A Re-examination of the
A Re-examination of the
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发表时间：
2001-12
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通讯作者：
K. Sahu;Jay Anderson;I. King
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作者：
K. Sahu;Jay Anderson;I. King
我们对Sahu等人（2001）报告的暂时的短期增亮现象进行了进一步的分析，这些增亮现象被认为是球状星团M22中自由漂浮的行星对银河系核球恒星的透镜效应。更仔细的检查表明--尽管看起来不太可能--在两张宇宙射线分裂图像中，小的点状宇宙射线非常接近同一颗星星，这导致了在报告的时间和位置的恒星明显变亮。我们发现，观察到的双重命中的数量与WFPC 2图像中宇宙射线的频率是一致的，给出了观察到的恒星和时代的数量。最后，我们指出可以更直接地区分宇宙射线的方法。
We have carried out further analysis of the tentative, short-term brightenings reported by Sahu et al. (2001), which were suggested to be possible lensings of Galactic-bulge stars by free-floating planets in the globular cluster M22. Closer examination shows that--unlikely as it may seem--small, point-like cosmic rays had hit very close to the same star in both of a pair of cosmic-ray-split images, which cause the apparent brightenings of stars at the times and locations reported. We show that the observed number of double hits is consistent with the frequency of cosmic rays in WFPC2 images, given the number of stars and epochs observed. Finally, we point to ways in which cosmic rays can be more directly distinguished.