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Self-regulated cooling flows in elliptical galaxies and in cluster cores - Is exclusively low mass star formation really necessary?

Silk, Joseph and Djorgovski, S. and Wyse, Rosemary F. G. and Bruzual A., Gustavo (1986) Self-regulated cooling flows in elliptical galaxies and in cluster cores - Is exclusively low mass star formation really necessary? Astrophysical Journal, 307 . pp. 415-426. ISSN 0004-637X. doi:10.1086/164430.

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A self-consistent treatment of the heating by supernovae associated with star formation in a spherically symmetric cooling flow in a cluster core or elliptical galaxy is presented. An initial stellar mass function similar to that in the solar neighborhood is adopted. Inferred star-formation rates, within the cooling region - typically the inner 100 kpc around dominant galaxies at the centers of cooling flows in XD clusters - are reduced by about a factor of 2, relative to rates inferred when the heat input from star formation is ignored. Truncated initial mass functions (IMFs) are also considered, in which massive star formation is suppressed in accordance with previous treatments, and colors are predicted for star formation in cooling flows associated with central dominant elliptical galaxies and with isolated elliptical galaxies surrounded by gaseous coronae. The low inferred cooling-flow rates around isolated elliptical galaxies are found to be insensitive to the upper mass cutoff in the IMF, provided that the upper mass cutoff exceeds 2 M⊙. Comparison with observed colors favors a cutoff in the IMF above 1 M⊙ in at least two well-studied cluster cooling flows, but a normal IMF cannot be excluded definitively. Models for NGC 1275 support a young (≾ 3 Gyr) cooling flow. As for the isolated elliptical galaxies, the spread in colors is consistent with a normal IMF. A definitive test of the IMF arising via star formation in cooling flows requires either UV spectral data or supernova searches in the cooling-flow-centered galaxies.

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Djorgovski, S.0000-0002-0603-3087
Additional Information:© 1986 The American Astronomical Society. Received 1985 July 8; accepted 1985 September 18. We thank Ed Bertschinger and Paul Nulsen for several helpful comments on an earlier draft of this paper. This research has been supported in part by NASA under grant NGR 05-003-578 and by Cal Space.
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NASANGR 05-003-578
California Space InstituteUNSPECIFIED
Subject Keywords:galaxies: clustering — galaxies: stellar content — intergalactic medium — stars: formation — stars: supernovae
Record Number:CaltechAUTHORS:20190731-153336036
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97565
Deposited By: Tony Diaz
Deposited On:31 Jul 2019 22:49
Last Modified:16 Nov 2021 17:32

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