Red Halos Revealed by Surface Photometry

Details Red Halos Revealed by Surface Photometry Red Halos Revealed by Surface Photometry

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..305z&link_type=abstract

HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen

Statistics

Stars, Photometry, Stellar Mass, Galaxies, Brightness, Star Counts, Distribution, And Statistics, Photometric, Polarimetric, And Spectroscopic Instrumentation, Luminosity And Mass Functions, Dwarf Galaxies, Magnitudes And Colors, Luminosities

Scientific paper

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.

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