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Recent Torque Reversal of 4U 1907+09
S. C. Inam, S. Sahiner, A. Baykal
We present timing and spectral analysis of RXTE-PCA observations of the accretion powered pulsar 4U 1907+09 between June 2007 and August 2008. 4U 1907+09 had been in a spin-down ep…
Evidence of a Change in the Long Term Spin-down Rate of the X-ray Pulsar 4U 1907+09
A. Baykal, S. C. Inam, E. Beklen
We analyzed RXTE archival observations of 4U 1907+09 between 17 February 1996 and 6 March 2002. The pulse timing analysis showed that the source stayed at almost {\bf{constant}} pe…
Recent Timing Studies on RXTE Observations of 4U 1538-52
A. Baykal, S. C. Inam, E. Beklen
The high mass X-ray binary pulsar 4U 1538-52 was observed between July 31 and August 7, 2003. Using these observations, we determined new orbital epochs for both circular and ellip…
Discovery of Soft Spectral Component and Transient 22.7s Quasi Periodic Oscillations of SAX J2103.5+4545
S. C. Inam, A. Baykal, J. Swank +1
XMM-Newton observed SAX J2103.5+4545 on January 6, 2003, while RXTE was monitoring the source. Using RXTE-PCA dataset between December 3, 2002 and January 29, 2003, the spin period…
X-ray Flux Related Timing and Spectral Features of 2S 1417-62
S. C. Inam, A. Baykal, D. M. Scott +2
RXTE observations of the X-ray transient pulsar 2S 1417-62 between 1999 November and 2000 August with a total exposure of ksec were analyzed. Observations include a main…
X-ray Flux and Pulse Frequency Changes of Three High Mass X-ray Binary Pulsars: Vela X-1, GX 301-2 and OAO 1657-415
Sitki Cagdas Inam, Altan Baykal
Using archival BATSE (Burst and Transient Source Experiment) 20-60 keV band X-ray flux and pulse frequency time series, we look for correlations between torque, luminosity and spec…