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题名: A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment
作者: Liu, Bing; Chen, Yang; Zhang, Xiao; Liu, Qian-Cheng; He, Ting-Lan; Zhou, Xin; Zhou, Ping; Su, Yang
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 851, 期号:1, 页码:37
DOI: 10.3847/1538-4357/aa97d9
英文摘要: We report our independent Gey gamma-ray study the young shell-type supernova remnant (SNR) Kes 73, which harbors a central magnetar, and CO-line millimeter observations toward the SNR. Using 7.6 years of Fermi-LAT observation data, we detected an extended gamma-ray source ("source A") with centroid on the west of the SNR, with a significance of 21 sigma in 0.1-300 GeV and an error circle of 5'.4n angular radius. The gamma-ray spectrum cannot be reproduced by a pure leptonic emission or a pure emission from the magnetar, and thus a hadronic emission component is needed. The CO-line observations reveal a molecular cloud (MC) at V-LSR similar to 90 km s(-1), which demonstrates morphological correspondence with the western boundary of the SNR brightened in multiwavelength. The (CO)-C-12 (J-1)/(CO)-C-12 (J-1-0)retioin the left (blue) wing 85-88 km s(-1) is prominently elevated to similar to 1.1 along the northwestern boundary, providing kinematic evidence of the SNR-MC interaction. This SNR-MC association yields a kinematic distance 9 kpc to Kes 73. The MC is shown to be capable of accounting for the hadronic gamma ray emission component. The gamma-ray spectrum can be interpreted with a pure hadronic emission or a magnetar+ hadronic hybrid emission. In the case of pure hadronic emission, the spectral index of the protons is 2.4, very similar to that of the radio-emitting electrons, essentially consistent with the diffusive shock acceleration theory. In the case of magnetar+ hadronic hybrid emission, a magnetic field decay rate. 1036 erg s(-1) is needed to power the magnetar's curvature radiation.
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17884
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