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How to form bulges/ellipticals in dark halos as fast as central black holes?

Published online by Cambridge University Press:  01 July 2007

Hong Sheng Zhao ,
Bing-Xiao Xu  and
Xue-Bing Wu
Hong Sheng Zhao
Affiliation:
SUPA, University of St Andrews, KY16 9SS, Fife, U.K.
Bing-Xiao Xu
Affiliation:
Department of Astronomy, Peking University, 100871 Beijing, China Email: [email protected], [email protected], [email protected]
Xue-Bing Wu
Affiliation:
Department of Astronomy, Peking University, 100871 Beijing, China Email: [email protected], [email protected], [email protected]
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Abstract

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Gravity is nearly a universal constant in the cusp of an NFW galaxy halo. Inside this external field an isothermal gas sphere will collapse and trigger a starburst if above a critical central pressure. Thus formed spheroidal stellar systems have Sersic-profile and satisfy the Faber-Jackson relation. The process is consistent with observed starbursts. We also recover the MBH − σ* relation, if the gas collapse is regulated or resisted by the feedback from radiation from the central BH.

Keywords

black hole physics – galaxies: formation – galaxies: starburst – galaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 15 - 18
Copyright
Copyright © International Astronomical Union 2008

References

Elmegreen, B. G. 1999, ApJ, 517, 103493Google Scholar
Xu, B. X. & Wu, X. B. 2007, ApJ, 667, 92Google Scholar
Xu, B. X., Wu, X. B., & Zhao, H. S. 2007, ApJ, 664, 198Google Scholar