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arXiv 1012.1164astro-ph.HE
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AX +0917和三个新发现的INTEGRAL源

AX J1910.7+0917 and three newly discovered INTEGRAL sources

L. Pavan, E. Bozzo, C. Ferrigno, C. Ricci, A. Manousakis, R. Walter, L. Stella

摘要:

我们利用IBIS/ISGRI望远镜的高灵敏度和数据分析软件的改进来研究仍然知之甚少的X射线源AX J1910.7+0917的性质,并搜索附近以前未被发现的物体。我们分析了AX J1910.7+0917的所有公开可用的INTEGRAL数据,以及在Chandra,XMM-Newton和ASCA的源方向上进行的一些档案观测。在AX J1910.7+0917周围的IBIS/ISGRI视场中,我们发现了三个新的源:IGR J19173+0747,IGR J19294+1327和IGR J19149+1036;后者与爱因斯坦源2 E 1912.5+1031位置重合。对于前两个来源,我们还报告了使用Swift/XRT进行的后续观察结果。AX J1910.7+0917在X射线中具有明显的可变性。它的光谱可用吸收(N_H~ 6 × 10 ^(22)cm^(-2))幂律(Γ~1.5)模型加上~6.4 keV的铁谱线来描述。我们还获得了一个精确的位置,并报告了可能的红外对应物。现有数据无法对源进行独特的分类。基于其X射线发射的性质和对可能的红外对应物的分析,我们研究了AX J1910.7+0917性质的不同可能性。

英文摘要:

We take advantage of the high sensitivity of the IBIS/ISGRI telescope and the improvements in the data analysis software to investigate the nature of the still poorly known X-ray source AX J1910.7+0917, and search for close-by previously undetected objects. We analyze all publicly available INTEGRAL data of AX J1910.7+0917, together with a number of archival observations that were carried out in the direction of the source with Chandra, XMM-Newton, and ASCA. In the IBIS/ISGRI field-of-view around AX J1910.7+0917, we discovered three new sources: IGR J19173+0747, IGR J19294+1327 and IGR J19149+1036; the latter is positionally coincident with the Einstein source 2E 1912.5+1031. For the first two sources, we also report the results of follow-up observations carried out with Swift/XRT. AX J1910.7+0917 features a clear variability in the X-rays. Its spectrum can be well described with an absorbed (N_H~6x10^(22) cm^(-2)) power-law (Γ~1.5) model plus an iron line at ~6.4 keV. We also obtained a refined position and report on possible infrared counterparts. The present data do not allow for a unique classification of the sources. Based on the property of its X-ray emission and the analysis of a likely infrared counterpart, we investigate different possibilities for the nature of AX J1910.7+0917.

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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