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Title: Constraining galactic structure parameters from a new extinction model and four star count samples
Author: Chen, B.
Figueras Siñol, Francesca
Torra Roca, Jorge
Jordi i Nebot, Carme
Luri Carrascoso, Xavier
Galadí-Enríquez, David
Keywords: Estels
Cúmuls de galàxies
Estadística matemàtica
Clusters of galaxies
Mathematical statistics
Issue Date: Nov-1999
Publisher: EDP Sciences
Abstract: We propose a new 3-dimensional extinction model based on the COBE/IRAS all sky reddening map. Its application to globular and open cluster data evidences that the COBE/IRAS reddening map has an accuracy of 18%, but overestimates visual absorption by a factor of 1.16. This systematic error does not change with galactic latitude and opacity significantly. The implementation of the new extinction model has optimized our galactic structure and kinematic model to low-galactic latitudes. Four star count samples distributed in different galactic directions have been compared with galactic model simulations. Numerical experiments allow us to constrain the radial distribution of the galactic disk. The disk scale length is found to be 2250 +/- 50 pc and the displacement of the Sun from the galactic plane ZSun = 27.5 +/- 6.0 pc.
Note: Reproducció del document publicat a:
It is part of: Astronomy & Astrophysics, 1999, vol. 352, num. 2, p. 459-468
ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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