The size of the Z = 0.437 H I absorption region toward the QSO 3C 196

Details The size of the Z = 0.437 H I absorption region toward the QSO 3C 196 The size of the Z = 0.437 H I absorption region toward the QSO 3C 196

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..138b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 138-141.

Astronomy and Astrophysics

Astrophysics

12

H I Regions, Intergalactic Media, Quasars, Very Long Base Interferometry, Absorption Spectra, Line Spectra, Molecular Clouds

Scientific paper

VLBI spectral line observations made at the frequency of the z = 0.437 H I absorption line toward the extended radio QSO 3C 196 demonstrate that the absorption does not occur against the more compact continuum structure in this object. Apparently the H I absorption line results from absorption of the lower brightness continuum emission by an intervening cloud with an angular diameter which must be greater than 0.63 arcsec. For a standard cosmology, this corresponds to a linear extent greater than 2.25 kpc. For a spherical cloud, the mass of absorbing gas is near 7 x 10 to the 7th solar masses. Thus this particular QSO absorbing cloud is surprisingly large and massive.

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