VERY HIGH ENERGY GAMMA-RAY OBSERVATIONS OF STRONG FLARING ACTIVITY IN M87 IN 2008 FEBRUARY

被引：92

作者：

Albert, J. ^{[2
]}

Aliu, E. ^{[1
]}

Anderhub, H. ^{[3
]}

Antonelli, L. A. ^{[4
]}

Antoranz, P. ^{[5
]}

Backes, M. ^{[6
]}

Baixeras, C. ^{[7
]}

Barrio, J. A. ^{[5
]}

Bartko, H. ^{[8
]}

Bastieri, D. ^{[9
,10
]}

Becker, J. K. ^{[6
]}

Bednarek, W. ^{[11
]}

Berger, K. ^{[2
]}

Bernardini, E. ^{[12
]}

Bigongiari, C. ^{[9
,10
]}

Biland, A. ^{[3
]}

Bock, R. K. ^{[8
,9
,10
]}

Bonnoli, G. ^{[13
,14
]}

Bordas, P. ^{[15
]}

Bosch-Ramon, V. ^{[15
]}

Bretz, T. ^{[2
]}

Britvitch, I. ^{[3
]}

Camara, M. ^{[5
]}

Carmona, E. ^{[8
]}

Chilingarian, A. ^{[16
]}

Commichau, S. ^{[3
]}

Contreras, J. L. ^{[5
]}

Cortina, J. ^{[1
]}

Costado, M. T. ^{[17
,18
]}

Covino, S. ^{[4
]}

Curtef, V. ^{[6
]}

Dazzi, F. ^{[9
,10
]}

De Angelis, A. ^{[19
,20
]}

De Cea del Pozo, E. ^{[21
]}

de los Reyes, R. ^{[5
]}

De Lotto, B. ^{[19
,20
]}

De Maria, M. ^{[19
,20
]}

De Sabata, F. ^{[19
,20
]}

Delgado Mendez, C. ^{[17
]}

Dominguez, A. ^{[22
]}

Dorner, D. ^{[2
]}

Doro, M. ^{[9
,10
]}

Errando, M. ^{[1
]}

Fagiolini, M. ^{[13
,14
]}

Ferenc, D. ^{[23
]}

Fernandez, E. ^{[1
]}

Firpo, R. ^{[1
]}

Fonseca, M. V. ^{[5
]}

Font, L. ^{[7
]}

Galante, N. ^{[8
]}

机构：

[1] IFAE, E-08193 Bellaterra, Spain

[2] Univ Wurzburg, D-97074 Wurzburg, Germany

[3] ETH, CH-8093 Zurich, Switzerland

[4] INAF Natl Inst Astrophys, I-00136 Rome, Italy

[5] Univ Complutense, E-28040 Madrid, Spain

[6] Tech Univ Dortmund, D-44221 Dortmund, Germany

[7] Univ Autonoma Barcelona, E-08193 Bellaterra, Spain

[8] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[9] Univ Padua, I-35131 Padua, Italy

[10] Ist Nazl Fis Nucl, I-35131 Padua, Italy

[11] Univ Lodz, PL-90236 Lodz, Poland

[12] DESY, D-15738 Zeuthen, Germany

[13] Univ Siena, I-53100 Siena, Italy

[14] INFN Pisa, I-53100 Siena, Italy

[15] Univ Barcelona, ICC IEEC, E-08028 Barcelona, Spain

[16] Yerevan Phys Inst, AM-375036 Yerevan, Armenia

[17] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain

[18] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[19] Univ Udine, I-33100 Udine, Italy

[20] INFN Trieste, I-33100 Udine, Italy

[21] CSIC, IEEC, Inst Ciencies Espai, E-08193 Bellaterra, Spain

[22] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[23] Univ Calif Davis, Davis, CA 95616 USA

[24] Turku Univ, Tuorla Observ, FI-21500 Piikkio, Finland

[25] Inst Nucl Energy Res, BG-1784 Sofia, Bulgaria

[26] Humboldt Univ, D-12489 Berlin, Germany

[27] INAF Osservatorio Astron, I-34143 Trieste, Italy

[28] Ist Nazl Fis Nucl, I-34143 Trieste, Italy

[29] ICREA, E-08010 Barcelona, Spain

[30] Univ Pisa, I-56126 Pisa, Italy

[31] Ist Nazl Fis Nucl, I-56126 Pisa, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 685卷 / 01期

关键词：

galaxies: active; galaxies:; individual; (M87; NGC; 4486); gamma rays: observations;

D O I：

10.1086/592348

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

M87 is the only known nonblazar radio galaxy to emit very high energy (VHE) gamma rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable above 350 GeV on a timescale as short as 1 day at a significance level of 5.6 sigma. The highest measured flux reached 15% of the Crab Nebula flux. We observed several substantial changes of the flux level during the 13 day observing period. The flux at lower energies (150-350 GeV), instead, is compatible with being constant. The energy spectrum can be described by a power law with a photon index of 2.30 +/- 0.11(stat) +/- 0.20(syst). The observed day-scale flux variability at VHE prefers the M87 core as source of the emission and implies that either the emission region is very compact (just a few Schwarzschild radii) or the Doppler factor of the emitting blob is rather large in the case of a nonexpanding emission region.

引用

页码：L23 / L26

页数：4

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