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BLAST: the far-infrared/radio correlation in distant galaxies.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Feb2010, Vol. 402 Issue 1, p245-258. 14p. 1 Color Photograph, 3 Charts, 11 Graphs. - Publication Year :
- 2010
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Abstract
- 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, [ ]), and the bolometric equivalent, qIR. At , where our 250-μm filter probes rest-frame 160-μm emission, we find no evolution relative to 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 , but qIR exhibits tentative evidence of a steady decline such that – 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ASTRONOMY
*STAR formation
*RADIO galaxies
*INFRARED detectors
*SPACE sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 402
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 47828878
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2009.15918.x