Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299..567k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 2, pp. 567-574.
Astronomy and Astrophysics
Astronomy
8
Dust, Extinction, Planetary Nebulae: General, Galaxy: Structure, Galaxies: Fundamental Parameters, Galaxies: Ism
Scientific paper
Planetary nebulae of the Galactic bulge are used as background sources to probe the extinction in the disc. A systematic decrease of the extinctions with galactic latitude is found, as well as a genuine scatter about the mean relation. Both are well accounted for by a model of small clouds randomly distributed in an exponential disc similar to the gas disc, with average cloud extinctions taken from the classical models derived from solar neighbourhood stars. The latter models thus also provide an excellent description for the global extinction of the disc. The pole-to-pole extinction of the Milky Way is found to be A_V=1.4, and in the plane one has A_V=27 to the centre, in agreement both with far-IR studies and with individual external galaxies. This indicates that our Galaxy is optically thin, a property shared with other spirals. Observable properties of galactic discs with our extinction model, as would be seen in external galaxies, are presented.
Köppen Joachim
Vergely Jean-Luc
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