Short-term X-ray variability of the globular cluster source 4U 1820 - 30 (NGC 6624)

Details Short-term X-ray variability of the globular cluster source 4U 1820 - 30 (NGC 6624) Short-term X-ray variability of the globular cluster source 4U 1820 - 30 (NGC 6624)

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..713s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 713-718.

Astronomy and Astrophysics

Astrophysics

33

Bursts, Globular Clusters, X Ray Sources, X Ray Spectra, Accretion Disks, Correlation, Galactic Bulge, Radiant Flux Density, Shot Noise, Time Series Analysis

Scientific paper

Analytical techniques for improved identification of the temporal and spectral variability properties of globular cluster and galactic bulge X-ray sources are described in terms of their application to a large set of observations of the source 4U 1820 - 30 in the globular cluster NGC 6624. The autocorrelation function, cross-correlations, time skewness function, erratic periodicities, and pulse trains are examined. The results are discussed in terms of current models with particular emphasis on recent accretion disk models. It is concluded that the analyzed observations provide the first evidence for shot-noise variability in a globular cluster X-ray source.

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