CygOB2区的INTEGRAL-ISGRI观测：在包含几个非热发射大质量恒星的区域中寻找硬X射线点源
INTEGRAL-ISGRI observations of the CygOB2 region: earching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
摘要：
目的：我们分析了INTEGRAL-ISGRI数据，以探测天鹅座OB 2区域点源的硬X射线发射（20 keV以上），并研究了早期型星（沃尔夫-拉叶星和O型星）的非热高能发射。在位于视野中的目标，我们专注于仍然身份不明的EGRET源3EG 2033+4118，可能与大质量恒星已知的无线电域中产生非热发射，并在广泛的碰撞风二进制WR 140。研究方法：使用大量的数据与IBIS-ISGRI成像仪板载INTEGRAL，我们运行OSA软件包，以找到点源的仪器的完全编码的视野。结果如下：我们的数据不允许检测到3EG J2033+4118的低能对应物，也不允许在视场中检测到任何其他新的点源，并且我们推导出几个目标的高能通量上限：3EG J2033+4118，TeV J2032+4130，WR 140，WR 146和WR 147。结果进行了讨论的背景下，这些对象的多波长调查。结论：得出的上限是有价值的约束模型，旨在了解非热发射的大质量恒星的粒子加速，仍然身份不明的非常高的伽马射线源TeV J2032+4130。
英文摘要：
Aims: We analyze INTEGRAL-ISGRI data in order to probe the hard X-ray emission (above 20 keV) from point sources in the Cyg OB2 region and to investigate the putative non-thermal high-energy emission from early-type stars (Wolf-Rayet and O-type stars). Among the targets located in the field of view, we focus on the still unidentified EGRET source 3EG 2033+4118 that may be related to massive stars known to produce non-thermal emission in the radio domain, and on the wide colliding-wind binary WR 140. Methods: Using a large set of data obtained with the IBIS-ISGRI imager onboard INTEGRAL, we run the OSA software package in order to find point sources in the fully coded field of view of the instrument. Results: Our data do not allow the detection of a lower-energy counterpart of 3EG J2033+4118 nor of any other new point sources in the field of view, and we derive upper limits on the high-energy flux for a few targets: 3EG J2033+4118, TeV J2032+4130, WR140, WR146 and WR147. The results are discussed in the context of the multiwavelength investigation of these objects. Conclusions: The upper limits derived are valuable constraints for models aimed at understanding the acceleration of particles in non-thermal emitting massive stars, and of the still unidentified very-high gamma-ray source TeV J2032+4130.
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