The infrared source near the rapid-burst X-ray source MXB 1730-335.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1976
- DOI:
- 10.1086/182309
- Bibcode:
- 1976ApJ...210L..83K
- Keywords:
-
- Astronomical Photometry;
- Globular Clusters;
- Infrared Astronomy;
- Radiant Flux Density;
- X Ray Sources;
- Brightness;
- Spectral Energy Distribution;
- Astrophysics