Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224.1007c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Feb. 15, 1987, p. 1007-1011.
Astronomy and Astrophysics
Astrophysics
14
Absorption Spectra, Cooling Flows (Astrophysics), Cosmic Gases, Galactic Clusters, Gas Flow, Gas Temperature, Spectral Line Width, Bl Lacertae Objects, Carbon, Density Distribution, Hydrogen, Quasars, X Ray Spectra
Scientific paper
The X-ray emitting intracluster gas in the cores of many clusters of galaxies is cooling at rates of between 1 and 1000 M_sun;yr-1. Cooled gas is deposited throughout a region of at least 100 kpc radius. The authors estimate total hydrogen column densities for this gas of ≡3×1018 to 1019cm-2 from 21-cm and Hβ observations of the Perseus cluster. The column density of carbon is remarkably similar to that inferred from studies of the intervening metal absorption lines in distant QSOs and BL Lac objects. The authors suggest that many of these absorption systems are due to cooling flows along the line-of-sight. The occurrence of multiple narrow absorption lines in an individual absorption system is explained by filaments suspended in the highly subsonic flow. The covering fraction of cooling flows at cosmological distances is consistent with this interpretation, if all clusters and subclusters contain flows exceeding 100 M_sun;yr-1.
Crawford Carolin S.
Crehan D. A.
Fabian Andrea C.
Johnstone R. M.
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