Morphology of z 0.7 Star-forming Galaxies from Deep GALEX Imaging of the COSMOS Field

Details Morphology of z 0.7 Star-forming Galaxies from Deep GALEX Imaging of the COSMOS Field Morphology of z 0.7 Star-forming Galaxies from Deep GALEX Imaging of the COSMOS Field

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922504z&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #225.04; Bulletin of the American Astronomical Society,

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We selected a sample of 8,146 galaxies with brightness F814W(HST) < 23 mag (AB) and photometric redshifts in the range 0.55 < z < 0.8 from the COSMOS field, 5,777 of which are detected in the GALEX near-ultraviolet band (2310Å) down to a limiting magnitude of 25.5 (AB), to study the relation between star formation and galaxy morphology at a redshift of z 0.7. For all galaxies in our sample, we computed, from the ACS F814W images, their concentration (C), asymmetry (A) and clumpiness (S) as well as their Gini coefficient (G) and the second moment of their light distribution (M20). We observe a bimodality in the galaxy population in asymmetry and in clumpiness, with the separation being most evident when either of those parameters is combined with a concentration-like parameter (C, G or M20). We see a strong correspondence between this morphological bimodality and the red and blue sequence color bimodality, suggesting that color and morphological evolution occur concurrently and on similar time scales. We further observe many of the most star-forming galaxies to have compact dusty disks with important bulges and morphologies approaching that of early-type galaxies, which we interpret as evidence that strong starburst events can bring galaxies from the blue sequence onto the red sequence while simultaneously modifying their morphology accordingly.

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