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The radio properties of infrared-faint radio sources

Citation

Middleberg, E and Norris, RP and Hales, CA and Seymour, N and Johnston-Hollitt, M and Huynh, MT and Lenc, E and Mao, MY, The radio properties of infrared-faint radio sources, Astronomy and Astrophysics, 526, (Feb) EJ ISSN 0004-6361 (2011) [Refereed Article]


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Copyright 2010 ESO

DOI: doi:10.1051/0004-6361/201014926

Abstract

Context. Infrared-faint radio sources (IFRS) are objects that have flux densities of several mJy at 1.4 GHz, but that are invisible at 3.6 m when using sensitive Spitzer observations with Jy sensitivities. Their nature is unclear and difficult to investigate since they are only visible in the radio. Aims. High-resolution radio images and comprehensive spectral coverage can yield constraints on the emission mechanisms of IFRS and can give hints to similarities with known objects. Methods. We imaged a sample of 17 IFRS at 4.8 GHz and 8.6 GHz with the Australia Telescope Compact Array to determine the structures on arcsecond scales. We added radio data from other observing projects and from the literature to obtain broad-band radio spectra. Results. We find that the sources in our sample are either resolved out at the higher frequencies or are compact at resolutions of a few arcsec, which implies that they are smaller than a typical galaxy. The spectra of IFRS are remarkably steep, with a median spectral index of −1.4 and a prominent lack of spectral indices larger than −0.7. We also find that, given the IR non-detections, the ratio of 1.4 GHz flux density to 3.6 m flux density is very high, and this puts them into the same regime as high-redshift radio galaxies. Conclusions. The evidence that IFRS are predominantly high-redshift sources driven by active galactic nuclei (AGN) is strong, even though not all IFRS may be caused by the same phenomenon. Compared to the rare and painstakingly collected high-redshift radio galaxies, IFRS appear to be much more abundant, but less luminous, AGN-driven galaxies at similar cosmological distances.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active / galaxies: high-redshift
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Mao, MY (Miss Minnie Mao)
ID Code:75126
Year Published:2011
Web of Science® Times Cited:18
Deposited By:Mathematics and Physics
Deposited On:2012-01-11
Last Modified:2012-07-20
Downloads:0

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