The thick disc density law and mass function

Details The thick disc density law and mass function The thick disc density law and mass function

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..293r&link_type=abstract

Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co

Astronomy and Astrophysics

Astrophysics

Scientific paper

The thick disc has probably been formed by a merging event on the thin disc of the Milky Way in its early ages. However the physical conditions in which these stars have been formed are not known. One can reasonnably model the thick disc density law by a double exponential but the determination of the scale height and the local density is problematic due to a degenaracy between these two parameters. Moreover, the determination of the mass function is an important issue in the recent controversy about the universality of the IMF. A large set of star counts, in the visible and the near infrared, are used to determine the density law and the mass function of the thick disc population, by comparing the data with simulations of a synthesis population model. The combination of shallow fields dominated by stars at the turnoff with deep fields allows the first determination of the thick disc mass function on a large mass range.

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