Analysis of RXTE-PCA Observations of SMC X-1

Download

index.pdf

Date

2010-03-21

Author

İNAM, SITKI ÇAĞDAŞ
Baykal, Altan
Beklen, E.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

203
views

0
downloads

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

Suggestions

OpenMETU
Core

RXTE and Swift Observations of SWIFT J0513.4-6547 Sahiner, S.; Serim, Muhammed Miraç; Baykal, Altan; İNAM, SITKI ÇAĞDAŞ (Oxford University Press (OUP), 2016-02-11) We present timing and spectral analysis of Swift-XRT (X-ray Telescope) and RXTE-PCA (Rossi X-ray Timing Explorer-proportional Counter Array) observations of the transient Be/X-ray pulsar SWIFT J0513.4-6547 during its outburst in 2009 and its rebrightening in 2014. From 2009 observations, short-term spin-up rate of the source after the peak of the outburst is found to have about half of the value measured at the peak of the outburst by Coe et al. When the source is quiescent between 2009 and 2014, average sp...
Comprehensive analysis of the transient X-ray pulsar MAXI J1409 619 Donmez, C. K.; Serim, Muhammed Miraç; Inam, S. C.; Sahiner, S.; Serim, D.; Baykal, Altan (Oxford University Press (OUP), 2020-08-01) We probe the properties of the transient X-ray pulsar MAXI J1409-619 through RXTE and Swift follow-up observations of the outburst in 2010. We are able to phase-connect the pulse arrival times for the 25 d episode during the outburst. We suggest that either an orbital model (with P-orb similar or equal to 14.7(4) d) or a noise process due to random torque fluctuations (with S-r approximate to 1.3 x 10(-18) Hz(2) S-2 Hz(-1)) is plausible to describe the residuals of the timing solution. The frequency derivat...
X-ray spectral evolution of Her X-1 in a low state and the following short high state Inam, SC; Baykal, Altan (Oxford University Press (OUP), 2005-08-21) We analysed spectral variations of similar to 8.5-d long Rossi X-ray Timing Explorer (RXTE) monitoring observations of Her X-1 in 2001 December. This set of observations enables, for the first time, frequent continuous monitoring (111 pointings in similar to 8.5 d) of the source with RXTE including a similar to 1.7-d-long low state part and the following similar to 6.8-d-long short high state part. We used an absorbed power-law model with an iron line energy complex modelled as a Gaussian to fit both the 3-...
RXTE-PCA observations of XMMU J054134.7-682550 İNAM, SITKI ÇAĞDAŞ; Townsend, L. J.; McBride, V. A.; Baykal, Altan; Coe, M. J.; Corbet, R. H. D. (Oxford University Press (OUP), 2009-05-21) We analysed Rossi X-ray Timing Explorer Proportional Counter Array observations of a recent outburst of the X-ray pulsar XMMU J054134.7-682550. We calculated the pulse frequency history of the source. We found no sign of a binary companion. The source spins up when the X-ray flux is higher, with a correlation between the spin-up rate and X-ray flux, which may be interpreted as a sign of an accretion disc. On the other hand, the source was found to have an almost constant spin frequency when the X-ray flux i...
Discovery of a soft spectral component and transient 22.7 second quasi-periodic oscillations of SAX J2103.5+4545 Inam, SC; Baykal, Altan; Swank, J; Stark, MJ (IOP Publishing, 2004-11-20) XMM-Newton observed SAX J2103.5+4545 on 2003 January 6, while the Rossi X-Ray Timing Explorer (RXTE) was also monitoring the source. Using the RXTE Proportional Counter Array data set between 2002 December 3 and 2003 January 29, the spin period and average spin-up rate during the XMM-Newton observations were found to be 354.7940+/-0.0008 s and (7.4+/-0.9)x10(-13) Hz s(-1), respectively. In the power spectrum of the 0.9-11 keV EPIC PN light curve, we found quasi-periodic oscillations (QPOs) around 0.044 Hz (...

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.