Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..562h&link_type=abstract
Nature, vol. 261, June 17, 1976, p. 562-564.
Astronomy and Astrophysics
Astronomy
12
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
Scientific paper
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.
Brinkman Albert C.
den Boggende Antonius J. F.
Grindlay Jonathan
Gursky Herbert
Heise Jaret
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