J/MNRAS/338/253 K extinction near the Galactic Centre (Dutra+, 2003)
Extinction within 10 degrees of the Galactic Centre using 2MASS
Dutra C.M., Santiago B.X., Bica E.L.D., Barbuy B.
<Mon. Not. R. Astron. Soc. 338, 253 (2003)>
=2003MNRAS.338..253D 2003MNRAS.338..253D
ADC_Keywords: Interstellar medium ; Extinction ; Infrared sources
Keywords: The Galaxy - interstellar medium - extinction - dust
Description:
We extract J and Ks magnitudes from the 2MASS Point Source Catalog
for approximately 6 million stars with 8<Ks<13 in order to
build an AK extinction map within 10 degrees of the Galactic centre.
The extinction was determined by fitting the upper giant branch of
(Ks, J-Ks) colour-magnitude diagrams to a dereddened upper giant
branch mean locus built from previously studied Bulge fields. The
extinction values vary from A_K=0.05 in the edges of the map up to
A_K=3.2 close to the Galactic centre.
The resulting extinction map is given in the file 'extmap.dat'.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
extmap.dat 30 32761 Extinction map (181 x 181 points)
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See also:
B/2mass : The 2MASS database (IPAC/UMass, 2000)
II/62 : Catalogue of Extinction Data (Neckel+, 1980)
II/114 : UV Interstellar Extinction (Savage+ 1985)
J/A+A/349/L69 : Interstellar extinction towards inner Galactic Bulge
(Schultheis+, 1999)
J/A+A/359/347 : Reddening in open and globular clusters (Dutra+, 2000)
J/A+A/383/631 : Catalogue of dust clouds in the Galaxy (Dutra+, 2002)
Byte-by-byte Description of file: extmap.dat
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Bytes Format Units Label Explanations
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1- 6 F6.3 deg GLON [-6/6] Galactic longitude of the cell centre
9- 14 F6.3 deg GLAT [-6/6] Galactic latitude of the cell centre
16- 22 F7.3 mag AK K band extinction
25- 30 F6.3 mag e_AK Error in extinction determination
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Acknowledgements: Carlos Dutra
References:
Dutra et al., Low-extinction windows in the inner Galactic Bulge,
2002A&A...381..219D 2002A&A...381..219D
(End) Patricia Bauer [CDS] 24-Sep-2002