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arXiv 0810.1930astro-ph
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可能是G292 .0+1.8脉冲星风星云的光学对应物

A likely optical counterpart of the G292.0+1.8 pulsar wind nebula

S. V. Zharikov, Yu. A. Shibanov, D. A. Zyuzin, R. E. Mennickent, V. N. Komarova

备注：
10 pages, 6 figures, A&A, accepted
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摘要：

G292.0+1.8是一颗类似Cas A的超新星遗迹，包含年轻的脉冲星PSR J1124-5916，它为一个紧凑的环形脉冲星风星云提供动力，并在X射线中可见喷流。我们对脉冲星场进行了深度光学观测，以探测脉冲星及其星云的光学对应物。观测是在ESO VLT/UT 1望远镜上使用FORS 2的直接成像模式在V，R和I波段进行的。我们还分析了Chandra/ACIS-I，ACIS-S和HRC-S在X射线中获得的存档图像。在所有三个光学波段，我们检测到一个微弱的椭圆状星云，其亮度峰值和中心位置是一致的，在亚弧秒的水平与X射线的脉冲星的位置。该区域密集地挤满了背景恒星，但在减去这些恒星后，该物体的形态及其主轴的方向似乎与脉冲星星云环面区域最明亮的内部部分非常一致，几乎在X射线中看到边缘。在星云内，我们没有分辨出任何可以用脉冲星识别的点状光学物体，估计它对观测到的星云通量的贡献<~ 20%。从与光源位置和范围相当的物理区域提取X射线谱，并与测量的光通量相结合，编制了星云内部的多波长光谱。在G292.0+1.8的星际消光的不确定性中，它让人想起蟹状星云或PSR B540-69和J 0205 +6449脉冲星风星云光谱。探测到的星云的位置、形态和光谱特性表明，它很可能是G292.0+1.8中脉冲星及其风星云系统的光学对应物。

英文摘要：

G292.0+1.8 is the Cas A-like supernova remnant containing the young pulsar PSR J1124-5916, which powers a compact torus-like pulsar wind nebula with a jet visible in X-rays. We have performed deep optical observations of the pulsar field to detect the optical counterpart of the pulsar and its nebula. The observations were carried out using the direct imaging mode of FORS2 at the ESO VLT/UT1 telescope in the V, R, and I bands. We also analyzed archival images obtained with the Chandra/ACIS-I, ACIS-S, and HRC-S in X-rays. In all three optical bands we detect a faint elliptical nebulosity, whose brightness peak and center position are consistent at a sub-arcsecond level with the X-ray position of the pulsar. The field is densely packed with background stars, but after subtraction of these stars the morphology of the object and the orientation of its major axis appear to be in a good agreement with the brightest inner part of the pulsar nebula torus region seen almost edge on in X-rays. Within the nebulosity we do not resolve any point-like optical object that could be identified with the pulsar and estimate its contribution to the observed nebulosity flux as <~20%. Extracting the X-ray spectrum from the physical region equivalent to the optical source position and extent and combining that with the measured optical fluxes, we compile a tentative multi-wavelength spectrum of the inner part of the nebula. Within uncertainties of the interstellar extinction towards G292.0+1.8 it is reminiscent of either the Crab or PSR B540-69 and J0205+6449 pulsar wind nebula spectra. The position, morphology, and spectral properties of the detected nebulosity suggest that it is the likely optical counterpart of the pulsar plus its wind nebula system in G292.0+1.8.

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