Observations of selected AGN with HESS

被引：68

作者：

Aharonian, F ^{[1
]}

Akhperjanian, AG

Bazer-Bachi, AR

Beilicke, M

Benbow, W

Berge, D

Bernlöhr, K

Boisson, C

Bolz, O

Borrel, V

Braun, I

Breitling, F

Brown, AM

Chadwick, PM

Chounet, LM

Cornils, R

Costamante, L

Degrange, B

Dickinson, HJ

Djannati-Atai, A

Drury, LOC

Dubus, G

Emmanoulopoulos, D

Espigat, P

Feinstein, F

Fontaine, G

Fuchs, Y

Funk, S

Gallant, YA

Giebels, B

Gillessen, S

Glicenstein, JF

Goret, P

Hadjichristidis, C

Hauser, M

Heinzelmann, G

Henri, G

Hermann, G

Hinton, JA

Hofmann, W

Holleran, M

Horns, D

Jacholkowska, A

de Jager, OC

Khélifi, B

Komin, N

Konopelko, A

Latham, IJ

Le Gallou, R

Lemière, A

机构：

[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[2] Yerevan Phys Inst, Yerevan, Armenia

[3] CNRS, Ctr Etud Spatiale Rayonnements, UPS, Toulouse, France

[4] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

[5] Humboldt Univ, Inst Phys, Berlin, Germany

[6] Observ Paris, CNRS, LUTH, UMR 8102,Sect Meudon, F-92195 Meudon, France

[7] Univ Durham, Dept Phys, Durham DH1 3HP, England

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

[9] APC, Paris, France

[10] Dublin Inst Adv Studies, Dublin 4, Ireland

[11] Konigstuhl, Landessternwarte, Heidelberg, Germany

[12] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor & Astroparticles, F-34095 Montpellier, France

[13] Univ Grenoble 1, CNRS, INSU, Astrophys Lab, F-38041 Grenoble, France

[14] CE Saclay, CEA, DSM, DAPNIA, Gif Sur Yvette, France

[15] NW Univ, Unit Space Phys, Potchefstroom, South Africa

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

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

[18] Ruhr Univ Bochum, Lehrstuhl 4, Inst Theoret Phys, D-4630 Bochum, Germany

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

[20] Univ Namibia, Windhoek, Namibia

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 441卷 / 02期

关键词：

galaxies : active; BL Lacertae objects : general; gamma rays : observations;

D O I：

10.1051/0004-6361:20053478

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A sample of selected active galactic nuclei (AGN) was observed in 2003 and 2004 with the High Energy Stereoscopic System (HESS), an array of imaging atmospheric-Cherenkov telescopes in Namibia. The redshifts of these candidate very-high-energy (VHE, > 100 GeV) gamma-ray emitters range from z = 0.00183 to z = 0.333. Significant detections were already reported for some of these objects, such as PKS 2155-304 and Markarian 421. Marginal evidence (3.1 sigma) for a signal is found from large-zenith-angle observations of Markarian 501, corresponding to an integral flux of I(> 1.65 TeV) = (1.5 +/- 0.6(stat)+/- 0.3(syst)) x 10(-12) cm(-2) s(-1) or similar to 15% of the Crab Nebula flux. Integral flux upper limits for 19 other AGN, based on exposures of similar to 1 to similar to 8 h live time, and with average energy thresholds between 160 GeV and 610 GeV, range from 0.4% to 5.1% of the Crab Nebula flux. All the upper limits are the most constraining ever reported for these objects.

引用

页码：465 / 472

页数：8

共 52 条

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