Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5852
Full metadata record
DC FieldValueLanguage
dc.contributor.authorThorat, K.-
dc.contributor.authorSaripalli, Lakshmi-
dc.contributor.authorSubrahmanyan, Ravi-
dc.date.accessioned2014-01-08T13:34:15Z-
dc.date.available2014-01-08T13:34:15Z-
dc.date.issued2013-10-01-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2013, Vol. 434, p2877-91en
dc.identifier.issn1365-2966 - (online)-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/2289/5852-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractWe present a study of the environments of extended radio sources in the Australia Telescope Low Brightness Survey (ATLBS). The radio sources were selected from the Extended Source Sample (ATLBS-ESS), which is a well defined sample containing the most extended of radio sources in the ATLBS sky survey regions. The environments were analyzed using 4-m CTIO Blanco telescope observations carried out for ATLBS fields in the SDSS ${\rm r}^{\prime}$ band. We have estimated the properties of the environments using smoothed density maps derived from galaxy catalogs constructed using these optical imaging data. The angular distribution of galaxy density relative to the axes of the radio sources has been quantified by defining anisotropy parameters that are estimated using a new method presented here. Examining the anisotropy parameters for a sub-sample of extended double radio sources that includes all sources with pronounced asymmetry in lobe extents, we find good evidence for environmental anisotropy being the dominant cause for lobe asymmetry in that higher galaxy density occurs almost always on the side of the shorter lobe, and this validates the usefulness of the method proposed and adopted here. The environmental anisotropy parameters have been used to examine and compare the environments of FRI and FRII radio sources in two redshift regimes ($z<0.5$ and $z>0.5$). Wide-angle tail sources and Head-tail sources lie in the most overdense environments. The Head-tail source environments (for the HT sources in our sample) display dipolar anisotropy in that higher galaxy density appears to lie in the direction of the tails. Excluding the Head-tail and Wide-angle tail sources, subsamples of FRI and FRII sources from the ATLBS survey appear to lie in similar moderately overdense environments, with no evidence for redshift evolution in the regimes studied herein.en
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.urihttp://adsabs.harvard.edu/abs/2013arXiv1308.0884Ten
dc.relation.urihttp://arxiv.org/abs/1308.0884en
dc.relation.urihttp://dx.doi.org/ 10.1093/mnras/stt1196en
dc.rights2013 The authors & the Royal Astronomical Society.en
dc.subjectgalaxies: evolutionen
dc.subjectgalaxies: photometryen
dc.subjectradio continuumen
dc.titleEnvironments of extended radio sources in the Australia telescope low-brightness survey.en
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2013_MNRAS_434_2877-91.pdf
  Restricted Access
Restricted Access3.12 MBAdobe PDFView/Open Request a copy


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.