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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731742.0, MPI für Astronomie / Publikationen_mpia
On galactic densitymodeling in the presence of dust extinction
Authors:Bovy, J.; Rix, H.-W.; Green, G. M.; Schlafly, E. F.; Finkbeiner, D. P.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Volume:818
Issue / Number:2
Start Page:id. 130 (11 pp)
Audience:Not Specified
Abstract / Description:Inferences about the spatial density or phase-space structure of stellar populations in the Milky Way require a precise determination of the effective survey volume. The volume observed by surveys such as Gaia or near-infrared spectroscopic surveys, which have good coverage of the Galactic midplane region, is highly complex because of the abundant small-scale structure in the three-dimensional interstellar dust extinction. We introduce a novel framework for analyzing the importance of small-scale structure in the extinction. This formalism demonstrates that the spatially complex effect of extinction on the selection function of a pencil-beam or contiguous sky survey is equivalent to a low-pass filtering of the extinction-affected selection function with the smooth density field. We find that the angular resolution of current 3D extinction maps is sufficient for analyzing Gaia sub-samples of millions of stars. However, the current distance resolution is inadequate and needs to be improved by an order of magnitude, especially in the inner Galaxy. We also present a practical and efficient method for properly taking the effect of extinction into account in analyses of Galactic structure through an effective selection function. We illustrate its use with the selection function of red-clump stars in APOGEE using and comparing a variety of current 3D extinction maps.
Free Keywords:dust; extinction; Galaxy: kinematics and dynamics; Galaxy: structure; methods: data analysis; stars: statistics; surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/0004-637X/818/2/130
URL:http://adsabs.harvard.edu/abs/2016ApJ...818..130B
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