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Free access article

Issue A&A
Volume 409, Number 1, October I 2003
Page(s) 205 - 215
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20031070



A&A 409, 205-215 (2003)
DOI: 10.1051/0004-6361:20031070

Research Note

A three-dimensional Galactic extinction model

R. Drimmel1, A. Cabrera-Lavers2 and M. López-Corredoira3

1  Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy
2  Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain
3  Astronomisches Institut der Universität Basel, Venusstrasse 7, 4102 Binningen, Switzerland

(Received 2 May 2003 / Accepted 2 July 2003 )

Abstract
A large-scale three-dimensional model of Galactic extinction is presented based on the Galactic dust distribution model of Drimmel & Spergel (2001). The extinction AV to any point within the Galactic disk can be quickly deduced using a set of three-dimensional Cartesian grids. Extinctions from the model are compared to empirical extinction measures, including lines-of-sight in and near the Galactic plane using optical and NIR extinction measures; in particular we show how extinction can be derived from NIR color-magnitude diagrams in the Galactic plane to a distance of 8 kiloparsec.


Key words: dust, extinction -- ISM: structure -- Galaxy: structure

Offprint request: R. Drimmel, drimmel@to.astro.it

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