Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates

作者：Nakagawa Yujin E^*; Yoshida Atsumasa; Yamaoka Kazutaka; Shibazaki Noriaki

来源：Publications of the Astronomical Society of Japan, 2009, 61(1): 109-122.

DOI：10.1093/pasj/61.1.109

• stars: neutron
• stars: pulsars: general
• X-rays: stars

Spectral studies of quiescent emission and bursts of magnetar candidates based on XMM-Newton, Chandra, and Swift data are presented. Spectra of both the quiescent emission and the burst for most magnetar candidates are reproduced by a photoelectrically absorbed two-blackbody 21313). There is a strong correlation between the lower and higher temperatures of 2BB (kT(LT) and kT(HT)) for the magnetar candidates of which the spectra are well reproduced by 2BB. In addition, a square of radius for kT(LT) (R(LT)(2)) is well correlated with a square of radius for kT(HT) (R(HT)(2)). The ratio kT(LT)/kT(HT) approximate to 0.4 is nearly constant irrespective of the objects and/or emission types (i.e., the quiescent emission and the burst). This would imply that an emission mechanism is common among the magnetar candidates. The relation between the quiescent emission and the burst might be analogous to a relation between the solar microflare and the solar flare. Three anomalous X-ray pulsars (AXPs) (4U 0142 614, IRXSJ170849.0-400910, and IE2259 586) seem to have an excess above similar to 7keV, which well agrees with a nonthermal hard component discovered by the International Gamma-Ray Astrophysics Laboratory (INTEGRAL).

• 出版日期2009