Suzaku Observation of the Anomalous X-Ray Pulsar CXOU J164710.2—455216

• Published in: Publications of the Astronomical Society of Japan Vol. 60; no. 2; pp. 237 - 244
• Main Authors: Naik, Sachindra, Dotani, Tadayasu, Kawai, Nobuyuki, Kokubun, Motohide, Anada, Takayasu, Morii, Mikio, Mihara, Tatehiro, Enoto, Teruaki, Kawaharada, Madoka, Murakami, Toshio, Nakagawa, Yujin E., Takahashi, Hiromitsu, Terada, Yukikatsu, Yoshida, Atsumasa
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford University Press 25.04.2008
• Subjects: X-rays: individual (CXOU J164710.2–455216); X-rays: general; pulsars: individual (CXOU J164710.2–455216); stars: neutron
• ISSN: 0004-6264; 2053-051X
• DOI: 10.1093/pasj/60.2.237

A Suzaku TOO observation of CXOU J164710.2 $-$ 455216 was performed on 2006 September 23–24 for a net exposure of 38.8 ks. Pulsations were clearly detected in the XIS light curves with a pulse period of 10.61063(2) s. The XIS pulse profile is found to be highly non-sinusoidal. It shows 3 peaks of different amplitudes with an RMS fractional amplitude of $\sim$ 11% in the 0.2–6.0 keV energy band. The 1–10 keV XIS spectra were well fitted by two different models consisting of a power-law and a blackbody component and two blackbody components, respectively. Although both the models are statistically acceptable, a difference in the pulse profiles at soft (0.2–6.0 keV) and hard (6–12 keV) X-rays favors the model consisting of two blackbody components. The temperatures of two blackbody components are found to be 0.61 $\pm$ 0.01 keV and 1.22 $\pm$ 0.06 keV, and the value of the absorption column density is 1.73 $\pm$ 0.03 $\times$ 10 $^{22}$ atoms cm $^{-2}$ . Pulse phase resolved spectroscopy shows that the flux of the soft blackbody component consists of three narrow peaks, whereas the flux of the other component shows a single peak over the pulse period of the AXP. The blackbody radii change between 2.2–2.7 km and 0.28–0.38 km (assuming the source distance to be 5 kpc) over the pulse phases for the soft and hard components, respectively. The details of the results obtained from the timing and spectral analyses are presented.