The IMF at low masses from the CFHT Legacy Survey

Details The IMF at low masses from the CFHT Legacy Survey The IMF at low masses from the CFHT Legacy Survey

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..601r&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

Scientific paper

A detailed comparison between the Besançon model of the Galaxy and the first data release of the CFHTLS-Deep survey is used to constrain the luminosity function and the initial mass function at low masses of the thin disc population. The high number of very red stars found in the sample implies a rather steeply rising IMF from m=0.25 to m=0.1 M&sun;. The resulting LF is in agreement with the local LF. It is in strong disagreement with the Zheng et al. (2001) LF measured from HST deep data. We show that this discrepancy can be understood as an indication of a different IMF at low masses at early epochs of the Galaxy compared to the more recent local thin disc IMF.

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