Discovery of low-redshift, neutral hydrogen absorption in the radio spectrum of PKS 2020-370

Details Discovery of low-redshift, neutral hydrogen absorption in the radio spectrum of PKS 2020-370 Discovery of low-redshift, neutral hydrogen absorption in the radio spectrum of PKS 2020-370

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..683c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. 683-686. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

11

Absorption Spectra, Hydrogen, Quasars, Radio Spectra, Spiral Galaxies, Astronomical Spectroscopy, Galactic Structure, Neutral Gases, Red Shift, Visible Spectrum

Scientific paper

Twenty-one-cm absorption was detected in the radio spectrum of the quasar PKS 2020-370, at a heliocentric velocity of 8611 + or - 5 km/s. The H I gas is coincident in redshift with previously observed Ca II H and K line absorption (Boksenberg et al. 1980) and is close in velocity to the foreground spiral galaxy Klemola 31A. This galaxy lies just 20 arcsec off the line of sight to the distant quasar. The radio and optical spectral characteristics of the absorbing gas are very similar to those found in the 1420 km/s absorption system of 3C 232, which also arise in gas close to a foreground spiral galaxy. The galaxy optical morphology in both systems dictates that one is seeing absorption by gas considerably beyond the optical edge of the spiral, either in a spherical halo of gas enveloping the galaxy (radius of about 16 kpc) or in an extended spiral disk (radius of about 60 kpc).

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