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arXiv 0909.2520astro-ph.HE
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未确认费米源0 FGL J1848的对应候选者。6 -0138

Counterpart candidates to the unidentified Fermi source 0FGL J1848.6-0138

P. L. Luque-Escamilla, J. Marti, A. J. Munoz-Arjonilla J. R. Sanchez-Sutil, J. A. Combi, E. Sanchez-Ayaso

摘要:

目标。我们的目标是在这里作出贡献,在最近发布的目录费米合作获得的非关联明亮的伽马射线源的识别。方法.我们的工作是基于广泛的交叉识别的来源,从不同的波长目录和数据库。结果作为第一个结果,我们报告的费米LAT不明伽马射线源0 FGL J1848.6 $-$ 0138的95%置信误差框内的几个对应的候选人的发现。球状星团GLIMPSE-C 01在最奇特的天体中非常突出,这与伽马射线源的位置不确定性以及伽马射线产生的可能物理情景相一致。费米观测到的光谱与文献中的理论预测进行了比较,使得这种关联似乎是合理的,但由于其X射线与伽马射线的光度比较低,因此还不确定。其他竞争对手也进行了讨论。特别是,我们要特别注意一个可能的脉冲星风星云内的费米误差箱的性质尚未得到证实。结论:一个球状星团和一个类似脉冲星风星云的红外源都被发现与0 FGL J1848.6 $-$ 0138的位置一致。此外,还报告了该领域的其他有趣物体。未来的伽马射线观测将缩小位置的不确定性,我们希望最终确认这里报道的对应候选者之一。如果GLIMPSE-C 01得到证实,再加上费米可能探测到著名的球状星团47 Tuc,那么它将为球状星团作为γ射线源的理论预言提供强有力的支持。

英文摘要:

Aims. We aim here to contribute to the identification of unassociated bright sources of gamma-rays in the recently released catalogue obtained by the Fermi collaboration. Methods. Our work is based on a extensive cross-identification of sources from different wavelength catalogues and databases. Results. As a first result, we report the finding of a few counterpart candidates inside the 95% confidence error box of the Fermi LAT unidentified gamma-ray source 0FGL J1848.6$-$0138. The globular cluster GLIMPSE-C01 remarkably stands out among the most peculiar objects consistent with the position uncertainty of the gamma-ray source and with a conceivable physical scenario for gamma-ray production. The Fermi observed spectrum is compared against theoretical predictions in the literature making the association plausible but not yet certain due to its low X-ray to gamma-ray luminosity ratio. Other competing counterparts are also discussed. In particular, we pay a special attention to a possible Pulsar Wind Nebula inside the Fermi error box whose nature is yet to be confirmed. Conclusions.Both a globular cluster and an infrared source resembling a Pulsar Wind Nebula have been found in positional agreement with 0FGL J1848.6$-$0138. In addition, other interesting objects in the field are also reported. Future gamma-ray observations will narrow the position uncertainty and we hope to eventually confirm one of the counterpart candidates reported here. If GLIMPSE-C01 is confirmed, together with the Fermi possible detection of the well known globular cluster 47 Tuc, then it would provide strong support to theoretical predictions of globular clusters as gamma-ray sources.

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