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arXiv 0704.0205astro-ph
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年轻射电脉冲星PSR J1357-6429 X射线辐射的发现

Discovery of X-ray emission from the young radio pulsar PSR J1357-6429

P. Esposito, A. Tiengo, A. De Luca, F. Mattana

摘要:

我们提出的第一个X射线检测非常年轻的脉冲星PSR J 1357 -6429(特征年龄为7.3 kyr)使用的数据从XMM-牛顿和钱德拉卫星。我们发现,光谱是很好地描述了幂律加黑体模型,光子指数γ =1.4和黑体温度kT=160 eV。对于2.5 kpc的估计距离,这对应于约1.2E+32 erg/s的2-10 keV光度,因此PSR J1357-6429引导的自旋下降能量进入X射线发射的部分是观测到的最低部分之一。钱德拉的数据证实了与射电脉冲星的位置重合,并允许在2-10 keV的紧凑脉冲星风星云的光度上设置3E+31 erg/s的上限。我们没有检测到任何脉冲发射源,并确定在脉冲星的射频的X射线发射的调制幅度的上限为30%。

英文摘要:

We present the first X-ray detection of the very young pulsar PSR J1357-6429 (characteristic age of 7.3 kyr) using data from the XMM-Newton and Chandra satellites. We find that the spectrum is well described by a power-law plus blackbody model, with photon index Gamma=1.4 and blackbody temperature kT=160 eV. For the estimated distance of 2.5 kpc, this corresponds to a 2-10 keV luminosity of about 1.2E+32 erg/s, thus the fraction of the spin-down energy channeled by PSR J1357-6429 into X-ray emission is one of the lowest observed. The Chandra data confirm the positional coincidence with the radio pulsar and allow to set an upper limit of 3E+31 erg/s on the 2-10 keV luminosity of a compact pulsar wind nebula. We do not detect any pulsed emission from the source and determine an upper limit of 30% for the modulation amplitude of the X-ray emission at the radio frequency of the pulsar.

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