ANS observations on the X-ray burster MXB1730-335
Abstract
An improved position and energy spectrum are reported for the X-ray 'burster' MXB1730-335, which was observed for three days in March 1976 by the Astronomical Netherlands Satellite (ANS). It is noted that the X-ray bursts are characterized by a rapid rise in flux (about 0.5 sec) to a relative intensity comparable to that of the Crab Nebula, followed by an exponential decay on a time scale of about 10 sec. An upper limit is obtained for the steady source level between bursts, the improved positional error box is found to contain a globular cluster, and data on 10 bursting X-ray sources are compared. It is concluded that certain characteristic features of the bursts from MXB1730-335 are consistent with a model in which the X-ray emitting region is situated in a cloud of hot gas near a massive black hole at the center of a globular cluster.
- Publication:
-
Nature
- Pub Date:
- June 1976
- DOI:
- 10.1038/261562a0
- Bibcode:
- 1976Natur.261..562H
- Keywords:
-
- Astronomical Netherlands Satellite;
- Cosmic Rays;
- Energy Spectra;
- Radiant Flux Density;
- X Ray Sources;
- Astronomical Models;
- Black Holes (Astronomy);
- Compton Effect;
- Crab Nebula;
- Galactic Structure;
- Globular Clusters;
- Luminous Intensity;
- Astrophysics;
- ASTRONOMICAL NETHERLANDS SATELLITE;
- COSMIC RAYS;
- ENERGY SPECTRA;
- RADIANT FLUX DENSITY;
- X RAY SOURCES;
- ASTRONOMICAL MODELS;
- BLACK HOLES (ASTRONOMY);
- COMPTON EFFECT;
- CRAB NEBULA;
- GALACTIC STRUCTURE;
- GLOBULAR CLUSTERS;
- LUMINOUS INTENSITY