A Search for Intrinsic HI 21-cm Absorption Toward Compact Radio Sources

Details A Search for Intrinsic HI 21-cm Absorption Toward Compact Radio Sources A Search for Intrinsic HI 21-cm Absorption Toward Compact Radio Sources

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734502g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #345.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a search for intrinsic HI 21 cm and OH 18 cm absorption within the host galaxies of 143 compact radio sources in the redshift range 0.02 < z < 3.8. We use our results on 105 interference-free sources to test two hypotheses: (1) roughly half of compact radio sources show intrinsic 21 cm absorption, and (2) 21 cm absorption is not detected in host galaxies where the active galactic nucleus (AGN) exhibits a high ultraviolet luminosity (greater than 1023 W/Hz; Curran et al. 2008). Despite adequate sensitivity to detect nearly any damped Lyman alpha system and despite successful re-detection of all previously known absorption systems in our sample that were interference-free, we make no new HI 21 cm intrinsic absorption line detections. Our observations do not support the high fraction of intrinsic absorption systems in compact radio source hosts found by previous studies at low redshift. They do, however, support the UV luminosity threshold hypothesis proposed by Curran et al. (2008). We attribute the lack of intrinsic HI absorption in our sample to a selection bias favoring UV-luminous AGN, particularly at high redshift, although the detailed physical reason for the UV luminosity effect on HI absorption remains ambiguous.
Curran, S.J. et al. 2008, MNRAS, 391, 765

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