dc.contributor.author | Simpson, Chris | en_US |
dc.contributor.author | Rawlings, Steve | en_US |
dc.contributor.author | Ivision, Rob | en_US |
dc.contributor.author | Akiyama, Masayuki | en_US |
dc.contributor.author | Almaini, Omar | en_US |
dc.contributor.author | Bradshaw, Emma | en_US |
dc.contributor.author | Chapman, Scott | en_US |
dc.contributor.author | Chuter, Rob | en_US |
dc.contributor.author | Croom, Scott | en_US |
dc.contributor.author | Dunlop, Jim | en_US |
dc.contributor.author | Foucaud, Sebastien | en_US |
dc.contributor.author | Hartley, Will | en_US |
dc.date.accessioned | 2014-03-12T19:20:59Z | |
dc.date.available | 2014-03-12T19:20:59Z | |
dc.date.issued | 2012-01-16 | en_US |
dc.identifier.citation | Simpson, Chris, Steve Rawlings, Rob Ivision, Masayuki Akiyama, et al. 2012. "Radio imaging of the Subaru/XMM-Newton Deep Field - III. Evolution of the radio luminosity function beyond z=1." Monthly Notices of the Royal Astronomical Society 421:3060. | en_US |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/10222/45430 | |
dc.identifier.uri | http://dx.doi.org/10.1111/j.1365-2966.2012.20529.x | |
dc.description.abstract | We present spectroscopic and eleven-band photometric redshifts for galaxies in the 100-uJy Subaru/XMM-Newton Deep Field radio source sample. We find good agreement between our redshift distribution and that predicted by the SKA Simulated Skies project. We find no correlation between K-band magnitude and radio flux, but show that sources with 1.4-GHz flux densities below ~1mJy are fainter in the near-infrared than brighter radio sources at the same redshift, and we discuss the implications of this result for spectroscopically-incomplete samples where the K-z relation has been used to estimate redshifts. We use the infrared--radio correlation to separate our sample into radio-loud and radio-quiet objects and show that only radio-loud hosts have spectral energy distributions consistent with predominantly old stellar populations, although the fraction of objects displaying such properties is a decreasing function of radio luminosity. We calculate the 1.4-GHz radio luminosity function (RLF) in redshift bins to z=4 and find that the space density of radio sources increases with lookback time to z~2, with a more rapid increase for more powerful sources. We demonstrate that radio-loud and radio-quiet sources of the same radio luminosity evolve very differently. Radio-quiet sources display strong evolution to z~2 while radio-loud AGNs below the break in the radio luminosity function evolve more modestly and show hints of a decline in their space density at z>1, with this decline occurring later for lower-luminosity objects. If the radio luminosities of these sources are a function of their black hole spins then slowly-rotating black holes must have a plentiful fuel supply for longer, perhaps because they have yet to encounter the major merger that will spin them up and use the remaining gas in a major burst of star formation. | en_US |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.title | Radio imaging of the Subaru/XMM-Newton Deep Field - III. Evolution of the radio luminosity function beyond z=1 | en_US |
dc.title.alternative | arXiv:1201.3225 [astro-ph] | en_US |
dc.type | article | en_US |
dc.identifier.volume | 421 | |
dc.identifier.startpage | 3060 | en_US |