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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559262.0, MPI für Astronomie / Publikationen_mpia
BLAST: the far-infrared/radio correlation in distant galaxies
Authors:Ivison, R. J.; Alexander, David M.; Biggs, Andy D.; Brandt, W. N.; Chapin, Edward L.; Coppin, Kristen E. K.; Devlin, Mark J.; Dickinson, Mark; Dunlop, James; Dye, Simon; Eales, Stephen A.; Frayer, David T.; Halpern, Mark; Hughes, David H.; Ibar, Edo; Kovás, A.; Marsden, Gaelen; Moncelsi, L.; Netterfield, Calvin B.; Pascale, Enzo; Patanchon, Guillaume; Rafferty, D. A.; Rex, Marie; Schinnerer, Eva; Scott, Douglas; Semisch, C.; Smail, Ian; Swinbank, A. M.; Truch, Matthew D. P.; Tucker, Gregory S.; Viero, Marco P.; Walter, Fabian; Weiß, Axel; Wiebe, Donald V.; Xue, Y. Q.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Issue / Number:1
Start Page:245
End Page:258
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We investigate the correlation between far-infrared (FIR) and radio luminosities in distant galaxies, a lynchpin of modern astronomy. We use data from the Balloon-borne Large Aperture Submillimetre Telescope (BLAST), Spitzer, the Large Apex BOlometer CamerA (LABOCA), the Very Large Array and the Giant Metre-wave Radio Telescope (GMRT) in the Extended Chandra Deep Field South (ECDFS). For a catalogue of BLAST 250-μm-selected galaxies, we remeasure the 70-870-μm flux densities at the positions of their most likely 24-μm counterparts, which have a median [interquartile] redshift of 0.74 [0.25, 1.57]. From these, we determine the monochromatic flux density ratio, q250(= log10 [S250μm/S1400MHz]), and the bolometric equivalent, qIR. At z ~ 0.6, where our 250-μm filter probes rest-frame 160-μm emission, we find no evolution relative to q160 for local galaxies. We also stack the FIR and submm images at the positions of 24-μm- and radio-selected galaxies. The difference between qIR seen for 250-μm- and radio-selected galaxies suggests that star formation provides most of the IR luminosity in <~100-μJy radio galaxies, but rather less for those in the mJy regime. For the 24-μm sample, the radio spectral index is constant across 0 < z < 3, but qIR exhibits tentative evidence of a steady decline such that qIR ~ (1 + z)-0.15+/-0.03 - significant evolution, spanning the epoch of galaxy formation, with major implications for techniques that rely on the FIR/radio correlation. We compare with model predictions and speculate that we may be seeing the increase in radio activity that gives rise to the radio background.
Free Keywords:galaxies: evolution; infrared: galaxies; radio continuum: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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