Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360508n&link_type=abstract
American Astronomical Society, AAS Meeting #213, #605.08
Astronomy and Astrophysics
Astronomy
Scientific paper
The Galactic globular cluster M54 lies at the center of the tidally disrupted Sagittarius dwarf galaxy. It is still not clear if M54 is actually the nucleus of the galaxy. We present two types of velocity measurements for this object. First, we use GMOS at GEMINI-south to obtain individual radial velocities for 500 stars. We do this, by combining a custom mask with a narrow filter which allows to fit about 900 slits in a single exposure. We also use the GNIRS-IFU at GEMINI-south, to obtain a velocity map for a 5"x5" field of view on the cluster center, which we measured using the CO band head. We show that the use of K-band IFU data allows to easily exclude the hottest brightest stars from the measurements. The combination of these two datasets indicates that the rotational velocity increases from the outskirts to the center of the cluster. The central value of v/sigma approaches unity. We combine the kinematical measurements with previously obtained photometry from HST in order to carry out orbit-based models, with the aim of testing if the observed velocity rise is due to a concentration of dark remnants or to the presence of an intermediate-mass black hole.
Bergmann Marcel
Gebhardt Karl
Noyola Eva
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