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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358520.0, MPI für Astronomie / Publikationen_mpia
Infrared spectral energy distributions of z ~ 0.7 star-forming galaxies
Authors:Zheng, X. Z.; Dole, H.; Bell, E. F.; Le Floc'h, E.; Rieke, G. H.; Rix, H.-W.; Schiminovich, D.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:301
End Page:312
Audience:Not Specified
Abstract / Description:We analyze the infrared (IR) spectral energy distributions (SEDs) for 10 mum<lambdarest<100 mum for ~600 galaxies at z~0.7 in the extended Chandra Deep Field South by stacking their Spitzer 24, 70, and 160 mum images. We place interesting constraints on the average IR SED shape in two bins: the brightest 25% of z~0.7 galaxies detected at 24 mum, and the remaining 75% of individually detected galaxies. Galaxies without individual detections at 24 mum were not well detected at 70 and 160 mum even through stacking. We find that the average IR SEDs of z~0.7 star-forming galaxies fall within the diversity of z~0 templates. While dust obscuration LIR/LUV seems to be only a function of star formation rate (SFR; ~LIR+LUV), not of redshift, the dust temperature of star-forming galaxies (with SFR~10 Msolar yr-1 ) at a given IR luminosity was lower at z~0.7 than today. We suggest an interpretation of this phenomenology in terms of dust geometry: intensely star-forming galaxies at z~0 are typically interacting, and host dense centrally concentrated bursts of star formation and warm dust temperatures. At z~0.7, the bulk of intensely star-forming galaxies are relatively undisturbed spirals and irregulars, and we postulate that they have large amounts of widespread lower density star formation, yielding lower dust temperatures for a given IR luminosity. We recommend which IR SEDs are most suitable for modeling intermediate-redshift galaxies with different SFRs.
Free Keywords:Galaxies: Evolution; Galaxies: Starburst; Infrared: Galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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