A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment

doi:10.3847/1538-4357/aa97d9

	A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment
	Liu, Bing; Chen, Yang; Zhang, Xiao; Liu, Qian-Cheng; He, Ting-Lan; Zhou, Xin; Zhou, Ping; Su, Yang
刊名	ASTROPHYSICAL JOURNAL
	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.
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/17884]
专题	中国科学院紫金山天文台
推荐引用方式 GB/T 7714	Liu, Bing,Chen, Yang,Zhang, Xiao,et al. A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment[J]. ASTROPHYSICAL JOURNAL,2017,851(1):37.
APA	Liu, Bing.,Chen, Yang.,Zhang, Xiao.,Liu, Qian-Cheng.,He, Ting-Lan.,...&Su, Yang.(2017).A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment.ASTROPHYSICAL JOURNAL,851(1),37.
MLA	Liu, Bing,et al."A Study of Fermi-LAT GeV gamma-Ray Emission toward the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment".ASTROPHYSICAL JOURNAL 851.1(2017):37.