Discovery of very high energy gamma rays from 1ES 1218+30.4

被引：98

作者：

Albert, J.

Aliu, E.

Anderhub, H.

Antoranz, P.

Armada, A.

Asensio, M.

Baixeras, C.

Barrio, J. A.

Bartelt, M.

Bartko, H.

Bastieri, D.

Bavikadi, S. R.

Bednarek, W.

Berger, K.

Bigongiari, C.

Biland, A.

Bisesi, E.

Bock, R. K.

Bretz, T.

Britvitch, I.

Camara, M.

Chilingarian, A.

Ciprini, S.

Coarasa, J. A.

Commichau, S.

Contreras, J. L.

Cortina, J.

Curtef, V.

Danielyan, V.

Dazzi, F.

De Angelis, A.

de los Reyes, R.

De Lotto, B.

Domingo-Santamari, E.

Dorner, D.

Doro, M.

Errando, M.

Fagiolini, M.

Ferenc, D.

Fernandez, E.

Firpo, R.

Flix, J.

Fonseca, M. V.

Font, L.

Galante, N.

Garczarczyk, M.

Gaug, M.

Giller, M.

Goebel, F.

Hakobyan, D.

机构：

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

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

[3] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland

[4] Univ Complutense Madrid, Grp Altas Energias, Dept Fis Atom Mol & Nucl, E-28040 Madrid, Spain

[5] Univ Autonoma Barcelona, Dept Fis, Grp Fis Radiac, E-08193 Bellaterra, Spain

[6] Univ Dortmund, Fachbereich Phys, D-44227 Dortmund, Germany

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

[8] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

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

[10] Univ Udine, Dipartimento Fis, I-33100 Udine, Italy

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

[12] Univ Lodz, Inst Fizyki, PL-90236 Lodz, Poland

[13] Yerevan Phys Inst, Cosm Ray Div, Yerevan 375036, Armenia

[14] Tuorla Observ, FI-21500 Piikkio, Finland

[15] Univ Siena, Dipartimento Fis, I-53100 Siena, Italy

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

[17] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[18] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[19] Univ Trieste, Dipartimento Fis, I-34012 Trieste, Italy

[20] Ist Nazl Fis Nucl, I-34012 Trieste, Italy

[21] Inst Yadreni Izsledvaniya & Yadena Energet, BG-1784 Sofia, Bulgaria

[22] Osserv Astron Trieste, INAF, I-34100 Trieste, Italy

[23] Ist Nazl Fis Nucl, I-34100 Trieste, Italy

[24] Univ Pisa, Dipartimento Fis, I-56126 Pisa, Italy

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

[26] Univ Autonoma Barcelona, Inst Ciencies Espai, E-08193 Bellaterra, Spain

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 642卷 / 02期

关键词：

BL Lacertae objects : individual (1ES 1218+30.4); gamma rays : observations;

D O I：

10.1086/504845

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218 + 30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 sigma significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F-E = (8.1 +/- 2.1) x 10(-7)[E/(250 GeV)](-3.0 +/- 0.4) TeV-1 F (E) m(-2) s(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.

引用

页码：L119 / L122

页数：4

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