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arXiv 0712.0826astro-ph
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快速射电脉冲星PSR B1133 +16的可能光学探测

Possible optical detection of a fast, nearby radio pulsar PSR B1133+16

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

摘要:

目的:我们对一颗老的、快速移动的射电脉冲星PSR B1133+16的视场进行了深度光学观测,试图探测它的光学对应物和弓形激波星云。方法:在欧洲南方天文台VLT/UT 1望远镜上,利用FORS 1的直接成像模式,在B、R和H α波段进行观测。我们还使用了VLT在B波段和Chandra/ACIS在X射线中获得的同一领域的档案图像。结果如下:在B波段,我们探测到一个微弱的(B=28.1+/-0.3)源,它可能是PSR B1133+16的光学对应物,因为它与射电脉冲星和先前发表的X射线对应物候选者的位置一致。它在R波段的上限意味着颜色指数B-R <0.5,这与光学范围内识别的大多数光谱的指数值一致。推导出的光学光度和它的比例的X射线光度的候选人是一致的预期值来自一个样本中的光谱域中检测到的恒星。没有检测到巴尔末弓形激波,这意味着脉冲星周围的环境物质密度很低。然而,在X射线和H_alpha图像中,我们发现了脉冲星后方约4”-5”延伸的痕迹,并且与其自行方向一致。如果通过更深入的研究得到证实,这是第一次在光学和X射线波长中看到这样的踪迹。结论:在以后的时期进一步的观测是必要的,以确认识别脉冲星的候选人的自行测量。

英文摘要:

Aims: We performed deep optical observations of the field of an old, fast-moving radio pulsar PSR B1133+16 in an attempt to detect its optical counterpart and a bow shock nebula. Methods: The observations were carried out using the direct imaging mode of FORS1 at the ESO VLT/UT1 telescope in the B, R, and H_alpha bands. We also used archival images of the same field obtained with the VLT in the B band and with the Chandra/ACIS in X-rays. Results: In the B band we detected a faint (B=28.1+/-0.3) source that may be the optical counterpart of PSR B1133+16, as it is positionally consistent with the radio pulsar and with the X-ray counterpart candidate published earlier. Its upper limit in the R band implies a color index B-R <0.5, which is compatible with the index values for most pulsars identified in the optical range. The derived optical luminosity and its ratio to the X-ray luminosity of the candidate are consistent with expected values derived from a sample of pulsars detected in both spectral domains. No Balmer bow shock was detected, implying a low density of ambient matter around the pulsar. However, in the X-ray and H_alpha images we found the signature of a trail extending ~4"-5" behind the pulsar and coinciding with the direction of its proper motion. If confirmed by deeper studies, this is the first time such a trail has been seen in the optical and X-ray wavelengths. Conclusions: Further observations at later epochs are necessary to confirm the identification of the pulsar by the candidate's proper motion measurements.

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