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The Red Halos of Galaxies

Published online by Cambridge University Press:  01 August 2006

Erik Zackrisson ,
Nils Bergvall ,
Göran Östlin ,
Genoveva Micheva  and
Brady Caldwell
Erik Zackrisson
Affiliation:
Tuorla Observatory, Väisäläntie 20, FIN-21500 Piikkiö, Finland, email: ez@astro.uu.se Department of Astronomy and Space Physics, Box 515, 751 20 Uppsala, Sweden
Nils Bergvall
Affiliation:
Department of Astronomy and Space Physics, Box 515, 751 20 Uppsala, Sweden
Göran Östlin
Affiliation:
Stockholm Observatory, AlbaNova University Center, 106 91 Stockholm, Sweden
Genoveva Micheva
Affiliation:
Stockholm Observatory, AlbaNova University Center, 106 91 Stockholm, Sweden
Brady Caldwell
Affiliation:
Department of Astronomy and Space Physics, Box 515, 751 20 Uppsala, Sweden
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Abstract

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Optical and near-IR surface photometry of the halos of disk galaxies and blue compact galaxies have revealed a very red spectral energy distribution, which cannot easily be reconciled with any normal type of stellar population. Using spectral evolutionary models, we demonstrate that a stellar population with an extremely bottom-heavy initial mass function can explain the red halos of both types of objects. Because of its very high mass-to-light ratio, this halo population may account for some of the missing baryons in the local Universe.

Keywords

galaxies: halosgalaxies: stellar contentdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 148
Copyright
Copyright © International Astronomical Union 2007

References

Bergvall, N. & Östlin, G. 2002, A&A 390, 891.Google Scholar
Bergvall, N., Marquart, T., Persson, C., Zackrisson, E., & Östlin, G. 2005, in: Renzini, A., & Bender, R. (eds.), Multiwavelength mapping of galaxy formation and evolution (Berlin: Springer), p. 355.CrossRefGoogle Scholar
Zackrisson, E., Bergvall, N., Östlin, G., Micheva, G., & Leksell, M. 2006, ApJ 650, 812.CrossRefGoogle Scholar
Zibetti, S., White, S. D. M. & Brinkmann, J. 2004, MNRAS 347, 556.CrossRefGoogle Scholar