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Deep GALEX Imaging of the HST/COSMOS Field: A First Look at the Morphology of z~0.7 Star-forming Galaxies | | M. A. Zamojski
; D. Schiminovich
; R. M. Rich
; B. Mobasher
; A. M. Koekemoer
; P. Capak
; Y. Taniguchi
; S. S. Sasaki
; H. J. McCracken
; Y. Mellier
; E. Bertin
; H. Aussel
; D. B. Sanders
; O. Le Fevre
; O. Ilbert
; M. Salvato
; D. J. Thompson
; J. S. Kartaltepe
; N. Scoville
; T. A. Barlow
; K. Forster
; P. G. Friedman
; D. C. Martin
; P. Morrisey
; S. G. Neff
; M. Seibert
; T. Small
; T. K. Wyder
; L. Bianchi
; J. Donas
; T. M. Heckman
; Y.-W. Lee
; B. F. Madore
; B. Milliard
; A. S. Szalay
; B. Y. Welsh
; S. K. Yi
; | | Date: |
17 Jan 2007 | | Abstract: | We present a study of the morphological nature of redshift z~0.7 star-forming galaxies using a combination of HST/ACS, GALEX and ground-based images of the COSMOS field. Our sample consists of 8,146 galaxies, 5,777 of which are detected in the GALEX near-ultraviolet band down to a limiting magnitude of 25.5 (AB). We make use of the UV to estimate star formation rates, correcting for the effect of dust using the UV-slope, and compute, from the ACS F814W images, the C,A,S,G,M20 morphological parameters for all objects in our sample. We observe a morphological bimodality in the galaxy population and show that it has a strong correspondence with the FUV - g color bimodality. We conclude that UV-optical color predominantly evolves concurrently with morphology. We observe many of the most star-forming galaxies to have morphologies approaching that of early-type galaxies, and interpret this as evidence that strong starburst events are linked to bulge growth and constitute a process through which galaxies can be brought from the blue to the red sequence while simultaneously modifying their morphology accordingly. We conclude that the red sequence has continued growing at z~<0.7. We also observe z~0.7 galaxies to have physical properties similar to that of local galaxies, except for higher star formation rates. Whence we infer that the dimming of star-forming galaxies is responsible for most of the evolution in the star formation rate density of the Universe since that redshift, although our data are also consistent with a mild number evolution. [abridged] | | Source: | arXiv, astro-ph/0701478 | | Services: | Forum | Review | PDF | Favorites | |
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