Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210l..83k&link_type=abstract
Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 2, p. L83-L86.
Astronomy and Astrophysics
Astronomy
46
Astronomical Photometry, Globular Clusters, Infrared Astronomy, Radiant Flux Density, X Ray Sources, Brightness, Spectral Energy Distribution
Scientific paper
Photometry at 1-5 microns shows that the faint optical source inferred to be a globular cluster associated with MXB 1730-335 is indeed one of the most highly concentrated globular clusters known, with a core diameter of 13 plus or minus 1 sec (0.6 pc at 10 kpc). Its central surface brightness is 0.6 mag brighter than the next brightest globular cluster, NGC 6440, which is also associated with an X-ray source. The surface brightness and core radius of the globular cluster associated with MXB 1730-335 indicate a central density of 4 x 10 to the 5th solar masses/cu pc, a central escape velocity of 60 km/s, and a relaxation time of 4 x 10 to the 7th years.
Kleinmann Douglas E.
Kleinmann Susan G.
Wright Louis E.
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