Detection of a 522s Pulsation from the Transient X-Ray Source Suzaku J0102.8-7204 (SXP 523) in the Small Magellanic Cloud

作者：Wada Qazuya^*; Tsujimoto Masahiro; Ebisawa Ken; Miller Eric D

来源：Publications of the Astronomical Society of Japan, 2013, 65(2).

• galaxies: Magellanic Clouds
• stars: emission-line, Be
• stars: pulsars: individual (Suzaku J0102.8-7204, SXP 523)
• X-rays: bursts

During a routine calibration observation of 1E 0102.2-7219 in the Small Magellanic Cloud (SMC), carried out in 2012 October for the Suzaku satellite, we detected a transient X-ray source at (RA, Dec) = (01(h)02(m)47(s), -72 degrees 04(m)54(s)) in the equinox J2000.0 with a positional uncertainty of similar to 1.'' 4. We conducted a temporal and spectral analysis of the source and found a coherent pulse signal with a period of 522.3 +/- 0.1 s. We also found a featureless spectrum described by a single power-law model with a photon index of 1.0(-0.1)(+0.1) and a 0.5-10 keV luminosity of similar to 8.8 x 10(35) ergs s(-1) at an assumed distance of 60 kpc. The Suzaku source is likely to be the counterpart of 2XMM J010247.4-720449, which has been observed several times, including outburst detected by Swift. Based on the X-ray characteristics from our data, as well as the transient record and optical and near-infrared features described in the literature, we conclude that this source is a high-mass X-ray binary pulsar with a Be star companion in the SMC, which is known to harbor an exceptionally large (80) number of such sources compared to that in our Galaxy.

• 出版日期2013-4-25