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长期AGILE监测令人费解的gamma-ray源3EG J1835 +5918

Long-term AGILE monitoring of the puzzling gamma-ray source 3EG J1835+5918

A. Bulgarelli, M. Tavani, P. Caraveo, A. W. Chen, F. Gianotti, M. Trifoglio, M. Marelli, A. Argan, G. Barbiellini, F. Boffelli, P. W. Cattaneo, V. Cocco, E. Cos… 展开作者

A. Bulgarelli, M. Tavani, P. Caraveo, A. W. Chen, F. Gianotti, M. Trifoglio, M. Marelli, A. Argan, G. Barbiellini, F. Boffelli, P. W. Cattaneo, V. Cocco, E. Costa, F. D'Ammando, E. Del Monte, G. De Paris, G. Di Cocco, I. Donnarumma, Y. Evangelista, M. Feroci, M. Fiorini, T. Froysland, F. Fuschino, M. Galli, A. Giuliani, C. Labanti, I. Lapshov, F. Lazzarotto, P. Lipari, F. Longo, M. Marisaldi, S. Mereghetti, A. Morselli, L. Pacciani, A. Pellizzoni, F. Perotti, G. Piano, P. Picozza, M. Prest, G. Pucella, M. Rapisarda, A. Rappoldi, P. Soffitta, A. Trois, E. Vallazza, S. Vercellone, V. Vittorini, A. Zambra, D. Zanello, P. Giommi, C. Pittoril, F. Verrecchia, P. Santolamazza, D. Gasparrini, S. Cutini, S. Colafrancesco, L. Salotti

备注：
accepted for publication by Astron. & Astrophys, 4 pages, 2 figures, 2 tables
发表信息：
Astron.Astrophys.489:L17-L20,2008
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摘要：

我们介绍了AGILE伽玛射线观测的领域包含令人困惑的伽玛射线源3EG J1835+5918。这个来源是最显著的不明EGRET来源之一。一个前所未有的长AGILE监测这个源产生的重要信息的位置误差箱，通量演变和频谱。3EG J1835+5918在2007年和2008年多次出现在AGILE视野中，从2007年9月4日到2008年6月30日，总共观测了138天，包括几个星期的连续覆盖。AGILE的曝光时间大约是EGRET的两倍，它证实了在与EGRET一致的位置上存在一个突出的伽马射线源（AGL J1836+5926），尽管对于大于100 MeV的光子能量，平均通量值明显较低。对AGL J1836+5926的整个数据集进行了为期5天的箱时间分析，显示了伽马射线通量变化的一些证据。在100 MeV和1 GeV之间的源谱可以用光子指数在1.6-1.7范围内的幂律拟合，与EGRET值完全一致。已被提议作为3EG J1835+5918的可能对应物的微弱X射线源RX J1836.2+5925完全在AGILE错误框内。未来的连续监测（AGILE和GLAST）需要确认伽马射线通量的变化，并揭示源的起源，目前正在通过多波长搜索对应的主题。

英文摘要：

We present the AGILE gamma-ray observations of the field containing the puzzling gamma-ray source 3EG J1835+5918. This source is one of the most remarkable unidentified EGRET sources. An unprecedentedly long AGILE monitoring of this source yields important information on the positional error box, flux evolution, and spectrum. 3EG J1835+5918 has been in the AGILE field of view several times in 2007 and 2008 for a total observing time of 138 days from 2007 Sept 04 to 2008 June 30 encompassing several weeks of continuous coverage. With an exposure time approximately twice that of EGRET, AGILE confirms the existence of a prominent gamma-ray source (AGL J1836+5926) at a position consistent with that of EGRET, although with a remarkably lower average flux value for photon energies greater than 100 MeV. A 5-day bin temporal analysis of the whole data set of AGL J1836+5926 shows some evidence for variability of the gamma-ray flux. The source spectrum between 100 MeV and 1 GeV can be fitted with a power law with photon index in the range 1.6-1.7, fully consistent with the EGRET value. The faint X-ray source RX J1836.2+5925 that has been proposed as a possible counterpart of 3EG J1835+5918 is well within the AGILE error box. Future continuous monitoring (both by AGILE and GLAST) is needed to confirm the gamma-ray flux variability and to unveil the source origin, a subject that is currently being pursued through a multiwavelength search for counterparts.

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