2002A&A...381..219D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.22CEST03:55:10

2002A&A...381..219D - Astronomy and Astrophysics, volume 381, 219-226 (2002/1-1)

Low-extinction windows in the inner Galactic Bulge.

DUTRA C.M., SANTIAGO B.X. and BICA E.

Abstract (from CDS):

We built K band extinction maps in the area of two candidate low-extinction windows in the inner Bulge: W0.2-2.1 at (l, b)=(0.25°, -2.15°), and W359.4-3.1 at (l, b)=(359.40°, -3.10°). We employed JHKs photometry from the 2MASS Point Source Catalog. Extinction values were determined by fitting the upper giant branch found in the present 2MASS Ks (J-Ks) diagrams to a de-reddened bulge stellar population reference giant branch. We tested the method on the well known Baade's and Sgr I windows: the 2MASS mean extinction values in these fields agreed well with those of previous studies. We confirm the existence of low-extinction windows in the regions studied, as local minima in the AK maps reaching AK values about 2 standard deviations below the mean values found in the neighbouring areas. Schlegel et al.'s (1998ApJ...500..525S) FIR extinction maps, which integrate dust contributions throughout the Galaxy, are structurally similar to those derived with 2MASS photometry in the two studied windows. We thus conclude that the dust clouds affecting the 2MASS and FIR maps in these directions are basically the same and are located on foreground of the bulk of bulge stars. However, the AK absolute values differ significantly. In particular, the FIR extinction values for W359.4-3.1 are a factor ≃1.45 larger than those derived from the 2MASS photometry. Possible explanations of this effect are discussed. The lower Galactic latitudes of the low-extinction windows W359.4-3.1 and W0.2-2.1, as compared to Baade's Window, make them promising targets for detailed studies of more central bulge regions.

Abstract Copyright:

Journal keyword(s): Galaxy: interstellar medium: dust

CDS comments: The 2 windows W359.4-3.1 and W0.2-2.1 are not in SIMBAD.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LDN 43 DNe 16 34 29.3 -15 47 11           ~ 137 1
2 [DB2002b] G357.29+0.93 DNe 17 35.3 -30 44           ~ 4 0
3 LDN 1769 DNe 17 41.4 -30 17           ~ 3 0
4 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12116 0
5 TGU H2190 P1 DNe 17 48.8 -31 51           ~ 4 0
6 LDN 1801 DNe 17 50.2 -29 31           ~ 3 0
7 [DB2002b] G357.23-3.40 DNe 17 52.6 -33 04           ~ 3 0
8 LDN 1788 DNe 17 53.2 -30 41           ~ 4 0
9 LDN 1795 DNe 17 54.1 -30 31           ~ 3 1
10 NAME Sgr I Window reg 17 56 -29.0           ~ 64 0
11 LDN 1783 DNe 17 58.2 -31 30           ~ 4 0
12 LDN 48 DNe 17 58.2 -29 00           ~ 3 0
13 [DB2002b] G359.57-3.63 DNe 17 59.0 -31 09           ~ 3 0
14 LDN 3 DNe 18 03.2 -31 00           ~ 3 0
15 NAME Baade Window reg 18 03.5 -30 01           ~ 553 3
16 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 470 1
17 NAME Sgr II Window reg 18 12 -27.9           ~ 18 0
18 NAME Galactic Bulge reg ~ ~           ~ 3566 0

    Equat.    Gal    SGal    Ecl

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2021.04.22-03:55:10

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