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arXiv 1302.6350astro-ph.HEastro-ph.GA
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Spitzer卫星在PSR J1549-4848附近偶然发现的红外弓形激波

Serendipitous Discovery of An Infrared Bow Shock Near PSR J1549-4848 with Spitzer

Zhongxiang Wang, David L. Kaplan, Patrick O. Slane, Nidia Morrell, Victoria M. Kaspi

摘要:

本文报道了在斯皮策巡天中发现的PSR J1549 $-$ 4848周围的红外彗星状星云。在发现之后,对星云进行了多波长成像和光谱观测。我们在Spitzer IRAC 8.0、MIPS 24和70 $μ$ m成像、Spitzer IRS 7.5 - 14.4 $μ$ m光谱观测以及WISE全天巡天12和22 $μ$ m观测中探测到了该星云。对这些数据进行了详细分析,我们发现该星云可以用标准的弓形激波形状来描述,其光谱中含有多环芳烃和H $_2$的发射特征。然而,目前还不确定是哪个天体驱动了星云。我们分析了场星,并得出结论,他们都不可能是相关的对象,因为恒星与强风或质量喷射,通常会产生弓形冲击比场星要亮得多。脉冲星距离相关天体预计所在的区域大约15 \arcsec\。为了解决这个矛盾,我们建议从脉冲星发射高度准直的风,并产生弓形激波。应进行X射线成像以探测风与周围介质的相互作用,并进行高空间分辨率无线电成像以确定脉冲星的自行,这将有助于核实脉冲星与弓形激波星云的关联。

英文摘要:

We report on the discovery of an infrared cometary nebula around PSR J1549$-$4848 in our Spitzer survey of a few middle-aged radio pulsars. Following the discovery, multi-wavelength imaging and spectroscopic observations of the nebula were carried out. We detected the nebula in Spitzer IRAC 8.0, MIPS 24 and 70 $μ$m imaging and in Spitzer IRS 7.5--14.4 $μ$m spectroscopic observations, and also in the WISE all-sky survey at 12 and 22 $μ$m.These data were analyzed in detail, and we find that the nebula can be described with a standard bow-shock shape, and that its spectrum contains polycyclic aromatic hydrocarbon and H$_2$ emission features. However, it is not certain which object drives the nebula. We analyze the field stars and conclude that none of them can be the associated object because stars with a strong wind or mass ejection that usually produce bow shocks are much brighter than the field stars. The pulsar is approximately 15\arcsec\ away from the region in which the associated object is expected to be located. In order to resolve the discrepancy, we suggest that a highly collimated wind could be emitted from the pulsar and produce the bow shock. X-ray imaging to detect the interaction of the wind with the ambient medium and high-spatial resolution radio imaging to determine the proper motion of the pulsar should be carried out, which will help verify the association of the pulsar with the bow shock nebula.

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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