Neutral hydrogen absorption by galaxies and implications for the soft X-ray background

Details Neutral hydrogen absorption by galaxies and implications for the soft X-ray background Neutral hydrogen absorption by galaxies and implications for the soft X-ray background

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356...14c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 14-22.

Astronomy and Astrophysics

Astronomy

10

Absorption Spectra, Hydrogen, Quasars, Spiral Galaxies, X Ray Astronomy, Background Radiation, Continuous Radiation, Galactic Structure, Radio Telescopes, Red Shift, Very Large Array (Vla)

Scientific paper

Results are presented from a search for neutral hydrogen absorption in the 21-cm spectra of 59 radio continuum sources in the proximity of spiral and lenticular galaxies using the Arecibo radio telescope. Five galaxies showed possible but uncertain absorption. For the 54 other sources, the column density of the neutral hydrogen in the intervening material is well below 2 x 10 to the 19th/cu cm or the spin temperature is at least one order of magnitude above the microwave background temperature. For these cases, subthermal effects are not hiding appreciable amounts of neutral hydrogen.

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