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Red Halos Revealed by Surface Photometry
Stockholm University, Faculty of Science, Department of Astronomy.
Department of Physics and Astronomy, Uppsala University.
Stockholm University, Faculty of Science, Department of Astronomy.
2010 (English)In: Hunting for the dark: The hidden side of galaxy formation / [ed] Victor P Debattista, Cristina C Popescu, New York: American Institute of Physics , 2010, Vol. 1240, 305-306 p.Conference paper (Other academic)
Abstract [en]

There are two complementary techniques for studying the luminous halos of galaxies: direct star counts and surface photometry. Star counts can trace the structure of stellar halos out to much larger projected distances, but surface photometry gives a more direct measurement of surface brightness. Curiously, a number of attempts to study the halos of galaxies through optical/near-infrared surface photometry have revealed integrated colours that are too red to be reconciled with the halo properties inferred from the study of resolved stars. We argue that these anomalously red colours can be explained either by a stellar halo population with a bottom-heavy initial mass function, or by dust extinction of extragalactic background light.

Place, publisher, year, edition, pages
New York: American Institute of Physics , 2010. Vol. 1240, 305-306 p.
, AIP Conference Proceedings, 1240
Keyword [en]
Star counts, distribution, and statistics, Photometric, polarimetric, and spectroscopic instrumentation, Luminosity and mass functions, Dwarf galaxies, Magnitudes and colors, luminosities
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-53885DOI: 10.1063/1.3458521OAI: diva2:391534
International Conference in Malta 19-23 Oct 2009
Available from: 2011-01-25 Created: 2011-01-25 Last updated: 2011-01-31Bibliographically approved

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