Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622+3749 Observed by LHAASO-KM2A
Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622+3749 Observed by LHAASO-KM2A
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LHAASO-KM2A 观测到 PSR J0622 3749 周围的扩展甚高能伽马射线发射
DOI：
10.1103/physrevlett.126.241103
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发表时间：
2021-06-16
影响因子：
8.6
通讯作者：
Huang, X. Y.
中科院分区：
文献类型：
--
作者：
Aharonian, F.;An, Q.;Huang, X. Y.
我们报告了一个扩展的甚高能量（VHE）的伽马射线源周围的中年（207.8 kyr）脉冲星PSR J 0622 +3749的位置与大型高海拔空气淋浴天文台（LHAASO）的发现。假设高斯模板，对于E>25 TeV，以8.2σ的显著性检测源。最佳拟合位置为（赤Ascension，赤经）=（95.47°±0.11°，37.92 °±0.09°），最佳拟合位置为（赤经，赤经）=（95.47°±0.11°，37.92 °±0.09°），最佳拟合位置为（赤经，赤经）=（95.47 ° ± 0.11°，37.92 ° ± 0.09°），最佳拟合位置为（0.40°±0.07°）。能谱可用指数为-2.92 0. 17_{stat}±0.02_{sys}的幂律谱描述。没有明确的扩展多波长对应的LHAASO源已被发现从无线电到sub-TeV波段。LHAASO的观测结果与VHE电子从脉冲星逃逸，在星际介质中扩散，并散射星际辐射场的假设一致。如果解释为脉冲星晕的情况下，扩散系数，推断的电子与平均能量为160 TeV，是一致的，从周围的扩展晕Geminga和Monogem和远小于来自宇宙射线秒。因此，LHAASO发现这个来源可能丰富了所谓的脉冲星晕的类别，并证实高能粒子通常在脉冲星周围的扰动介质中扩散非常缓慢。
We report the discovery of an extended very-high-energy (VHE) gamma-ray source around the location of the middle-aged (207.8 kyr) pulsar PSR J0622+3749 with the Large High-Altitude Air Shower Observatory (LHAASO). The source is detected with a significance of 8.2σ for E>25 TeV assuming a Gaussian template. The best-fit location is (right ascension, declination) =(95.47°±0.11°,37.92°±0.09°), and the extension is 0.40°±0.07°. The energy spectrum can be described by a power-law spectrum with an index of -2.92±0.17_{stat}±0.02_{sys}. No clear extended multiwavelength counterpart of the LHAASO source has been found from the radio to sub-TeV bands. The LHAASO observations are consistent with the scenario that VHE electrons escaped from the pulsar, diffused in the interstellar medium, and scattered the interstellar radiation field. If interpreted as the pulsar halo scenario, the diffusion coefficient, inferred for electrons with median energies of ∼160 TeV, is consistent with those obtained from the extended halos around Geminga and Monogem and much smaller than that derived from cosmic ray secondaries. The LHAASO discovery of this source thus likely enriches the class of so-called pulsar halos and confirms that high-energy particles generally diffuse very slowly in the disturbed medium around pulsars.