1997/01/13 by C. R. Robinson, Robinson, C. R., B. A. Harmon +17
Decision Sciences · Engineering · Physics and Astronomy · #Advanced X-ray and CT Imaging #Astrophysics (astro-ph) #FOS: Physical sciences #Particle Detector Development and Performance #Scientific Computing and Data Management #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9701067
4 pages (LaTeX) including 3 PostScript figures; to appear in Proceedings of the 2nd INTEGRAL Workshop "The Transparent Universe" (St. Malo, France), eds. C. Winkler et al., ESA SP-382, in press
arxiv created 1997/01/13 · openalex publication_date 1997/01/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The operation of CGRO/BATSE continues to produce, after more than 5 years, a valuable database for the study of long-term variability in bright hard X-ray sources. The all-sky capability of BATSE provides, using the Earth occultation technique, up to approximately 30 flux measurements per day for each source. The long BATSE baseline and the numerous rising and setting occultation flux measurements allow searches for periodic and quasi-periodic signals from hours to hundreds of days. We present initial results from our study of the hard X-ray variability in 24 of the brightest BATSE sources. Power density spectra are computed for each source. In addition, we present profiles of the hard X-ray orbital modulations in 8 X-ray binaries (Cen X-3, Cyg X-1, Cyg X-3, GX 301-2, Her X-1, OAO1657-415, Vela X-1 and 4U1700-37), several-hundred-day modulations in the amplitude and width of the main high state in the 35-day cycle in Her X-1, and variations in outburst durations and intensities in the recurrent X-ray transients.