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Low-extinction windows in the inner Galactic Bulge

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Low-extinction windows in the inner Galactic Bulge

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Título Low-extinction windows in the inner Galactic Bulge
Autor Dutra, Carlos Maximiliano
Santiago, Basilio Xavier
Bica, Eduardo Luiz Damiani
Abstract 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 JH Ks 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 elds 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 (1998) 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.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 381, no. 1 (Jan. 2002), p. 219-226
Assunto Astronomia infravermelha
Fotometria astronômica
Galaxia
Materia interestelar
Poeira cosmica
[en] Galaxy: interstellar medium: dust
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98499
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