Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei?
Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of a sample of these sources taken as part of the Spitzer Extragalactic Represent...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/9787 |
| _version_ | 1848746050735570944 |
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| author | Norris, R. Afonso, J. Cava, A. Farrah, D. Huynh, M. Ivison, R. Jarvis, M. Lacy, M. Mao, M. Maraston, C. Mauduit, J. Middelberg, E. Oliver, S. Seymour, Nick Surace, J. |
| author_facet | Norris, R. Afonso, J. Cava, A. Farrah, D. Huynh, M. Ivison, R. Jarvis, M. Lacy, M. Mao, M. Maraston, C. Mauduit, J. Middelberg, E. Oliver, S. Seymour, Nick Surace, J. |
| author_sort | Norris, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of a sample of these sources taken as part of the Spitzer Extragalactic Representative Volume Survey. Nearly all the IFRSs are undetected at a level of ~1 µJy in these new deep observations, and even the detections are consistent with confusion with unrelated galaxies. A stacked image implies that the median flux density is S3.6 µm ~ 0.2 µJy or less, giving extreme values of the radio-infrared flux density ratio. Comparison of these objects with known classes of object suggests that the majority are probably high-redshift radio-loud galaxies, possibly suffering from significant dust extinction. © 2011. The American Astronomical Society. All rights reserved. |
| first_indexed | 2025-11-14T06:27:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-9787 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:27:06Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-97872023-02-22T06:24:16Z Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? Norris, R. Afonso, J. Cava, A. Farrah, D. Huynh, M. Ivison, R. Jarvis, M. Lacy, M. Mao, M. Maraston, C. Mauduit, J. Middelberg, E. Oliver, S. Seymour, Nick Surace, J. Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of a sample of these sources taken as part of the Spitzer Extragalactic Representative Volume Survey. Nearly all the IFRSs are undetected at a level of ~1 µJy in these new deep observations, and even the detections are consistent with confusion with unrelated galaxies. A stacked image implies that the median flux density is S3.6 µm ~ 0.2 µJy or less, giving extreme values of the radio-infrared flux density ratio. Comparison of these objects with known classes of object suggests that the majority are probably high-redshift radio-loud galaxies, possibly suffering from significant dust extinction. © 2011. The American Astronomical Society. All rights reserved. 2011 Journal Article http://hdl.handle.net/20.500.11937/9787 10.1088/0004-637X/736/1/55 unknown |
| spellingShingle | Norris, R. Afonso, J. Cava, A. Farrah, D. Huynh, M. Ivison, R. Jarvis, M. Lacy, M. Mao, M. Maraston, C. Mauduit, J. Middelberg, E. Oliver, S. Seymour, Nick Surace, J. Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title | Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title_full | Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title_fullStr | Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title_full_unstemmed | Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title_short | Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? |
| title_sort | deep spitzer observations of infrared-faint radio sources: high-redshift radio-loud active galactic nuclei? |
| url | http://hdl.handle.net/20.500.11937/9787 |