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Title: RXTE-PCA observations of 1A 1118--61: timing and spectral studies during an outburst
Authors: Devasia, Jincy
James, Marykutty
Paul, Biswajit
Indulekha, Kavila
Keywords: Binaries
X-ray binaries
Issue Date: Jun-2011
Publisher: Wiley Interscience for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2011, Vol.414, p1023
Abstract: We report detailed timing and spectral analysis of RXTE-PCA data obtained from observations during the outburst of a transient X-ray pulsar 1A 1118–61 in January 2009. The pulse profile showed significant evolution during the outburst and also significant energy dependence − a double peaked profile upto 10 keV and a single peak at higher energy. We have also detected quasi-periodic oscillations (QPO) at 0.07–0.09 Hz. The rms value of the QPO is 5.2 % and it shows a significant energy dependence with highest rms of 7% at 9 keV. The QPO frequency changed from 0.09 Hz to 0.07 Hz within 10 days. The magnetic field strength calculated using the QPO frequency and the X-ray luminosity is in agreement with the magnetic field strength measured from the energy of the cyclotron absorption feature detected in this source. The 3-30 keV energy spectrum over the 2009 outburst of 1A 1118–61 can be well fitted with a partial covering power-law model with a high energy cutoff and an iron fluorescence line emission. The pulse phase resolved spectral analysis shows that the partial covering and high energy cutoff model parameters have significant changes with the pulse phase.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0035-8711
1365-2966 (online)
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Copyright: 2011 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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