Comparing the Rest-Frame FUV Morphologies of of Star-Forming Galaxies at z ˜ 1.5 and z ˜ 4

Details Comparing the Rest-Frame FUV Morphologies of of Star-Forming Galaxies at z ˜ 1.5 and z ˜ 4 Comparing the Rest-Frame FUV Morphologies of of Star-Forming Galaxies at z ˜ 1.5 and z ˜ 4

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20516307l&link_type=abstract

American Astronomical Society Meeting 205, #163.07; Bulletin of the American Astronomical Society, Vol. 36, p.1615

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We apply a new approach for quantifying galaxy morphology and identifying galaxy mergers to the rest-frame far-ultraviolet images of 71 z ˜ 4 Lyman break galaxies and 55 1.2 < z < 1.8 galaxies in the GOODS and Ultra Deep Fields. We compare the morphological distributions of the Gini coefficient (G), second-order moment of the brightest 20% of the galaxy light (M20; Lotz, Primack, & Madau 2004), and concentration (C) for high-z and low-z galaxies with average signal-to-noise per pixel > 2.5 and Petrosian radii > 0.3 arcsec. We find no strong morphological differences between the fainter UDF LBG sample and the brighter GOODS LBG sample nor between the z ˜ 4 LBGs and the z ˜ 1.5 galaxies. Ten of the 71 LBG have M20 > -1.1 and possess double or multiple bright nuclei, implying a major-merger fraction ˜ 14%. Galaxies with bulge-dominated morphologies (G > 0.55, M20 < 1.6) make up ˜ 30-40% of the z ˜ 4 sample, while the remainder have G and M20 values higher than expected for smooth bulges and disks. The rest-frame FUV-B colors show no strong correlations with galaxy morphology. However, the two LBGs with colors indicative of strong 4000Å breaks have bulge-like morphologies, as does the reddest z ˜ 1.5 galaxy. J. M. L. acknowledges support from NASA, through NASA grant 9515 from the Space Telescope Science Institute, which is operated by AURA, under NASA contract NAS 5-26555.

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