The radial velocity signature of the Canis Major dwarf galaxy

Details The radial velocity signature of the Canis Major dwarf galaxy The radial velocity signature of the Canis Major dwarf galaxy

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..565m&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

We present a radial velocity survey of the Canis Major dwarf galaxy recently discovered at the edge of the Galactic disk. Using the AAT/2dF multi-fiber spectrograph, we obtained radial velocities for over 1500 red giant branch (RGB) and red clump (RC) stars belonging to this stellar structure. The less contaminated RGB sample reveals a kinematically cold population with a radial velocity dispersion that is as low as 11-1+3 km/s, typical of accretion process, while the more numerous RC stars from Canis Major follow a distance -- radial velocity relation that is unexpected for disk stars. These kinematic data confirm the extra-Galactic nature of this population.

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