Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-12-02
MNRAS 413 (2011) 241-248
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
9 pages, 7 figures, Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2010.18128.x
We report the timing and broad-band spectral properties of the Be transient high mass X-ray binary pulsar GRO J1008-57 using a Suzaku observation in the declining phase of its 2007 November-December outburst. Pulsations with a period of 93.737 s were clearly detected in the light curves of the pulsar up to the 80-100 keV energy band. The pulse profile was found to be strongly energy dependent, a double peaked profile at soft X-ray energy bands (< 8 keV) and a single peaked smooth profile at hard X-rays. The broad-band energy spectrum of the pulsar, reported for the first instance in this paper, is well described with three different continuum models viz. (i) a high energy cut-off power-law, (ii) a Negative and Positive power-law with EXponential cut-off (NPEX), and (iii) a partial covering power-law with high energy cut-off. Inspite of large value of absorption column density in the direction of the pulsar, a blackbody component of temperature ~0.17 keV for the soft excess was required for the first two continuum models. A narrow iron K_\alpha emission line was detected in the pulsar spectrum. The partial covering model, however, is found to explain the phase averaged and phase resolved spectra well. The dip like feature in the pulse profile can be explained by the presence of an additional absorption component with high column density and covering fraction at the same pulse phase. The details of the results are described in the paper.
Kachhara Chetan
Naik Sachindra
Paul Biswajit
Vadawale Santosh V.
No associations
LandOfFree
Suzaku observation of the transient X-ray pulsar GRO J1008-57 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Suzaku observation of the transient X-ray pulsar GRO J1008-57, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suzaku observation of the transient X-ray pulsar GRO J1008-57 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-603499