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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 358878.1, MPI für Astronomie / Publikationen_mpia
GHOSTS: the resolved stellar outskirts of massive disk galaxies
Authors:de Jong, Roelof S.; Seth, A. C.; Bell, E. F.; Brown, T. M.; Bullock, J. S.; Courteau, S.; Dalcanton, J. J.; Ferguson, H. C.; Goudfrooij, P.; Holfeltz, S.; Purcell, C.; Radburn-Smith, D.; Zucker, D.2007
Publisher:Cambridge Univ. Press
Place of Publication:Cambridge
Date of Publication (YYYY-MM-DD):2007
Title of Proceedings:Stellar Populations as Building Blocks of Galaxies
Start Page:503
End Page:504
Title of Series:IAU Symposium
Volume (in Series):241
Review Status:not specified
Audience:Experts Only
Abstract / Description:We show initial results from our ongoing HST GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos and thick disks of galaxies are formed by accretion of minor satellites and therefore contain valuable information about the (early) assembly process of galaxies. We detect for the first time the very small halo of NGC4244, a low mass edge-on galaxy. We find that massive galaxies have very extended halos, with equivalent surface brightnesses of 28-29 V-mag/arcsec^2 at 20-30 kpc from the disk. The old RGB stars of the thick disk in the NGC891 and NGC4244 edge-on galaxies truncate at the same radius as the young thin disk stars, providing insights into the formation of both disk truncations and thick disks. We furthermore present the stellar populations of a very low surface brightness stream around M83, the first such a stream resolved into stars beyond those of the Milky Way and M31.
Free Keywords:Astrophysics
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2007astro.ph..2168D [ID No:1]
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