Uhuru observations of an X-ray burst at high galactic latitude centered on the X-ray globular cluster NGC 1851.
Abstract
An X-ray burst from a 0.5 x 10 deg region centered near NGC 1851 (MX 0513-40) was detected in observations made with the Uhuru X-ray observatory on September 19, 1972. The source was observed for 15 seconds with a peak rate of 0.5 that of the Crab (2-6 keV) and was not detected above 0.01 of the Crab in observations 4.5 minutes before or after this event. During the observation, the spectrum developed a low-energy cutoff. NGC 1851 is the second globular cluster identified as a source of X-ray bursts, which suggests that all X-ray bursts may originate in globular clusters, some of which may be optically obscured.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1976
- DOI:
- 10.1086/182207
- Bibcode:
- 1976ApJ...207L.177F
- Keywords:
-
- Globular Clusters;
- Uhuru Satellite;
- X Ray Sources;
- Collimators;
- Energy Spectra;
- Spaceborne Astronomy;
- Astronomy