Discovery of very high energy γ-ray emission from the low-frequency-peaked Bl Lacertae object Bl Lacertae

被引：110

作者：

Albert, J.

Aliu, E.

Anderhub, H.

Antoranz, P.

Armada, A.

Baixeras, C.

Barrio, J. A.

Bartko, H.

Bastieri, D.

Becker, J. K.

Bednarek, W.

Berger, K.

Bigongiari, C.

Biland, A.

Bock, R. K.

Bordas, P.

Bosch-Ramon, V.

Bretz, T.

Britvitch, I.

Camara, M.

Carmona, E.

Chilingarian, A.

Coarasa, J. A.

Commichau, S.

Contreras, J. L.

Cortina, J.

Costado, M. T.

Curtef, V.

Danielyan, V.

Dazzi, F.

De Angelis, A.

Delgado, C.

Reyes, R. De Los

De Lotto, B.

Domingo-Santamaria, E.

Dorner, D.

Doro, M.

Errando, M.

Fagiolini, M.

Ferenc, D.

Fernandez, E.

Firpo, R.

Flix, J.

Fonseca, M. V.

Font, L.

Fuchs, M.

Galante, N.

Garcia-Lopez, R.

Garczarczyk, M.

Gaug, M.

机构：

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

[2] Inst Fis Altes Energies, E-08193 Bellaterra, Spain

[3] ETH, CH-8093 Zurich, Switzerland

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

[5] Univ Autonoma Barcelona, E-08193 Barcelona, Spain

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

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

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

[9] Univ Dortmund, D-44227 Dortmund, Germany

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

[11] Univ Barcelona, E-08028 Barcelona, Spain

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

[13] Inst Astrofis Canarias, E-38200 Tenerife, Spain

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

[15] Ist Nazl Fis Nucl Trieste, I-33100 Udine, Italy

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

[17] Ist Nazl Fis Nucl Pisa, I-53100 Siena, Italy

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

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

[20] Turku Univ, Tuoorla Observ, FI-21500 Piikkio, Finland

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

[22] INAF, Osservatorio Astron Trieste, I-34131 Trieste, Italy

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

[24] CSIC, IEEC, Inst Ciencies Espai, E-08193 Barcelona, Spain

[25] ICREA, E-08193 Barcelona, Spain

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 666卷 / 01期

关键词：

BL Lacertae objects : individual (BL Lacertae); gamma rays : observations;

D O I：

10.1086/521550

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and for 26 hr during 2006 July to September. The source is the historical prototype and eponym of a class of low-frequency-peaked BL Lacertae (LBL) objects. A very high energy (VHE) gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of (0.6 +/- 0.2) x 10(-11) cm(-2) S-1 was measured, corresponding to approximately 3% of the Crab flux. The differential spectrum between 150 and 900 GeV is rather steep with a photon index of -3.6 +/- 0.5. The light curve shows no significant variability during the observations in 2005. For the first time a clear detection of VHE gamma-ray emission from an LBL object was obtained with a signal below previous upper limits. The 2006 data show no significant excess. This drop in flux follows the observed trend in optical activity.

引用

页码：L17 / L20

页数：4

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