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IDENTIFICATION OF THE TeV GAMMA-RAY SOURCE ARGO J2031+4157 WITH THE CYGNUS COCOON
ARGO-YBJ Collaboration
2014
发表期刊ASTROPHYSICAL JOURNAL
卷号790期号:2
通讯作者Chen, SZ (reprint author), Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, POB 918, Beijing 100049, Peoples R China.
摘要The extended TeV gamma-ray source ARGO J2031+4157 (or MGRO J2031+41) is positionally consistent with the Cygnus Cocoon discovered by Fermi-LAT at GeV energies in the Cygnus superbubble. Reanalyzing the ARGO-YBJ data collected from 2007 November to 2013 January, the angular extension and energy spectrum of ARGO J2031+4157 are evaluated. After subtracting the contribution of the overlapping TeV sources, the ARGO-YBJ excess map is fitted with a two-dimensional Gaussian function in a square region of 10 degrees x 10 degrees, finding a source extension sigma(ext) = 1 degrees.8 +/- 0 degrees.5. The observed differential energy spectrum is dN/dE = (2.5 +/- 0.4) x 10(-11)(E/1 TeV)(-2.6 +/- 0.3) photons cm(-2) s(-1) TeV-1, in the energy range 0.2-10 TeV. The angular extension is consistent with that of the Cygnus Cocoon as measured by Fermi-LAT and the spectrum also shows a good connection with the one measured in the 1-100 GeV energy range. These features suggest to identify ARGO J2031+4157 as the counterpart of the Cygnus Cocoon at TeV energies. The Cygnus Cocoon, located in the star-forming region of Cygnus X, is interpreted as a cocoon of freshly accelerated cosmic rays related to the Cygnus superbubble. The spectral similarity with supernova remnants (SNRs) indicates that the particle acceleration inside a superbubble is similar to that in an SNR. The spectral measurements from 1 GeV to 10 TeV allows for the first time to determine the possible spectrum slope of the underlying particle distribution. A hadronic model is adopted to explain the spectral energy distribution.
关键词YBJ DETECTOR SUPERNOVA-REMNANTS PARTICLE-ACCELERATION MGRO J2019+37 EMISSION J2032+4130 MILAGRO REGION GALAXY FERMI
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/790/2/152
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000339115800069
引用统计
被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213742
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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ARGO-YBJ Collaboration. IDENTIFICATION OF THE TeV GAMMA-RAY SOURCE ARGO J2031+4157 WITH THE CYGNUS COCOON[J]. ASTROPHYSICAL JOURNAL,2014,790(2).
APA ARGO-YBJ Collaboration.(2014).IDENTIFICATION OF THE TeV GAMMA-RAY SOURCE ARGO J2031+4157 WITH THE CYGNUS COCOON.ASTROPHYSICAL JOURNAL,790(2).
MLA ARGO-YBJ Collaboration."IDENTIFICATION OF THE TeV GAMMA-RAY SOURCE ARGO J2031+4157 WITH THE CYGNUS COCOON".ASTROPHYSICAL JOURNAL 790.2(2014).
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