HESS discovery of VHE γ-rays from the quasar PKS 1510-089

被引：68

作者：

Abramowski, A. ^{[1
]}

Acero, F. ^{[2
]}

Aharonian, F. ^{[3
,4
,5
]}

Akhperjanian, A. G. ^{[5
,6
]}

Anton, G. ^{[7
]}

Balenderan, S. ^{[8
]}

Balzer, A. ^{[9
,10
]}

Barnacka, A. ^{[11
,12
]}

Becherini, Y. ^{[13
,14
]}

Tjus, J. Becker ^{[15
]}

Behera, B. ^{[23
]}

Bernloehr, K. ^{[3
,16
]}

Birsin, E. ^{[16
]}

Biteau, J. ^{[14
]}

Bochow, A. ^{[3
]}

Boisson, C. ^{[17
]}

Bolmont, J. ^{[18
]}

Bordas, P. ^{[19
]}

Brucker, J. ^{[7
]}

Brun, F. ^{[14
]}

Brun, P. ^{[12
]}

Bulik, T. ^{[20
]}

Carrigan, S. ^{[3
]}

Casanova, S. ^{[3
,21
]}

Cerruti, M. ^{[17
]}

Chadwick, P. M. ^{[8
]}

Chaves, R. C. G. ^{[3
,12
]}

Cheesebrough, A. ^{[8
]}

Colafrancesco, S. ^{[22
]}

Cologna, G. ^{[23
]}

Conrad, J. ^{[24
]}

Couturier, C. ^{[18
]}

Dalton, M. ^{[16
,25
]}

Daniel, M. K. ^{[8
]}

Davids, I. D. ^{[26
]}

Degrange, B. ^{[14
]}

Deil, C. ^{[3
]}

deWilt, P. ^{[27
]}

Dickinson, H. J. ^{[24
]}

Djannati-Atai, A. ^{[13
]}

Domainko, W. ^{[3
]}

Drury, L. O'C. ^{[4
]}

Dubus, G. ^{[28
]}

Dutson, K. ^{[29
]}

Dyks, J. ^{[11
]}

Dyrda, M. ^{[30
]}

Egberts, K. ^{[31
]}

Eger, P. ^{[7
]}

Espigat, P. ^{[13
]}

Fallon, L. ^{[4
]}

机构：

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

[2] Univ Montpellier 2, CNRS IN2P3, Lab Univers & Particules Montpellier, CC 72, F-34095 Montpellier 5, France

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

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

[5] Natl Acad Sci Republ Armenia, Yerevan, Armenia

[6] Yerevan Phys Inst, Yerevan 375036, Armenia

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

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

[9] DESY, D-15735 Zeuthen, Germany

[10] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

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

[12] CEA Saclay, DSM Irfu, F-91191 Gif Sur Yvette, France

[13] Univ Paris Diderot, CNRS IN2P3, CEA Irfu, Observ Paris,Sorbonne Paris Cite, F-75205 Paris 13, France

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

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

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

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

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

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

[20] Univ Warsaw, Astron Observ, D-52425 Warsaw, Poland

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

[22] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

[23] Heidelberg Univ, D-69117 Heidelberg, Germany

[24] Stockholm Univ, Oskar Klein Ctr, Dept Phys, Albanova Univ Ctr, S-10691 Stockholm, Sweden

[25] Univ Bordeaux 1, CNRS IN2P3, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France

[26] Univ Namibia, Dept Phys, Windhoek, Namibia

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

[28] UJF Grenoble 1, CNRS INSU, IPAG UMR 5274, F-38041 Grenoble, France

[29] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[30] Instytut Fizyki Jadrowej PAN, Krakow, Poland

[31] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

[32] Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, PL-30244 Krakow, Poland

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

[34] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic

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

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 554卷

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：

gamma rays: galaxies; quasars: individual: PKS 1510-089; infrared: diffuse background; LARGE-AREA TELESCOPE; EXTRAGALACTIC BACKGROUND LIGHT; ACTIVE GALACTIC NUCLEI; HIGH-ENERGY PHOTONS; MULTIWAVELENGTH OBSERVATIONS; POLARIZATION PROPERTIES; SOURCE CATALOG; RADIO-SOURCES; BLAZARS; ABSORPTION;

D O I：

10.1051/0004-6361/201321135

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The quasar PKS 1510-089 (z = 0.361) was observed with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes during high states in the optical and GeV bands, to search for very high energy (VHE, defined as E >= 0.1 TeV) emission. VHE gamma-rays were detected with a statistical significance of 9.2 standard deviations in 15.8 h of H. E. S. S. data taken during March and April 2009. A VHE integral flux of I(0.15 TeV < E < 1.0TeV) = (1.0 +/- 0.2(stat) +/- 0.2(sys)) x 10(-11) cm(-2) s(-1) is measured. The best-fit power law to the VHE data has a photon index of G = 5.4 +/- 0.7(stat) +/- 0.3(sys). The GeV and optical light curves show pronounced variability during the period of H.E.S.S. observations. However, there is insufficient evidence to claim statistically significant variability in the VHE data. Because of its relatively high redshift, the VHE flux from PKS 1510-089 should suffer considerable attenuation in the intergalactic space due to the extragalactic background light (EBL). Hence, the measured gamma-ray spectrum is used to derive upper limits on the opacity due to EBL, which are found to be comparable with the previously derived limits from relatively-nearby BL Lac objects. Unlike typical VHE-detected blazars where the broadband spectrum is dominated by nonthermal radiation at all wavelengths, the quasar PKS 1510-089 has a bright thermal component in the optical to UV frequency band. Among all VHE detected blazars, PKS 1510-089 has the most luminous broad line region. The detection of VHE emission from this quasar indicates a low level of gamma - gamma absorption on the internal optical to UV photon field.

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页数：7

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