GAMMA-RAY FLARES FROM Mrk421 IN 2008 OBSERVED WITH THE ARGO-YBJ DETECTOR
文献类型：期刊论文
| 作者 | ARGO-YBJ Collaboration |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2010 |
| 卷号 | 714期号:2页码:L208-L212 |
| 关键词 | SPECTRAL ENERGY-DISTRIBUTIONS AIR-SHOWER ARRAY CRAB-NEBULA MAGIC TELESCOPE MARKARIAN-421 BLAZARS OBJECTS VIEW |
| 通讯作者 | Aielli, G (reprint author), Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy. |
| 英文摘要 | 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. |
| 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:000277232000006 |
| 公开日期 | 2016-02-25 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/212943]  |
| 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. 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. |
入库方式： OAI收割
来源：高能物理研究所
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