X-ray periodicities in sources observed by the RXTE ASM
Name
62627769-MIT.pdf
Description
Full printable version
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1.88 MB
Format
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Checksum (MD5)
0d2cd27bdf09b0693633dbcfb8fa901c
Author(s)
Shivamoggi, Vasudha B
Advisor(s)
Alan M. Levine.
Date Issued
2005
Publisher
Massachusetts Institute of Technology
Abstract
The X-ray intensities measured from 230 X-ray sources observed by the RXTE All-Sky Monitor (ASM) were analyzed for periodic behavior. The ASM has been observing sources for nine years in the 1.5-12 keV energy range. In this search, we investigated a frequency range of 5 d⁻¹ to 144 d⁻¹ for periodic modulation. The search was carried out by applying the Fast Fourier Transform on the ASM data and whitening the resulting power density spectrum using a local averaging technique. A power threshold was set to determine the statistical significance of a peak in the power density spectrum. The search verified the orbital frequencies of four known X-ray binaries and also identified four previously unreported periodicities. The 5.7232 d⁻¹ orbital frequency of GX 9+9 was observed for the first time in ASM data, although this modulation had been observed before. The 6.0999 d⁻¹ peak found for XTE J1723-376 has not been reported before and may be an orbital frequency.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.
Includes bibliographical references (p. 49-50).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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