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J/PAZh/36/615     3D reddening map for stars from 2MASS phot. (Gontcharov, 2010)

Three-dimensional reddening map for stars from 2MASS photometry: The method and the first results. Gontcharov G.A. <Pis'ma Astron. Zh. 36, 615 (2010)> =2010PAZh...36..615G (SIMBAD/NED BibCode) =2010AstL...36..584G
ADC_Keywords: Extinction ; Interstellar medium ; Milky Way ; Reddening Keywords: color-magnitude diagram - interstellar medium - Galactic solar neighborhoods - dark clouds - stellar reddening - interstellar extinction - baryonic dark matter Abstract: A three-dimensional reddening map for stars within 1100pc of the Sun are presented. Analysis of the distribution of 70 million stars from the 2MASS catalog with the most accurate photometry on the (J-Ks)-Ks diagram supplemented with Monte Carlo simulations has shown that one of the maxima of this distribution corresponds to F-type dwarfs and subgiants with a mean absolute magnitude MKs=2.5m. The shift of this maximum toward large (J-Ks) with increasing Ks reflects the reddening of these stars with increasing heliocentric distance. The distribution of the sample of stars over Ks, l, and b cells with a statistically significant number of stars in each cell corresponds to their distribution over three-dimensional spatial cells. As a result, the reddening E(J-Ks) has been determined with an accuracy of 0.03m for spatial cells with a side of 100pc. All of the known large absorbing clouds within 1100pc of the Sun have manifested themselves in the results obtained. The absorbing matter of the Gould Belt is shown to manifest itself at latitudes up to 40° and within 600pc of the Sun. The size and influence of the Gould Belt may have been underestimated thus far. The absorbing matter at latitudes up to 60° and within 1100pc of the Sun has been found to be distributed predominantly in the first and second quadrants in the southern hemisphere and in the third and fourth quadrants in the northern hemisphere. The E(B-V) should be used together with Rv from Gontcharov (2012AstL...38...12G, Cat. J/PAZh/38/15) and Av from Gontcharov (2012AstL...38...87G, Cat. J/PAZh/38/108). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file xyzebv.dat 23 630109 E(B-V) tabulated as a function of X, Y, Z coordinates
See also: I/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/PAZh/38/15 : Total-to-selective extinction ratio within 700pc (Gontcharov, 2012) J/PAZh/38/776 : Complete sample of OB stars within 350pc (Gontcharov, 2012) J/PAZh/38/108 : 3D interstellar extinction map within the nearest kiloparsec (Gontcharov, 2012) Byte-by-byte Description of file: xyzebv.dat
Bytes Format Units Label Explanations
1- 5 I5 pc X [-1200,1200] X rectangular galactic coordinate 7- 11 I5 pc Y [-1200,1200] Y rectangular galactic coordinate 13- 16 I4 pc Z [-600,600] Z rectangular galactic coordinate 18- 23 F6.3 mag E(B-V) [-0.007,0.845] E(B-V) reddening (1)
Note (1): The E(B-V) are calculated in this paper for nearly a space of 2400pc along X, 2400pc along Y and 1200pc along Z centered at the Sun and presented as the values for the cubes of 20x20x20pc. It should be interpolated between the centres of the cubes.
Acknowledgements: George Gontcharov, georgegontcharov(at)yahoo.com History: * 08-Jul-2016: First on-line table * 15-Sep-2016: Corrected table from author
(End) George Gontcharov [Pulkovo Obs.], Patricia Vannier [CDS] 15-Sep-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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