LONG-TERM MONITORING OF MRK 501 FOR ITS VERY HIGH ENERGY gamma EMISSION AND A FLARE IN 2011 OCTOBER

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	LONG-TERM MONITORING OF MRK 501 FOR ITS VERY HIGH ENERGY gamma EMISSION AND A FLARE IN 2011 OCTOBER
	ARGO-YBJ Collaboration
刊名	ASTROPHYSICAL JOURNAL
	2012
卷号	758 期号:1
关键词	ARGO-YBJ EXPERIMENT EXTRAGALACTIC BACKGROUND LIGHT RAY EMISSION TEV BLAZARS RADIATION STATE DETECTOR MARKARIAN-501 VARIABILITY EVOLUTION
通讯作者	Bartoli, B (reprint author), Univ Naples Federico II, Dipartimento Fis, Complesso Univ Monte StAngelo,Via Cinthia, I-80126 Naples, Italy.
英文摘要	As one of the brightest active blazars in both X-ray and very high energy gamma-ray bands, Mrk 501, is very useful for physics associated with jets from active galactic nuclei. The ARGO-YBJ experiment has monitored Mrk 501 for gamma-ray above 0.3 TeV since 2007 November. The largest flare since 2005 was observed from 2011 October and lasted until about 2012 April. In this paper, a detailed analysis of this event is reported. During the brightest gamma-ray flaring episodes from 2011 October 17 to November 22, an excess of the event rate over 6 sigma is detected by ARGO-YBJ in the direction of Mrk 501, corresponding to an increase of the gamma-ray flux above 1 TeV by a factor of 6.6 +/- 2.2 from its steady emission. In particular, the gamma-ray flux above 8 TeV is detected with a significance better than 4 sigma. Based on time-dependent synchrotron self-Compton (SSC) processes, the broadband energy spectrum is interpreted as the emission from an electron energy distribution parameterized with a single power-law function with an exponential cutoff at its high-energy end. The average spectral energy distribution for the steady emission is well described by this simple one-zone SSC model. However, the detection of gamma-ray above 8 TeV during the flare challenges this model due to the hardness of the spectra. Correlations between X-rays and gamma-ray are also investigated.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000309520500002
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213336]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	ARGO-YBJ Collaboration. LONG-TERM MONITORING OF MRK 501 FOR ITS VERY HIGH ENERGY gamma EMISSION AND A FLARE IN 2011 OCTOBER[J]. ASTROPHYSICAL JOURNAL,2012,758(1).
APA	ARGO-YBJ Collaboration.(2012).LONG-TERM MONITORING OF MRK 501 FOR ITS VERY HIGH ENERGY gamma EMISSION AND A FLARE IN 2011 OCTOBER.ASTROPHYSICAL JOURNAL,758(1).
MLA	ARGO-YBJ Collaboration."LONG-TERM MONITORING OF MRK 501 FOR ITS VERY HIGH ENERGY gamma EMISSION AND A FLARE IN 2011 OCTOBER".ASTROPHYSICAL JOURNAL 758.1(2012).