Redshifted H I and OH absorption in radio galaxies and quasars

• 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 L(UV) 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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

sky survey

ultraviolet: galaxies

fundamental constants

unified schemes

galaxies: fundamental parameters

absorption

optical-spectra

high-redshift

active galactic nuclei

red quasars

galaxies

absorbing gas

21 cm absorption

galaxies: active

quasars: absorption lines

radio lines: galaxies

flat-spectrum sample

molecular

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