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Title:
H I absorption in radio elliptical galaxies - Evidence for infall
Authors:
van Gorkom, J. H.; Knapp, G. R.; Ekers, R. D.; Ekers, D. D.; Laing, R. A.; Polk, K. S.
Affiliation:
AA(National Radio Astronomy Observatory, Charlottesville, VA; Columbia University, New York), AB(Princeton University Observatory, NJ), AC(National Radio Astronomy Observatory, Charlottesville, VA; CSIRO, Div. of Radio Physics, Epping, Australia), AD(National Radio Astronomy Observatory, Charlottesville, VA; CSIRO, Div. of Radio Physics, Epping, Australia), AE(Royal Greenwich Observatory, Herstmonceux, England)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 708-719. (AJ Homepage)
Publication Date:
03/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, ELLIPTICAL GALAXIES, H LINES, RADIO GALAXIES, ACTIVE GALACTIC NUCLEI, CONTINUOUS RADIATION, FLUX DENSITY, LUMINOSITY, RED SHIFT, VERY LARGE ARRAY (VLA)
DOI:
10.1086/115016
Bibliographic Code:
1989AJ.....97..708V

Abstract

A complete sample of 29 radio galaxies with compact cores has been observed by the VLA in the H I line to an almost uniform optical-depth sensitivity of about 0.01 at a velocity resolution of 40 km/s. These galaxies were selected using continuum observations of an almost complete sample of 49 radio galaxies; 21-cm core flux densities are given for these galaxies. H I absorption was detected in four galaxies, NGC 3894, NGC 5363, 3C 236, and 4C 31.06, bringing to eight the number of radio ellipticals in which H I absorption has been detected. In all cases, absorption is seen redshifted wiht respect to the galaxy's systemic velocity, or close to the systemic velocity, or both. No blueshifted absorption components are seen. These observations demonstrate the infall of H I to the inner regions of radio elliptical galaxies. The estimated infall rates (a few hundredths of a solar mass per year) are more than adequate to fuel the nuclear activity.

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