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

Journal Article · Sat May 01 04:00:00 EDT 1976 · Astrophys. J., Lett.; (United States)

DOI:https://doi.org/10.1086/182105· OSTI ID:7359983

Grindlay, J; Gursky, H; Schnopper, H; Parsignault, D R; Heise, J; Brinkman, A C; Schrijver, J

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 approx.1--30 keV X-ray intensity of this source are reported. Each displayed a rapid rise in flux (approximately-less-than1 s) by a factor of 20--30 followed by a approx.8 s exponential decay. These bursts appear to be qualitatively different from short time variations previously reported from 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. (AIP)

• Research Organization: Center for Astrophysics, Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, MA 02138
• OSTI ID: 7359983
• Journal Information: Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 205:3; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BLACK HOLES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
HARD X RADIATION
IONIZING RADIATIONS
RADIATION DETECTION
RADIATIONS
SOFT X RADIATION
SPECTRA
STAR CLUSTERS
X RADIATION
X-RAY DETECTION
X-RAY SPECTRA