TESTING GALAXY FORMATION MODELS WITH THE GHOSTS SURVEY: THE COLOR PROFILE OF M81's STELLAR HALO

We study the properties of the stellar populations in M81's outermost part, which hereafter we will call the stellar halo, using Hubble Space Telescope (HST) Advanced Camera for Surveys observations of 19 fields from the GHOSTS survey. The observed fields probe the stellar halo out to a project...

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Bibliographic Details
Published in:The Astrophysical journal 2013-04, Vol.766 (2), p.1-15
Main Authors: MONACHESI, ANTONELA, Bell, Eric F, RADBURN-SMITH, DAVID J, Vlajic, Marija, de Jong, Roelof S, Bailin, Jeremy, Dalcanton, Julianne J, Holwerda, Benne W, Streich, David
Format: Article
Language:English
Subjects:
Astronomical models
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CAMERAS
COLOR
DIAGRAMS
DISTANCE
FILTERS
Galactic halos
GALAXIES
Galaxy formation
Ghosts
Halos
Hubble Space Telescope
Mathematical models
SATELLITES
STARS
TELESCOPES
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Summary:We study the properties of the stellar populations in M81's outermost part, which hereafter we will call the stellar halo, using Hubble Space Telescope (HST) Advanced Camera for Surveys observations of 19 fields from the GHOSTS survey. The observed fields probe the stellar halo out to a projected distance of ~50 kpc from the galactic center. Each field was observed in both F606W and F814W filters. We compare these results with model predictions for the colors of stellar halos formed purely via accretion of satellite galaxies. When we analyze the cosmologically motivated models in the same way as the HST data, we find that they predict no color gradient for the stellar halos, in good agreement with the observations.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/766/2/106