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GAMMA-RAY FLARES FROM Mrk421 IN 2008 OBSERVED WITH THE ARGO-YBJ DETECTOR
ARGO-YBJ Collaboration
2010
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号714期号:2页码:L208-L212
通讯作者Aielli, G (reprint author), Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy.
摘要In 2008, the blazar Markarian 421 entered a very active phase and was one of the brightest sources in the sky at TeV energies, showing frequent flaring episodes. Using the data of ARGO-YBJ, a full coverage air shower detector located at Yangbajing (4300 m a.s.l., Tibet), we monitored the source at gamma-ray energies E > 0.3 TeV during the whole year. The observed flux was variable, with the strongest flares in March and June, in correlation with X-ray enhanced activity. While during specific episodes the TeV flux could be several times larger than the Crab Nebula one, the average emission from day 41 to 180 was almost twice the Crab level, with an integral flux of (3.6 +/- 0.6) x 10(-11) photons cm(-2) s(-1) for energies E > 1 TeV, and decreased afterward. This Letter concentrates on the flares that occurred in the first half of June. This period has been deeply studied from optical to 100 MeV gamma rays, and partially up to TeV energies, since the moonlight hampered the Cherenkov telescope observations during the most intense part of the emission. Our data complete these observations, with the detection of a signal with a statistical significance of 3.8 standard deviations on June 11-13, corresponding to a gamma-ray flux about 6 times larger than the Crab one above 1 TeV. The reconstructed differential spectrum, corrected for the intergalactic absorption, can be represented by a power law with an index alpha = -2.1(-0.5)(+0.7) extending up to several TeV. The spectrum slope is fully consistent with previous observations reporting a correlation between the flux and the spectral index, suggesting that this property is maintained in different epochs and characterizes the source emission processes.
关键词SPECTRAL ENERGY-DISTRIBUTIONS AIR-SHOWER ARRAY CRAB-NEBULA MAGIC TELESCOPE MARKARIAN-421 BLAZARS OBJECTS VIEW
学科领域Astronomy & Astrophysics
DOI10.1088/2041-8205/714/2/L208
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000277232000006
引用统计
被引频次:40[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/311005/212943
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. GAMMA-RAY FLARES FROM Mrk421 IN 2008 OBSERVED WITH THE ARGO-YBJ DETECTOR[J]. ASTROPHYSICAL JOURNAL LETTERS,2010,714(2):L208-L212.
APA ARGO-YBJ Collaboration.(2010).GAMMA-RAY FLARES FROM Mrk421 IN 2008 OBSERVED WITH THE ARGO-YBJ DETECTOR.ASTROPHYSICAL JOURNAL LETTERS,714(2),L208-L212.
MLA ARGO-YBJ Collaboration."GAMMA-RAY FLARES FROM Mrk421 IN 2008 OBSERVED WITH THE ARGO-YBJ DETECTOR".ASTROPHYSICAL JOURNAL LETTERS 714.2(2010):L208-L212.
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