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arXiv 0810.0008astro-ph
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用AGILE发现PSR J2021 +3651的高能Gamma-Ray脉动

Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE

J. P. Halpern, F. Camilo, A. Giuliani, E. V. Gotthelf, M. A. McLaughlin, R. Mukherjee, A. Pellizzoni, S. M. Ransom, M. S. E. Roberts, M. Tavani

摘要:

射电脉冲星PSR J2021+3651是在康普顿伽马射线天文台任务结束后发现的,长期以来一直被认为是高能伽马射线源2CG 075+00 = 3EG J2021+3716 = GeV J2020+3658的可能对应物,但由于缺乏同时期的射电脉冲星星历来折叠稀疏的,存档的伽马射线光子在这里,我们报告发现的伽玛射线脉动PSR J2021+3651在100-1500兆电子伏的范围内使用的数据从AGILE卫星收集了8个月,折叠在一个密集的采样,同期无线电星历为此目的在绿岸望远镜。伽马射线脉冲由两个尖峰组成,它们之间相隔0.47+/-0.01个周期。单个无线电脉冲领先第一个伽马射线峰值0.165+/-0.010个周期。这些性质与其他伽马射线辐射的性质相似,并且峰值的相位关系可以在伽马射线辐射的外隙加速器模型的上下文中解释。脉冲相位分辨图像显示,在先前包含混淆源3EG J2021+3716和3EG J2016+3657的区域中,只有一个主导源,AGL J2020.5+3653 = PSR J2021 + 3651。

英文摘要:

Discovered after the end of the Compton Gamma-Ray Observatory mission, the radio pulsar PSR J2021+3651 was long considered a likely counterpart of the high-energy gamma-ray source 2CG 075+00 = 3EG J2021+3716 = GeV J2020+3658, but it could not be confirmed due to the lack of a contemporaneous radio pulsar ephemeris to fold the sparse, archival gamma-ray photons. Here, we report the discovery of gamma-ray pulsations from PSR J2021+3651 in the 100-1500 MeV range using data from the AGILE satellite gathered over 8 months, folded on a densely sampled, contemporaneous radio ephemeris obtained for this purpose at the Green Bank Telescope. The gamma-ray pulse consists of two sharp peaks separated by 0.47+/-0.01 cycles. The single radio pulse leads the first gamma-ray peak by 0.165+/-0.010 cycles. These properties are similar to those of other gamma-ray pulsars, and the phase relationship of the peaks can be interpreted in the context of the outer-gap accelerator model for gamma-ray emission. Pulse-phase resolved images show that there is only one dominant source, AGL J2020.5+3653 = PSR J2021+3651 in the region previously containing confused sources 3EG J2021+3716 and 3EG J2016+3657.

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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