SIMBAD references

2011MNRAS.413.1165C - Mon. Not. R. Astron. Soc., 413, 1165-1173 (2011/May-2)

Redshifted H I and OH absorption in radio galaxies and quasars.

CURRAN S.J., WHITING M.T., MURPHY M.T., WEBB J.K., BIGNELL C., POLATIDIS A.G., WIKLIND T., FRANCIS P. and LANGSTON G.

Abstract (from CDS):

From a survey for the redshifted H I 21-cm and OH 18-cm absorption in the hosts of a sample of radio galaxies and quasars, we detect H I 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 ≤ 1023 W.Hz–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) H I-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.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: active - galaxies: fundamental parameters - galaxies: high-redshift - quasars: absorption lines - radio lines: galaxies - ultraviolet: galaxies

Simbad objects: 24

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2019.10.22-17:05:37

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