Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..625e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 2, p. 625-629
Astronomy and Astrophysics
Astrophysics
1
Astronomical Models, Computerized Simulation, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Globular Clusters, Two Dimensional Models, Astronomical Photometry, Galactic Structure, Hubble Space Telescope, Kinematics, Satellite-Borne Photography
Scientific paper
We present measurements of the structural parameters of 24 globular cluster candidates with 19 less than I less than 22, approximately 4 min from NGC 1399, the central giant elliptical galaxy in the Fornax cluster (distance modulus approximately 31). The data were obtained with the Hubble Space Telescope's (HST) Wide Field Camera (WFC) prior to refurbishment. We use a two-dimensional model-fitting technique to take into account the aberrated point-spread function (PSF). This is the first time sizes have been measured for globular clusters in a galaxy beyond the Local Group. The concentration parameters range from 1 less than c less than 2.7, and the core radii from 1 less than rc less than 10 pc. This is the same as the range for globular clusters in our Galaxy. The deduced tidal radii are consistent with recent determinations of the mass of NGC 1399 based on photometric and kinematic profiles.
Elson Rebecca A. W.
Schade David J.
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