The Milky Way's External Disk Constrained by Star Counts in the Near Infrared

Details The Milky Way's External Disk Constrained by Star Counts in the Near Infrared The Milky Way's External Disk Constrained by Star Counts in the Near Infrared

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..215r&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

We use the stellar population synthesis model of the Galaxy, developed in Besançon, along with the Two Micron All Sky Survey (2MASS) to constrain the Galactic structure of the external disk, and in particular the warp. The external disk parameters such as its scale length and the slope of the warp are adjusted by comparing 2MASS star counts with the simulated ones from the Galactic model. In order to properly interpret the observations, the simulated stars are reddened using a three dimensional extinction map. We derive new parameters for the stellar warp and find it to be asymmetric.

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