Discovery of intense X-ray bursts from the globular cluster NGC 6624

Details Discovery of intense X-ray bursts from the globular cluster NGC 6624 Discovery of intense X-ray bursts from the globular cluster NGC 6624

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205l.127g&link_type=abstract

Astrophysical Journal, vol. 205, May 1, 1976, pt. 2, p. L127-L130.

Astronomy and Astrophysics

Astronomy

197

Black Holes (Astronomy), Globular Clusters, Satellite Observation, X Ray Sources, Astronomical Models, Astronomical Netherlands Satellite, Cosmic Rays, Energy Spectra, Radiant Flux Density, Spaceborne Astronomy

Scientific paper

A new type of time variation of cosmic X-ray sources has been found from the Astronomical Netherlands Satellite (ANS) observations of the source 3U 1820-30, associated with the globular cluster NGC 6624. Two bursts in the 1-30 keV X-ray intensity of this source are reported. Each displayed a rapid rise in flux (no more than 1 s) by a factor of 20-30 followed by an approximately 8-s exponential decay. These bursts appear to be qualitatively different from short time variations previously reported for X-ray sources. Analysis for further source variability, energy spectra, and position is presented. The characteristics of these events may imply the existence of a collapsed core in the globular cluster.

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