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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. | Language: | English | Date of Publication (YYYY-MM-DD): | 2010 | Title of Journal: | Monthly Notices of the Royal Astronomical Society | Journal Abbrev.: | MNRAS | Volume: | 402 | 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-üm-selected galaxies, we remeasure the 70-870-üm flux densities at the positions of their most likely 24-üm 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 [S250üm/S1400MHz]), and the bolometric equivalent, qIR. At z ~ 0.6, where our 250-üm filter probes rest-frame 160-üm emission, we find no evolution relative to q160 for local galaxies. We also stack the FIR and submm images at the positions of 24-üm- and radio-selected galaxies. The difference between qIR seen for 250-üm- and radio-selected galaxies suggests that star formation provides most of the IR luminosity in <~100-üJy radio galaxies, but rather less for those in the mJy regime. For the 24-üm 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:http://adsabs.harvard.edu/abs/2009MNRAS.tmp.1794I [ID No:1] | |
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