Sargent, M. T. and Carollo, C. M. and Kampczyk, P. and Lilly, S. J. and Scarlata, C. and Capak, P. and Ilbert, O. and Koekemoer, A. M. and Kneib, J.-P. and Leauthaud, A. and Massey, R. and Oesch, P. A. and Rhodes, J. and Schinnerer, E. and Scoville, N. and Taniguchi, Y. (2010) The Opacity of Galactic Disks at z ~ 0.7. Astrophysical Journal Letters, 714 (1). L113-L117. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100602-140157782
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We compare the surface brightness-inclination relation for a sample of COSMOS pure disk galaxies at z ~ 0.7 with an artificially redshifted sample of Sloan Digital Sky Survey (SDSS) disks well matched to the COSMOS sample in terms of rest-frame photometry and morphology, as well as their selection and analysis. The offset between the average surface brightness of face-on and edge-on disks in the redshifted SDSS sample matches that predicted by measurements of the optical depth of galactic disks in the nearby universe. In contrast, large disks at z ~ 0.7 have a virtually flat surface brightness-inclination relation, suggesting that they are more opaque than their local counterparts. This could be explained by either an increased amount of optically thick material in disks at higher redshift or a different spatial distribution of the dust.
|Additional Information:||© 2010 American Astronomical Society. Received 2010 February 1; accepted 2010 March 17; published 2010 April 5. We gratefully acknowledge the anonymous referee’s helpful suggestions and the contribution of the COSMOS collaboration and its more than 100 scientists worldwide. P.K., P.A.O., C.S., and M.T.S. acknowledge support from the Swiss National Science Foundation. This research was also financed by DFG grant SCHI 536/3-2. The HST COSMOS Treasury programwas supported through NASA grant HST-GO-09822. Facilities: HST (ACS), Subaru (SuprimeCam)|
|Subject Keywords:||cosmology: observations; dust, extinction; galaxies: spiral; surveys|
|Classification Code:||PACS: 98.62.Hr; 98.80.Cq; 98.38.Cp; 98.52.Nr; 98.62.Py; 98.62.Ai.|
|Official Citation:||M. T. Sargent et al 2010 ApJ 714 L113 doi: 10.1088/2041-8205/714/1/L113|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||03 Jun 2010 15:25|
|Last Modified:||26 Dec 2012 12:06|
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