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arXiv 0912.4229astro-ph.HE
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HESS J1507-622:银河平面外的一个独特的未识别源

HESS J1507-622: an unique unidentified source off the Galactic Plane

O. Tibolla, W. Domainko, W. Hofmann, O. de Jager, S. Kaufmann, N. Komin, K. Kosack

摘要:

银河系内部的甚高能(VHE,> 100 GeV)伽马射线源巡天观测趋向于聚集在银河平面周围1度的纬度范围内。HESS J1507-622是唯一的,因为它位于纬度约3.5度。HESS J1507-622在仪器的PSF上稍微延伸,因此它的银河起源是清楚的。在其他波长范围(无线电,红外线和X射线)中寻找对应物未能显示任何合理的对应物;考虑到它的位置离开银河平面,因此吸收几乎低一个数量级,非常令人惊讶的是没有看到任何对应物,特别是在X射线波长(ROSAT,XMM Newton和Chandra)。它的纬度意味着它要么相当接近,在1千秒差距之内,要么远离银河平面。模型也反映了这个物体的独特性:轻子PWN场景将这个源放置在距离多kpc的距离上,而强子场景将优先将这个物体定位在距离< 1 kpc的目标物质密度较高的地方。

英文摘要:

Galactic very high energy (VHE, > 100 GeV) gamma ray sources in the inner Galaxy H.E.S.S. survey tend to cluster within 1 degree in latitude around the Galactic plane. HESS J1507-622 instead is unique, since it is located at latitude of ~3.5 degrees. HESS J1507-622 is slightly extended over the PSF of the instrument and hence its Galactic origin is clear. The search for counterparts in other wavelength regimes (radio, infrared and X-rays) failed to show any plausible counterparts; and given its position off the Galactic plane and hence the absorption almost one order of magnitude lower, it is very surprising to not see any counterparts especially at X-rays wavelengths (by ROSAT, XMM Newton and Chandra). Its latitude implies that it is either rather close, within about 1 kpc, or is located well off the Galactic plane. And also the models reflect the uniqueness of this object: a leptonic PWN scenario would place this source due to its quite small extension to multi-kpc distance whereas a hadronic scenario would preferentially locate this object at distances of < 1 kpc where the density of target material is higher.

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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