- Stellar Kinematics in M15
- Gerssen J., van der Marel R.P., Dubath P., Gebhardt K., Guhathakurta P.,
Peterson R., Pryor C.
- BAAS, in press, 2002 (AAS Meeting 199, 56.10)
- © 2001. The American Astronomical Society.
All Rights Reserved.
We are obtaining stellar absorption line spectra with STIS to measure
the radial velocities of individual stars in the crowded central two
arcsec of M15. The central power-law cusp observed in the star count
distribution provides a unique opportunity to probe the structure and
evolution of this globular cluster. The kinematics of the individual
stars will reveal whether the observed cusp is consistent with core
collapse or whether it is indicative of an intermediate-mass black
hole. Initial results show that the few stars that have ground-based
radial velocity measurements agree well with the STIS results, and
that the STIS measurements will significantly increase the overall
number of stars with known radial velocities in the central few arcsec
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Last modified November 15, 2001.
Roeland van der Marel,