ATLBS extended source sample: The evolution in radio source morphology with flux density
Based on the Australia Telescope Low Brightness Survey (ATLBS) we present a sample of extended radio sources and derive morphological properties of faint radio sources. 119 radio galaxies form the ATLBS-Extended Source Sample (ATLBS-ESS) consisting of all sources exceeding 30” in extent and integrat...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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University of Chicago Press
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/27077 |
| _version_ | 1848752163432431616 |
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| author | Saripalli, L. Subrahmanyan, R. Thorat, K. Ekers, Ronald Hunstead, R. Johnston, H. Sadler, E. |
| author_facet | Saripalli, L. Subrahmanyan, R. Thorat, K. Ekers, Ronald Hunstead, R. Johnston, H. Sadler, E. |
| author_sort | Saripalli, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Based on the Australia Telescope Low Brightness Survey (ATLBS) we present a sample of extended radio sources and derive morphological properties of faint radio sources. 119 radio galaxies form the ATLBS-Extended Source Sample (ATLBS-ESS) consisting of all sources exceeding 30” in extent and integrated flux densities exceeding 1 mJy. We give structural details along with information on galaxy identifications and source classifications. The ATLBS-ESS, unlike samples with higher flux-density limits, has almost equal fractions of FR-I and FR-II radio galaxies, with a large fraction of the FR-I population exhibiting 3C31-type structures. Significant asymmetry in lobe extents appears to be a common occurrence in the ATLBS-ESS FR-I sources compared with FR-II sources. We present a sample of 22 FR-Is at z >; 0.5 with good structural information. The detection of several giant radio sources, with size exceeding 0.7 Mpc, at z > 1 suggests that giant radio sources are not less common at high redshifts. The ESS also includes a sample of 28 restarted radio galaxies. The relative abundance of dying and restarting sources is indicative of a model where radio sources undergo episodic activity in which an active phase is followed by a brief dying phase that terminates with restarting of the central activity; in any massive elliptical a few such activity cycles wherein adjacent events blend may constitute the lifetime of a radio source and such bursts of blended activity cycles may be repeated over the age of the host. The ATLBS-ESS includes a 2-Mpc giant radio galaxy with the lowest surface brightness lobes known to date. |
| first_indexed | 2025-11-14T08:04:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-27077 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:04:15Z |
| publishDate | 2012 |
| publisher | University of Chicago Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-270772017-01-30T12:56:50Z ATLBS extended source sample: The evolution in radio source morphology with flux density Saripalli, L. Subrahmanyan, R. Thorat, K. Ekers, Ronald Hunstead, R. Johnston, H. Sadler, E. radio continuum: general surveys galaxies: active Based on the Australia Telescope Low Brightness Survey (ATLBS) we present a sample of extended radio sources and derive morphological properties of faint radio sources. 119 radio galaxies form the ATLBS-Extended Source Sample (ATLBS-ESS) consisting of all sources exceeding 30” in extent and integrated flux densities exceeding 1 mJy. We give structural details along with information on galaxy identifications and source classifications. The ATLBS-ESS, unlike samples with higher flux-density limits, has almost equal fractions of FR-I and FR-II radio galaxies, with a large fraction of the FR-I population exhibiting 3C31-type structures. Significant asymmetry in lobe extents appears to be a common occurrence in the ATLBS-ESS FR-I sources compared with FR-II sources. We present a sample of 22 FR-Is at z >; 0.5 with good structural information. The detection of several giant radio sources, with size exceeding 0.7 Mpc, at z > 1 suggests that giant radio sources are not less common at high redshifts. The ESS also includes a sample of 28 restarted radio galaxies. The relative abundance of dying and restarting sources is indicative of a model where radio sources undergo episodic activity in which an active phase is followed by a brief dying phase that terminates with restarting of the central activity; in any massive elliptical a few such activity cycles wherein adjacent events blend may constitute the lifetime of a radio source and such bursts of blended activity cycles may be repeated over the age of the host. The ATLBS-ESS includes a 2-Mpc giant radio galaxy with the lowest surface brightness lobes known to date. 2012 Journal Article http://hdl.handle.net/20.500.11937/27077 University of Chicago Press restricted |
| spellingShingle | radio continuum: general surveys galaxies: active Saripalli, L. Subrahmanyan, R. Thorat, K. Ekers, Ronald Hunstead, R. Johnston, H. Sadler, E. ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title | ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title_full | ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title_fullStr | ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title_full_unstemmed | ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title_short | ATLBS extended source sample: The evolution in radio source morphology with flux density |
| title_sort | atlbs extended source sample: the evolution in radio source morphology with flux density |
| topic | radio continuum: general surveys galaxies: active |
| url | http://hdl.handle.net/20.500.11937/27077 |