Detection of the BL Lac Object 1ES 1426+428 in the Very High Energy gamma-ray band by the CAT telescope from 1998-2000

被引：34

作者：

Djannati-Ataï, A

Khelifi, B

Vorobiov, S

Bazer-Bachi, R

Chounet, LM

Debiais, G

Degrange, B

Espigat, P

Fabre, B

Fontaine, G

Goret, P

Gouiffes, C

Masterson, C

Piron, F

Punch, M

Rivoal, M

Rob, L

Tavernet, JP

机构：

[1] Coll France, CNRS, IN2P3, F-75231 Paris 05, France

[2] Univ Paris 07, F-75231 Paris 05, France

[3] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[4] Univ Toulouse 3, CNRS, INSU, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France

[5] Univ Perpignan, Grp Phys Fondamentale, F-66860 Perpignan, France

[6] Ctr Etud Saclay, Serv Astrophys, CEA, DSM,DAPNIA, F-91191 Gif Sur Yvette, France

[7] Univ Paris 06, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, F-75252 Paris 05, France

[8] Univ Paris 07, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, F-75252 Paris 05, France

[9] Charles Univ Prague, Inst Nucl & Particle Phys, CR-11636 Prague, Czech Republic

来源：

ASTRONOMY & ASTROPHYSICS | 2002年 / 391卷 / 03期

关键词：

galaxies : active; galaxies : nuclei; BL Lacertae objects : individual : 1ES 1426+428; gamma-rays : observations;

D O I：

10.1051/0004-6361:20021034

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The BL Lac Object 1ES 1426+428, at a red-shift of z = 0.129, has been monitored by the CAT telescope from February 1998 to June 2000. The accumulation of 26 h of observations shows a gamma-ray signal of 321 events above 250 GeV at 5.2 standard deviations, determined using data analysis cuts adapted to a weak, steep-spectrum source. The source emission has an average flux of Phi(diff)(400 GeV) = 6.73 +/- 1.27(stat) +/- 1.45(syst) x 10(-11) cm(-2) s(-1) TeV-1, and a very steep spectrum, with a differential spectral index of gamma = 3.60 +/- 0.57 which can be refined to gamma = 3.66 +/- 0.41 using a higher flux data subset. If, as expected from its broad-band properties, the Very High Energy emission is hard at the source, these observations support a strong absorption effect of gamma-rays by the Intergalactic Infrared field.

引用

页码：L25 / L28

页数：4

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