Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..733f&link_type=abstract
Nature (ISSN 0028-0836), vol. 310, Aug. 30, 1984, p. 733-740. Research supported by the Royal Society.
Astronomy and Astrophysics
Astrophysics
358
Cooling Flows (Astrophysics), Galactic Clusters, Gas Cooling, Gas Flow, Interstellar Gas, Mass Flow Rate, X Ray Sources, Gas Temperature, High Temperature Gases, Intergalactic Media, Optical Emission Spectroscopy, Quasars, Temperature Profiles, Thermal Instability, Ultraviolet Spectroscopy, X Ray Spectroscopy
Scientific paper
Cooling gas in the center of many clusters of galaxies is compressed and pushed inward by the thermal pressure of the hot, uncooled outer gas. Gravity acts as a focusing agent until the gas has cooled to galactic temperatures. The cooling process is thermally unstable, giving rise to optical filamentation. Once the gas cools below 10.000 K it presumably forms stars which add to the mass of a central galaxy. Accretion rates of up to 400 solar masses/yr are inferred from X-ray measurements so that the mass of such central galaxies may be due to cooling flows. Their optical and UV appearance emphasize that the gas predominantly turns into low-mass stars with an initial mass function unlike that of the solar neighborhood. Optical and X-ray observations of cooling flows can be used to investigate the continuing formation of the largest known galaxies.
Canizares Calude R.
Fabian Andrea C.
Nulsen Paul E. J.
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