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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4375
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dc.contributor.authorSaripalli, Lakshmi-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorThorat, K.-
dc.contributor.authorEkers, R.D.-
dc.contributor.authorHunstead, R.W.-
dc.contributor.authorJohnston, H.M.-
dc.contributor.authorSadler, E.M.-
dc.date.accessioned2012-03-29T08:27:16Z-
dc.date.available2012-03-29T08:27:16Z-
dc.date.issued2012-03-15-
dc.identifier.citationAstrophysical Journal Supplement Series, 2012, Vol. 199, p27en
dc.identifier.issn1538-4365-(online)-
dc.identifier.issn0067-0049 (Print)-
dc.identifier.urihttp://hdl.handle.net/2289/4375-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractBased on the Australia Telescope Low Brightness Survey (ATLBS) we present a sample of extended radio sources and derive morphological properties of faint radio sources. One hundred nineteen 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.en
dc.language.isoenen
dc.publisherIOP Publishing for the American Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/abs/2012ApJS..199...27Sen
dc.relation.urihttp://arxiv.org/abs/0911.4571en
dc.relation.urihttp://dx.doi.org/10.1088/0067-0049/199/2/27en
dc.rights2012 The American Astronomical Societyen
dc.subjectGalaxies: activeen
dc.subjectRadio continuumen
dc.titleATLBS extended source sample : The evolution in radio source morphology with flux densityen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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