Query : 2013A&A...550A..42C

2013A&A...550A..42C - Astronomy and Astrophysics, volume 550A, 42-42 (2013/2-1)

Three-dimensional interstellar extinction map toward the Galactic bulge.


Abstract (from CDS):

Studies of the properties of the inner Galactic bulge strongly depend on the assumptions made about interstellar extinction. Most of the extinction maps available in the literature lack the information about the distance. We combine observations with the Besancon model of the Galaxy to investigate the variations of extinction along different lines of sight toward the inner Galactic bulge as a function of distance. In addition we study the variations in the extinction law in the bulge. We constructed color-magnitude diagrams with the following sets of colors: H-Ks and J-Ks from the VVV catalog and Ks-[3.6], Ks-[4.5], Ks-[5.8] and Ks-[8.0] from GLIMPSE-II catalog matched with 2MASS. Using the newly derived temperature-color relation for M giants that match the observed color-magnitude diagrams better we then used the distance-color relations to derive the extinction as a function of distance. The observed colors were shifted to match the intrinsic colors in the Besancon model as a function of distance, thereby iteratively creating an extinction map with three dimensions: two spatial and one distance dimension along each line of sight toward the bulge. Color excess maps are presented at a resolution of 15'x15' for six different combinations of colors in distance bins of 1kpc. The high resolution and depth of the photometry allows us to derive extinction maps to 10 kpc distance and up to 35mag of extinction in AV (3.5mag in AKs). Integrated maps show the same dust features and consistent values with the other 2D maps. Starting from the color excess between the observations and the model, we investigate the extinction law in near-infrared and its variation along different lines of sight.

Abstract Copyright:

Journal keyword(s): dust, extinction - Galaxy: bulge - Galaxy: stellar content - Galaxy: structure

VizieR on-line data: <Available at CDS (J/A+A/550/A42): table1.dat table2.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13898 0
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4218 3
3 NAME Baade Window reg 18 03.5 -30 01           ~ 595 3
4 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 513 0
5 NAME Galactic Bulge reg ~ ~           ~ 4167 0

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