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The 150d Modulation of the X-ray Emission of CYG X-1.
- Source :
- Astrophysics & Space Science; Nov2001, Vol. 278 Issue 3, p319-325, 7p
- Publication Year :
- 2001
-
Abstract
- The X-ray observations of Cyg X-1, covering a period of 3.8 years, by the All Sky Monitor (ASM) on board the Rossi X-ray Timing Explorer (RXTE) were analysed to search for long periodicities. The periodicities in the original data were seen to be distorted by the high/soft state and the failed state counts of the system, and thus the power spectra showed two unrealistic peaks at 1608and 406 days. The ∼ 300 day modulation reported previously(e.g. Priedhorsky et al. 1983) is not confirmed by the present ASM data. Truncation of the high counts above 30 cnts/s partly eliminates the distortion and reveals the true period of 150<superscript>d</superscript> in the power spectra. It is interesting that the high/soft state (HS) and the failed state transitions (FST) always occur on the maximum phase of the150<superscript>d</superscript> cycle. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0004640X
- Volume :
- 278
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Astrophysics & Space Science
- Publication Type :
- Academic Journal
- Accession number :
- 50013313
- Full Text :
- https://doi.org/10.1023/A:1013117601505