The jumbo galactic globular cluster

Details The jumbo galactic globular cluster The jumbo galactic globular cluster

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5816m&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #58.16; Bulletin of the American Astronomical Society, Vol. 26, p.956

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The mean radial velocities obtained with CORAVEL for 469 individual stars in the galactic globular cluster NGC 5139 are used to derive the velocity dispersion profile. It decreases significantly from the center outwards: the 16 innermost stars, located within 1 arcm from the center, have a velocity dispersion sigp = 21.9 pmm 3.9 kms, when the 16 outermost stars, located between 19.2arcm and 22.4arcm from the center, have a velocity dispersion sigp = 5.1 pmm 1.6 kms. The inner value of about sigpo = 22 kms is the largest velocity dispersion value obtained in the core of any galactic globular cluster. A simultaneous fit of these radial velocities and of the surface brigthness profile to a multimass King-Michie dynamical model provides mean estimates of the total mass equal to Mtot = 5.1 milm, with a corresponding mean mass-to-light ratio mlv = 4.1. The present results emphasize the fact that is not only the brightest but also, by far, the most massive galactic globular cluster.

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