The kinematics of the intermediate-age halo of Local Group galaxy NGC 6822

Details The kinematics of the intermediate-age halo of Local Group galaxy NGC 6822 The kinematics of the intermediate-age halo of Local Group galaxy NGC 6822

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...72d&link_type=abstract

NOAO Proposal ID #2002B-0072

Physics

Scientific paper

Our CFHT R,I,CN and TiO photometric survey, specifically designed to identify intermediate-age carbon stars, has revealed that NGC 6822 possesses a huge intermediate-age ``halo''. An old halo has been seen around a few Local Group dwarfs (Minniti et al. 1999; Minniti & Zijlstra 1997) but never before an intermediate-age halo. The goal of this proposal is to obtain the radial velocity of ~ 900 C stars to establish their kinematics properties to determine if they belong to a pressure supported halo or if they are members of a thick disk also in rotation somewhat like the HI. The analysis of the kinematics of these stars is an essential step to explain the origin of such ``halo''.

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