Analysis of RXTE-PCA Observations of SMC X-1

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2010-03-21

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İNAM, SITKI ÇAĞDAŞ
Baykal, Altan
Beklen, E.

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We present timing and spectral analysis of Rossi X-ray Timing Explorer-Proportional Counter Array observations of SMCX-1 between 1996 January and 2003 December. From observations around 1996 August 30 with a time-span of similar to 6 d, we obtain a precise timing solution for the source and resolve the eccentricity as 0.00089(6). We find an orbital decay rate of (P) over dot(orb)/P(orb) = -3.402(7) x 10(-6) yr(-1) which is close to the previous results. Using our timing analysis and the previous studies, we construct a similar to 30 yr long pulse period history of the source. We show that frequency derivative shows long- (i.e. more than a few years) and short-term (i.e. order of days) fluctuations. From the spectral analysis, we found that all spectral parameters except Hydrogen column density showed no significant variation with time and X-ray flux. Hydrogen column density is found to be higher as X-ray flux gets lower. This may be due to the increase in soft absorption when the pulsar is partially obscured as in Her X-1 or may just be an artefact of the tail of a soft excess in energy spectrum.

Subject Keywords

Space and Planetary Science, Astronomy and Astrophysics

URI

https://hdl.handle.net/11511/49121

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

DOI

https://doi.org/10.1111/j.1365-2966.2009.16121.x

Collections

Department of Physics, Article

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Citation Formats

S. Ç. İNAM, A. Baykal, and E. Beklen, “Analysis of RXTE-PCA Observations of SMC X-1,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, pp. 378–386, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49121.