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IR and UV Galaxies at z = 0.6: Evolution of Dust Attenuation and Stellar Mass as Revealed by SWIRE and GALEX

Xu, C. Kevin and Shupe, David and Buat, Veronique and Rowan-Robinson, Michael and Babbedge, Thomas and Iglesias-Páramo, Jorge and Takeuchi, Tsutomu T. and Barlow, Tom A. and Conrow, Tim and Fang, Fan and Forster, Karl and Friedman, Peter G. and Gonzalez-Solares, Eduardo and Lonsdale, Carol and Martin, D. Christopher and Morrissey, Patrick and Neff, Susan G. and Schiminovich, David and Seibert, Mark and Small, Todd and Smith, Gene and Surace, Jason and Wyder, Ted K. (2007) IR and UV Galaxies at z = 0.6: Evolution of Dust Attenuation and Stellar Mass as Revealed by SWIRE and GALEX. Astrophysical Journal Supplement Series, 173 (2). pp. 432-440. ISSN 0067-0049.

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We study dust attenuation and stellar mass of z ~ 0.6 star-forming galaxies using new SWIRE observations in IR and GALEX observations in UV. Two samples are selected from the SWIRE and GALEX source catalogs in the SWIRE/GALEX field ELAIS-N1-00 (Ω = 0.8 deg^2). The UV-selected sample has 600 galaxies with photometric redshift (hereafter photo-z) 0.5 ≤ z ≤ 0.7 and NUV ≤ 23.5 (corresponding to L_(FUV) ≥ 10^(9.6) L_☉). The IR-selected sample contains 430 galaxies with f_(24 μm) ≥ 0.2 mJy (L_(dust) ≥ 10^(10.8) L_☉) in the same photo-z range. It is found that the mean L_(dust)/L_(FUV) ratios of the z = 0.6 UV galaxies are consistent with that of their z = 0 counterparts of the same L_(FUV). For IR galaxies, the mean L_(dust)/L_(FUV) ratios of the z = 0.6 LIRGs (L_(dust) ~ 10^(11) L_☉) are about a factor of 2 lower than local LIRGs, whereas z = 0.6 ULIRGs (L_(dust) ~ 10^(12) L_☉) have the same mean L_(dust)/L_(FUV) ratios as their local counterparts. This is consistent with the hypothesis that the dominant component of LIRG population has changed from large, gas-rich spirals at z > 0.5 to major mergers at z = 0. The stellar mass of z = 0.6 UV galaxies of L_(FUV) ≤ 10^(10.2) L_☉ is about a factor of 2 less than their local counterparts of the same luminosity, indicating growth of these galaxies. The mass of z = 0.6 UV luminous galaxies (UVLGs: L_(FUV) > 10^(10.2) L_☉) and IR-selected galaxies, which are nearly exclusively LIRGs and ULIRGs, is the same as their local counterparts.

Item Type:Article
Related URLs:
URLURL TypeDescription
Xu, C. Kevin0000-0002-1588-6700
Shupe, David0000-0003-4401-0430
Forster, Karl0000-0001-5800-5531
Lonsdale, Carol0000-0003-0898-406X
Martin, D. Christopher0000-0002-8650-1644
Morrissey, Patrick0000-0001-8177-1023
Seibert, Mark0000-0002-1143-5515
Surace, Jason0000-0001-7291-0087
Additional Information:© 2007 American Astronomical Society. Print publication: Issue 2 (2007 December); received 2006 April 10; accepted 2006 December 4. GALEX (Galaxy Evolution Explorer ) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Support for this work, part of the Spitzer Space Telescope Legacy Science Program, was provided by NASA through an award issued by JPL under NASA contract 1407. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and NSF.
Group:Space Radiation Laboratory, Space Astrophysics Laboratory, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:dust, extinction; galaxies: active; galaxies: evolution; infrared: galaxies; ultraviolet: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20091117-111643880
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Official Citation:IR and UV Galaxies at z = 0.6: Evolution of Dust Attenuation and Stellar Mass as Revealed by SWIRE and GALEX C. Kevin Xu, David Shupe, Veronique Buat, Michael Rowan-Robinson, Thomas Babbedge, Jorge Iglesias-Páramo, Tsutomu T. Takeuchi, Tom A. Barlow, Tim Conrow, Fan Fang, Karl Forster, Peter G. Friedman, Eduardo Gonzales-Solares, Carol Lonsdale, D. Christopher Martin, Patrick Morrissey, Susan G. Neff, David Schiminovich, Mark Seibert, Todd Small, Gene Smith, Jason Surace, and Ted K. Wyder 2007 ApJS 173 432-440 doi: 10.1086/516641
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16729
Deposited By: Jason Perez
Deposited On:25 Nov 2009 20:01
Last Modified:09 Mar 2020 21:05

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