Structural and Dynamical Properties of 29 Galactic Globular Clusters

Details Structural and Dynamical Properties of 29 Galactic Globular Clusters Structural and Dynamical Properties of 29 Galactic Globular Clusters

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jass...14..179s&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 14, no. 2, p. 179-193.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We use B band CCD images to investigate the surface brightness distributions and dynamical properties of 29 Galactic globular clusters. Model fits suggest that 22 clusters show King type surface brightness profiles, while 7 clusters are characterized by power law cusp profiles. For the King type clusters, concentration parameters (c = log(rt =rc)) range from 1.20 to 2.10, and core radii are 0.4 to 1.9 pc. The mean value of power law slopes of 7 cuspy clusters was estimated as ¥á = 1.011 +/- 0.065. Total masses of King type globular clusters are in the range of 1.7 x 104M to 1.0 x 106M with a mean of 1.7 x 105M . A significant positive correlation between mass and mass-to-light ratio of King type globular clusters has been confirmed with a Pearson's correlation coefficient r = 0.52 and a confidence level of 99%. Our data also confirm a linear relation between total mass and absolute magnitude of King type globular clusters.

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