galaxies ~10%-25% at MFUV<-20, depending on our incompleteness corrections. Galaxies with bulge-like morphologies (G>=0.55, M20<-1.6) make up ~30% of the z~4 LBG sample, while the remaining ~50% have G- and M20-values higher than expected for smooth bulges and disks and may be star-forming disks, minor mergers, or postmergers. The star-forming z~1.5 galaxy sample has a morphological distribution that is similar to the UDF z~4 LBGs, with an identical fraction of major-merger candidates but fewer spheroids. The observed morphological distributions are roughly consistent with current hierarchical model predictions for the major-merger rates and minor-merger-induced starbursts at z~1.5 and ~4. We also examine the rest-frame FUV-NUV and FUV-B colors as a function of morphology and find no strong correlations at either epoch.

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