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18 February 2025
 
  » arxiv » astro-ph/0107065

 Article overview



A G1-like globular cluster in NGC 1023
Soeren S. Larsen ;
Date 3 Jul 2001
Subject astro-ph
AffiliationUCO / Lick Observatory
AbstractThe structure of a very bright (MV = -10.9) globular cluster in NGC 1023 is analyzed on two sets of images taken with the Hubble Space Telescope. From careful modeling of King profile fits to the cluster image, a core radius of 0.55+/-0.1 pc, effective radius 3.7+/-0.3 pc and a central V-band surface brightness of 12.9+/-0.5 mag / square arcsec are derived. This makes the cluster much more compact than Omega Cen, but very similar to the brightest globular cluster in M31, G1 = Mayall II. The cluster in NGC 1023 appears to be very highly flattened with an ellipticity of about 0.37, even higher than for Omega Cen and G1, and similar to the most flattened clusters in the Large Magellanic Cloud.
Source arXiv, astro-ph/0107065
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