Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
复制标题
使用 AGILE 从 PSR J2021 3651 发现高能伽马射线脉动
DOI：
10.1086/594117
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
M. Tavani
中科院分区：
文献类型：
--
作者：
J. Halpern;F. Camilo;A. Giuliani;E. Gotthelf;M. McLaughlin;R. Mukherjee;A. Pellizzoni;S. Ransom;M. Roberts;M. Tavani
康普顿伽马射线天文台任务结束后发现的射电脉冲星 PSR J2021+3651 长期以来一直被认为可能是高能 γ 射线源 2CG 075+00 = 3EG J2021+3716 = GeV J2020+3658 的对应物，但由于缺乏同期射电脉冲星星历来折叠该星历而无法得到证实。稀疏的档案 γ 射线光子。在这里，我们报告了利用 AGILE 卫星在 8 个月内收集的数据，发现了 PSR J2021+3651 在 100-1500 MeV 范围内的 γ 射线脉动，这些数据折叠在绿岸望远镜为此目的获得的密集采样的同期射电星历表上。 γ 射线脉冲由两个相隔 0.47 ± 0.01 周期的尖峰组成。单个射电脉冲领先第一个 γ 射线峰值 0.165 ± 0.010 个周期。这些特性与其他 γ 射线脉冲星的特性相似，并且峰值的相位关系可以在 γ 射线发射的外间隙加速器模型的背景下解释。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，只有一个主要源，AGL J2020.5+3653 = PSR J2021+3651。
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 γ-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 γ-ray photons. Here, we report the discovery of γ-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 γ-ray pulse consists of two sharp peaks separated by 0.47 ± 0.01 cycles. The single radio pulse leads the first γ-ray peak by 0.165 ± 0.010 cycles. These properties are similar to those of other γ-ray pulsars, and the phase relationship of the peaks can be interpreted in the context of the outer-gap accelerator model for γ-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.