论文标题
Chandra对新发现的Magnetar Swift J1818.0-1607的观察结果
Chandra observations of the newly discovered magnetar Swift J1818.0-1607
论文作者
论文摘要
Swift J1818.0-1607是3月2020年Swift Burst Alert Telescope发现的新型无线电大通磁铁。它具有磁场B〜2.5E14 g，旋转的光度为7.2e35 ergs/s，并且特征年龄〜470岁。在这里，我们报告了Swift J1818.0-1607的Chandra观察结果，该观察允许对磁铁及其环境进行高分辨率成像和光谱研究。单个黑体模型的温度为1.2 \ pm0.1 keV，未吸收的通量为1.9e-11e-11 Ergs/cm^2/s，最好通过单个黑体模型来描述磁力的1-10 keV光谱。这意味着X射线光度为〜9.6E34 ERGS/s，效率约为0.13，距离为6.5 kpc。钱德拉图像还显示了远离磁场> 10英寸的微弱弥漫发射，其频谱由powerlaw进行了对光子指数为2.0 \ pm0.5的powerlaw及其光度〜8.1e33 ergs/s的光度。延长的发射可能由尘埃散射的halo和未来的频率弥补。 J1818.0-1607是一种瞬态来源，显示了高B脉冲星和磁铁之间的性质，并且至少可以部分通过其高旋转式向下驱动，类似于旋转驱动的脉冲星。
Swift J1818.0-1607 is a new radio-loud magnetar discovered by the Swift Burst Alert Telescope on 2020 March 12. It has a magnetic field B~2.5e14 G, spin-down luminosity of 7.2e35 ergs/s, and characteristic age of ~470yr. Here we report on the Chandra observations of Swift J1818.0-1607, which allowed for a high-resolution imaging and spectroscopic study of the magnetar and its environment. The 1-10 keV spectrum of the magnetar is best described by a single blackbody model with a temperature of 1.2\pm0.1 keV and an unabsorbed flux of 1.9e-11 ergs/cm^2/s. This implies an X-ray luminosity of ~9.6e34 ergs/s and an efficiency of ~0.13 at a distance of 6.5 kpc. The Chandra image also shows faint diffuse emission out to >10" from the magnetar, with its spectrum adequately described by a powerlaw with a photon index of 2.0\pm0.5 and a luminosity of ~8.1e33 ergs/s. The extended emission is likely dominated by a dust scattering halo and future observations of the source in quiescence will reveal any underlying compact wind nebula. We conclude that Swift J1818.0-1607 is a transient source showing properties between high-B pulsars and magnetars, and could be powered at least partly by its high spin-down similar to the rotation-powered pulsars.
