SUPERNOVA REMNANT KESTEVEN 27: INTERACTION WITH A NEIGHBOR HI CLOUD VIEWED BY FERMI

被引：9
|
作者：
Xing, Yi [1 ]
Wang, Zhongxiang [1 ]
Zhang, Xiao [2 ]
Chen, Yang [2 ,3 ]
机构：
[1] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
[2] Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2015年 / 805卷 / 01期
基金：
中国国家自然科学基金;
关键词：
acceleration of particles; gamma rays: ISM; ISM: individual objects (Kesteven 27); ISM: supernova remnants; LARGE-AREA TELESCOPE; GAMMA-RAY EMISSION; ACCUMULATED DIFFUSIVE PROTONS; MOLECULAR CLOUDS; LAT OBSERVATIONS; RX J1713.7-3946; CATALOG; DISCOVERY; ACCELERATION; W28;
D O I：
10.1088/0004-637X/805/1/19
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report on the likely detection of gamma-ray emission from the supernova remnant (SNR) Kesteven 27 (Kes 27). We analyze 5.7 yr Fermi Large Area Telescope data of the SNR region and find an unresolved source at a position consistent with the radio brightness peak and the X-ray knot of Kes 27, which is located in the eastern region of the SNR and caused by its interaction with a nearby HI cloud. The source's emission is best fit with a power-law spectrum with a photon index of 2.5 +/- 0.1 and a >0.2 GeV luminosity of 5.8 x 10(34) erg s(-1) assuming a distance of 4.3 kpc, as derived from radio observations of the nearby HI cloud. Comparing the properties of the source with that of other SNRs that are known to be interacting with nearby high-density clouds, we discuss the origin of the source's emission. The spectral energy distribution of the source can be described by a hadronic model that considers the interaction of energetic protons escaping from the shock front of Kes 27 with a high-density cloud.
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页数：6
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