Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..343f&link_type=abstract
Nature (ISSN 0028-0836), vol. 307, Jan. 26, 1984, p. 343. Research supported by the Royal Society.
Astronomy and Astrophysics
Astrophysics
9
Elliptical Galaxies, Radio Galaxies, Star Clusters, Cooling, Cooling Flows (Astrophysics), Galactic Clusters, Galactic Nuclei, Gas Flow, Heao 2, Luminosity, Stellar Evolution
Scientific paper
It is shown that the back-reaction of the nuclear luminosity of the elliptical radio galaxy M87 on the flow of gas into the nucleus is small unless M87 was much brighter in the past. The ionization equilibrium of gas in a cooling flow was calculated numerically by iterating the effects of photoabsorption and collisional ionization due to X-rays from the gas as well as from a nuclear X-ray source. The important bound-bound, bound-free, and free-free radiative processes above a million K of H, C, N, O, S, Si, and Fe were included in the calculations. The density and temperature of successive radio shells of gas were interpolated and extrapolated into the center assuming constant pressure and mass flow rate. From the results, it is suggested that massive central star clusters may be common in the central galaxies in many clusters and, on a smaller scale, in many elliptical galaxies.
Canizares Calude R.
Fabian Andrea C.
Itoh Hideo
Nulsen Paul E. J.
Stewart Gordon C.
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