Extreme Mass Segregation in the Core of 47 Tucanae (NGC 104): Bonus of an HST Planetary Search

Details Extreme Mass Segregation in the Core of 47 Tucanae (NGC 104): Bonus of an HST Planetary Search Extreme Mass Segregation in the Core of 47 Tucanae (NGC 104): Bonus of an HST Planetary Search

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4108h&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #41.08; Bulletin of the American Astronomical Society, Vol. 32, p.740

Astronomy and Astrophysics

Astronomy

Scientific paper

The 8.3 d HST experiment described by R. L. Gilliland, et al. (see their poster) is aimed at detecting planetary transits in the globular cluster 47 Tucanae. An important by-product is a set of extremely deep WFPC2 images in F555W (V) and F814W (I) of the dense cluster core region. The effective exposure times in each of these bands is over 100,000 s, and extensive sub-pixel dithers between individual exposures supports the creation of 4x oversampled images in which the FWHM of the point spread function is < ~70 mas (PC) and < ~140 mas (WF CCDs). Limited use is made of the shorter exposure time F336W (U) data. This poster describes a study of mass segregation in the core of 47 Tuc using this extremely deep WFPC2 data set. Luminosity functions are constructed in a sequence of radial bins, and are compared with theoretical luminosity functions (Bergbusch & VandenBerg 1992) based on a variety of power-law stellar mass functions. The degree of mass segregation is characterized by the slope x of the best fitting stellar mass function, where x=+1.35 is the Salpeter value. The mass function slope is found to vary from x ~-5 in the cluster center to x ~-2 at the edge of the WFPC2 field of view, r ~100'', indicating extreme mass segregation in the core of 47 Tuc. The results are coupled with image simulations and results derived from a set of archival short WFPC2 exposures to assess the effect of faint end incompleteness in the latter data set. Funding has been provided via a NASA/STScI grant for GO-8267.

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