Detection of a Collapsed Core in the Globular Cluster NGC 7099

Details Detection of a Collapsed Core in the Globular Cluster NGC 7099 Detection of a Collapsed Core in the Globular Cluster NGC 7099

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2910s&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #29.10; Bulletin of the American Astronomical Society, Vol. 24, p.774

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution images of the prototypical collapsed core globular cluster NGC 7099 reveal a core structure of ~ 2.2'' radius. This conflicts with previous measurements which found an unresolved cusp. The new observations are superior because they used a special photon counting camera and high resolution processing to achieve ~ 0.35'' resolution. The measured radius is commensurate with the oscillating core sizes predicted by computer simulations. The cluster's reverse color cradient is more difficult to interpret, but suggests that the presumed cluster center has previously been placed directly on a red giant, thus producing the cusp effect seen with normal imaging.

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