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arXiv 0802.3707astro-ph
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PSR J2021 +3651周围的环和喷流:"蜻蜓星云"

Rings and Jets around PSR J2021+3651: the `Dragonfly Nebula'

Adam Van Etten, Roger W. Romani, C. -Y. Ng

摘要:

我们描述了最近钱德拉ACIS观测船帆座脉冲星PSR J2021 + 3651和它的脉冲星风星云(PWN)。这个"蜻蜓星云"显示出轴对称的形态,有明亮的内部喷流,一个双脊状内部星云和一个~30 "的极地喷流。PWN嵌入在微弱的弥散辐射中:一个类似弓形激波的结构,距离约1 ',将脉冲星包围在东方,辐射向西拖尾3 - 4'。热(kT = 0.16 +/-0.02 keV)和幂律发射检测到脉冲星。星云的X射线显示光谱变陡,从赤道环面的伽马= 1.5到外层星云的伽马= 1.9,表明同步加速器烧毁。与"Dragonfly"结构的拟合表明具有双赤道环面的大倾角(86 +/-1度)。Vela是目前唯一显示这种双重结构的PWN。脉冲星色散测量所暗示的大于12千秒差距的距离并没有得到X射线数据的支持;光谱、尺度和效率参数表明,这个距离是3 - 4千秒差距。

英文摘要:

We describe recent Chandra ACIS observations of the Vela-like pulsar PSR J2021+3651 and its pulsar wind nebula (PWN). This `Dragonfly Nebula' displays an axisymmetric morphology, with bright inner jets, a double-ridged inner nebula, and a ~30" polar jet. The PWN is embedded in faint diffuse emission: a bow shock-like structure with standoff ~1' brackets the pulsar to the east and emission trails off westward for 3-4'. Thermal (kT=0.16 +/-0.02 keV) and power law emission are detected from the pulsar. The nebular X-rays show spectral steepening from Gamma=1.5 in the equatorial torus to Gamma=1.9 in the outer nebula, suggesting synchrotron burn-off. A fit to the `Dragonfly' structure suggests a large (86 +/-1 degree) inclination with a double equatorial torus. Vela is currently the only other PWN showing such double structure. The >12 kpc distance implied by the pulsar dispersion measure is not supported by the X-ray data; spectral, scale and efficiency arguments suggest a more modest 3-4 kpc.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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