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LONG-TERM MONITORING OF THE TeV EMISSION FROM Mrk 421 WITH THE ARGO-YBJ EXPERIMENT
ARGO-YBJ Collaboration
2011
发表期刊ASTROPHYSICAL JOURNAL
卷号734期号:2
通讯作者Bartoli, B (reprint author), Univ Naples Federico II, Dipartimento Fis, Complesso Univ Monte St Angelo,Via Cinthia, I-80126 Naples, Italy.
摘要ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report a long-term monitoring of Mrk 421 over the period from 2007 November to 2010 February. This source was observed by the satellite-borne experiments Rossi X-ray Timing Explorer and Swift in the X-ray band. Mrk 421 was especially active in the first half of 2008. Many flares are observed in both X-ray and gamma-ray bands simultaneously. The gamma-ray flux observed by ARGO-YBJ has a clear correlation with the X-ray flux. No lag between the X-ray and gamma-ray photons longer than 1 day is found. The evolution of the spectral energy distribution is investigated by measuring spectral indices at four different flux levels. Hardening of the spectra is observed in both X-ray and gamma-ray bands. The gamma-ray flux increases quadratically with the simultaneously measured X-ray flux. All these observational results strongly favor the synchrotron self-Compton process as the underlying radiative mechanism.
关键词BL-LAC OBJECTS ACTIVE GALAXY MARKARIAN-421 GAMMA-RAY OBSERVATION AIR-SHOWER ARRAY MULTIWAVELENGTH OBSERVATIONS CRAB-NEBULA CORRELATED VARIABILITY BLAZAR MARKARIAN-421 GALACTIC NUCLEI DETECTOR
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/734/2/110
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000291386500038
引用统计
被引频次:46[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/311005/213058
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. LONG-TERM MONITORING OF THE TeV EMISSION FROM Mrk 421 WITH THE ARGO-YBJ EXPERIMENT[J]. ASTROPHYSICAL JOURNAL,2011,734(2).
APA ARGO-YBJ Collaboration.(2011).LONG-TERM MONITORING OF THE TeV EMISSION FROM Mrk 421 WITH THE ARGO-YBJ EXPERIMENT.ASTROPHYSICAL JOURNAL,734(2).
MLA ARGO-YBJ Collaboration."LONG-TERM MONITORING OF THE TeV EMISSION FROM Mrk 421 WITH THE ARGO-YBJ EXPERIMENT".ASTROPHYSICAL JOURNAL 734.2(2011).
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