A search for diffuse neutral hydrogen in filaments of galaxies

Details A search for diffuse neutral hydrogen in filaments of galaxies A search for diffuse neutral hydrogen in filaments of galaxies

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178...16a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 16-20. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

1

Cosmology, Galactic Clusters, Hydrogen, Intergalactic Media, Centimeter Waves, Filaments, Neutral Gases, Radio Spectra

Scientific paper

The authors present the results of a search for 21-cm line absorption due to a diffuse neutral hydrogen component associated with filaments of galaxies. Upper limits are given for the 21-cm optical depth at various locations within filaments of the Coma-A1367 and Pisces-Perseus superclusters, the best limit being τ < 2.7×10-4. This limit implies a ratio between MH I, the mass in diffuse H I, and Mgal, the luminous mass in galaxies, MH I/Mgal < 0.005Ts, where Ts is the spin temperature. This result is rather insensitive to the details of the assumed H I structure of the filament.

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