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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731593.0, MPI für Astronomie / Publikationen_mpia
Feeling the pull: a study of natural galactic accelerometers. I. Photometry of the delicate stellar stream of the Palomar 5 globular cluster
Authors:Ibata, R. A.; Lewis, G. F.; Martin, N. F.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Start Page:id. 1 (13 pp)
Audience:Not Specified
Abstract / Description:We present an analysis of wide-field photometric surveys of the Palomar 5 globular cluster and its stellar stream, based on g- and r-band measures together with narrow-band DDO 51 photometry. In this first study, we use the deep (g, r) data to measure the incidence of gaps and peaks along the stream. Examining the star-counts profile of the stream plus contaminating populations, we find no evidence for significant underdensities, and find only a single significant overdensity. This is at odds with earlier studies based on matched-filter maps derived from shallower SDSS data if the contaminating population possesses plausible spatial properties. The lack of substantial substructure along the stream may be used in future dynamical simulations to examine the incidence of dark matter sub-halos in the Galactic halo. We also present a measurement of the relative distances along the stream, which we use to create the deepest wide-field map of this system to date. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institute National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.
Free Keywords:dark matter; Galaxy: halo; Galaxy: kinematics and dynamics; globular clusters: individual: Palomar 5
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/0004-637X/819/1/1
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