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Redshifted Hi and OH absorption in radio galaxies and quasars

Curran, S.J.; Whiting, Matthew T; Murphy, M T; Webb, J. K.; Bignell, C; Polatidis, A. G.; Wiklind, T; Francis, Paul; Langston, G I

Description

From a survey for the redshifted Hi 21-cm and OH 18-cm absorption in the hosts of a sample of radio galaxies and quasars, we detect Hi in three of the 10 and OH in none of the 14 sources for which useful data were obtained. As expected from our recent result, all of the 21-cm detections occur in sources with ultraviolet (UV) continuum luminosities of LUV≤ 1023WHz-1. At these 'moderate' luminosities, we also obtain four non-detections, although, as confirmed by the equipartition of detections...[Show more]

dc.contributor.authorCurran, S.J.
dc.contributor.authorWhiting, Matthew T
dc.contributor.authorMurphy, M T
dc.contributor.authorWebb, J. K.
dc.contributor.authorBignell, C
dc.contributor.authorPolatidis, A. G.
dc.contributor.authorWiklind, T
dc.contributor.authorFrancis, Paul
dc.contributor.authorLangston, G I
dc.date.accessioned2015-12-10T23:34:48Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/69580
dc.description.abstractFrom a survey for the redshifted Hi 21-cm and OH 18-cm absorption in the hosts of a sample of radio galaxies and quasars, we detect Hi in three of the 10 and OH in none of the 14 sources for which useful data were obtained. As expected from our recent result, all of the 21-cm detections occur in sources with ultraviolet (UV) continuum luminosities of LUV≤ 1023WHz-1. At these 'moderate' luminosities, we also obtain four non-detections, although, as confirmed by the equipartition of detections between the type 1 and type 2 objects, this near-50 per cent detection rate cannot be attributed to unified schemes of active galactic nuclei (AGNs). All of our detections are at redshifts of z≲ 0.67, which, in conjunction with our faint source selection, biases against UV luminous objects. The importance of the UV luminosity (over AGN type) in the detection of the 21-cm absorption is further supported by the non-detections in the two high-redshift (z∼ 3.6-3.8) radio galaxies, which are both type 2 objects, while having LUV > 1023 W Hz-1. Our 21-cm detections in combination with those previously published give a total of eight (associated and intervening) Hi-absorbing sources searched and undetected in OH. Using the detected 21-cm line strengths to normalize the limits, we find that only two of these eight sources may have been searched sufficiently deeply in OH, even though these are marginal.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Galaxies: active; Galaxies: fundamental parameters; Galaxies: high-redshift; Quasars: absorption lines; Radio lines: galaxies; Ultraviolet: galaxies
dc.titleRedshifted Hi and OH absorption in radio galaxies and quasars
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume413
dc.date.issued2011
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationf2965xPUB2064
local.type.statusPublished Version
local.contributor.affiliationCurran, S.J., University of New South Wales
local.contributor.affiliationWhiting, Matthew T, University of New South Wales
local.contributor.affiliationMurphy, M T, University of New South Wales
local.contributor.affiliationWebb, J. K. , University of New South Wales
local.contributor.affiliationBignell, C, National Radio Astronomy Observatory
local.contributor.affiliationPolatidis, A. G. , Max-Planck-Institut für Radioastronomie
local.contributor.affiliationWiklind, T, Space Telescope Science Institute
local.contributor.affiliationFrancis, Paul, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLangston, G I, National Radio Astronomy Observatory
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1165
local.bibliographicCitation.lastpage1173
local.identifier.doi10.1111/j.1365-2966.2011.18209.x
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-02-24T08:21:47Z
local.identifier.scopusID2-s2.0-79955137357
local.identifier.thomsonID000289904600035
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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