DISCOVERY OF VERY HIGH ENERGY γ-RAY EMISSION FROM CENTAURUS A WITH HESS

被引：178

作者：

Aharonian, F. ^{[2
,30
]}

Akhperjanian, A. G. ^{[3
]}

Anton, G. ^{[4
]}

de Almeida, U. Barres ^{[5
]}

Bazer-Bachi, A. R. ^{[6
]}

Becherini, Y. ^{[7
]}

Behera, B. ^{[8
]}

Benbow, W. ^{[9
]}

Bernloehr, K. ^{[10
,30
]}

Boisson, C. ^{[1
]}

Bochow, A. ^{[30
]}

Borrel, V. ^{[6
]}

Brion, E. ^{[11
]}

Brucker, J. ^{[4
]}

Brun, P. ^{[11
]}

Buehler, R. ^{[30
]}

Bulik, T. ^{[12
]}

Buesching, I. ^{[13
]}

Boutelier, T. ^{[14
]}

Chadwick, P. M. ^{[5
]}

Charbonnier, A. ^{[15
]}

Chaves, R. C. G. ^{[30
]}

Cheesebrough, A. ^{[5
]}

Chounet, L. -M. ^{[16
]}

Clapson, A. C. ^{[30
]}

Coignet, G. ^{[17
]}

Dalton, M. ^{[10
]}

Daniel, M. K. ^{[5
]}

Davids, I. D. ^{[13
,18
]}

Degrange, B. ^{[16
]}

Deil, C. ^{[30
]}

Dickinson, H. J. ^{[5
]}

Djannati-Atai, A. ^{[7
]}

Domainko, W. ^{[30
]}

Drury, L. O'C. ^{[2
]}

Dubois, F. ^{[17
]}

Dubus, G. ^{[14
]}

Dyks, J. ^{[12
]}

Dyrda, M. ^{[19
]}

Egberts, K. ^{[30
]}

Emmanoulopoulos, D. ^{[8
]}

Espigat, P. ^{[7
]}

Farnier, C. ^{[20
]}

Feinstein, F. ^{[20
]}

Fiasson, A. ^{[20
]}

Foerster, A. ^{[30
]}

Fontaine, G. ^{[16
]}

Fuessling, M. ^{[10
]}

Gabici, S. ^{[2
]}

Gallant, Y. A. ^{[20
]}

机构：

[1] Univ Paris, CNRS, Observ Paris, LUTH, F-92190 Meudon, France

[2] Dublin Inst Adv Studies, Dublin 2, Ireland

[3] Yerevan Phys Inst, Yerevan 375036, Armenia

[4] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[5] Univ Durham, Dept Phys, Durham DH1 3LE, England

[6] UPS 47, CNRS, Ctr Etud Spatiale Rayonnements, F-31029 Toulouse 4, France

[7] Univ Paris 07, CNRS, APC, F-75205 Paris 13, France

[8] Heidelberg Univ, Landessternwarte Konigstuhl, D-69117 Heidelberg, Germany

[9] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

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

[11] CE Saclay, CEA, DSM, IRFU, F-91191 Gif Sur Yvette, France

[12] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[13] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa

[14] Univ Grenoble 1, CNRS, INSU, Astrophys Lab, F-38041 Grenoble 9, France

[15] Univ Paris 07, Univ Paris 06, CNRS, LPNHE,IN2P3, F-75252 Paris 5, France

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

[17] CNRS, Lab Annecy Le Vieux Phys Particules, IN2P3, F-74941 Annecy Le Vieux, France

[18] Univ Namibia, Windhoek, Namibia

[19] Inst Fizyki Jadrowej PAN, PL-31342 Krakow, Poland

[20] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor Astroparticules,CC 70, F-34095 Montpellier 5, France

[21] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[22] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[23] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany

[24] Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland

[25] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague, Czech Republic

[26] Uniwersytet Jagiellonski, Obserwatorium Astron, Krakow, Poland

[27] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia

[28] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, D-44780 Bochum, Germany

[29] Univ Utrecht, Astron Inst, NL-3508 TA Utrecht, Netherlands

[30] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 695卷 / 01期

基金：

新加坡国家研究基金会; 英国科学技术设施理事会;

关键词：

galaxies: active; galaxies: individual (Cen A); gamma rays: observations; COSMIC-RAYS; CHANDRA OBSERVATIONS; TEV EMISSION; M87; RADIATION; MODEL; JETS;

D O I：

10.1088/0004-637X/695/1/L40

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of faint very high energy (VHE; E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging atmospheric Cherenkov telescope array consisting of four telescopes located in Namibia. Centaurus A has been observed for more than 120 hr. A signal with a statistical significance of 5.0 sigma is detected from the region including the radio core and the inner kpc jets. The integral flux above an energy threshold of similar to 250 GeV is measured to be 0.8% of the flux of the Crab Nebula (apparent luminosity: L(> 250 GeV) approximate to 2.6 x 1039 erg s(-1), adopting a distance of 3.8 Mpc). The spectrum can be described by a power law with a photon index of 2.7 +/- 0.5(stat) +/- 0.2(sys). No significant flux variability is detected in the data set. However, the low flux only allows detection of variability on the timescale of days to flux increments above a factor of similar to 15-20 (3 sigma and 4 sigma, respectively). The discovery of VHE gamma-ray emission from Centaurus A reveals particle acceleration in the source to > TeV energies and, together with M 87, establishes radio galaxies as a class of VHE emitters.

引用

页码：L40 / L44

页数：5

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