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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308511.0, MPI für Astronomie / Publikationen_mpia
Detecting faint galaxies by stacking at 24 µm
Authors:Zheng, X. Z.; Bell, E. F.; Rix, H.-W.; Papovich, C.; Le Floc'h, E.; Rieke, G. H.; Pérez-González, P. G.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:784
End Page:800
Audience:Not Specified
Abstract / Description:We stack Spitzer 24 mum images for ~7000 galaxies with 0.1<=z<1 in the Chandra Deep Field South to probe the thermal dust emission in low-luminosity galaxies over this redshift range. Through stacking, we can detect mean 24 mum fluxes that are more than an order of magnitude below the individual detection limit. We find that the correlations for low- and moderate-luminosity galaxies between the average LIR/LUV and rest-frame B-band luminosity, and between the star formation rate (SFR) and LIR/LUV, are similar to those in the local universe. This verifies that oft-used assumption in deep UV/optical surveys that the dust obscuration-SFR relation for galaxies with SFR<=20 Msolar yr-1 varies little with epoch. We have used this relation to derive the cosmic IR luminosity density from z=1 to z=0.1. The results also demonstrate directly that little of the bolometric luminosity of the galaxy population arises from the faint end of the luminosity function, indicating a relatively flat faint-end slope of the IR luminosity function with a power-law index of 1.2+/-0.3.
Free Keywords:Galaxies: Evolution; Galaxies: General; Infrared: Galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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