Gamma-ray blazar spectra with HESS II mono analysis: The case of PKS2155-304 and PG1553+113

被引：27

作者：

Abdalla, H. ^{[1
]}

Abramowski, A. ^{[2
]}

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

Benkhali, F. Ait ^{[3
]}

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

Andersson, T. ^{[10
]}

Anguener, E. O. ^{[7
]}

Arrieta, M. ^{[15
]}

Aubert, P. ^{[23
]}

Backes, M. ^{[8
]}

Balzer, A. ^{[9
]}

Barnard, M. ^{[1
]}

Becherini, Y. ^{[10
]}

Tjus, J. Becker ^{[11
]}

Berge, D. ^{[12
]}

Bernhard, S. ^{[13
]}

Bernloehr, K. ^{[3
]}

Blackwell, R. ^{[14
]}

Bottcher, M. ^{[1
]}

Boisson, C. ^{[15
]}

Bolmont, J. ^{[16
]}

Bordas, P. ^{[3
]}

Brun, F. ^{[25
]}

Brun, P. ^{[17
]}

Bryan, M. ^{[9
]}

Bulik, T. ^{[18
]}

Capasso, M. ^{[27
]}

Carr, J. ^{[19
]}

Casanova, S. ^{[3
,20
]}

Cerruti, M. ^{[16
]}

Chakraborty, N. ^{[3
]}

Chalme-Calvet, R. ^{[16
]}

Chaves, R. C. G. ^{[21
]}

Chen, A. ^{[22
]}

Chevalier, J. ^{[23
]}

Chretien, M. ^{[16
]}

Colafrancesco, S. ^{[22
]}

Cologna, G. ^{[24
]}

Condon, B. ^{[25
]}

Conrad, J. ^{[26
]}

Couturier, C. ^{[16
]}

Cui, Y. ^{[27
]}

Davids, I. D. ^{[1
,8
,26
]}

Degrange, B. ^{[28
]}

Deil, C. ^{[3
]}

Devin, J. ^{[17
]}

dewilt, P. ^{[14
]}

Dirson, L. ^{[2
]}

Djannati-Atai, A. ^{[29
]}

Domainko, W. ^{[3
]}

机构：

[1] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa

[2] Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany

[3] Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany

[4] Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland

[5] Natl Acad Sci Republ Armenia, Marshall Baghramian Ave 24, Yerevan 0019, Armenia

[6] Yerevan Phys Inst, 2 Alikhanian Bros St, Yerevan 375036, Armenia

[7] Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany

[8] Univ Namibia, Dept Phys, 13301 Private Bag, Windhoek, Namibia

[9] Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[10] Linnaeus Univ, Dept Phys & Elect Engn, S-35195 Vaexjoe, Sweden

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

[12] Univ Amsterdam, Inst High Energy Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

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

[14] Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia

[15] Univ Paris Diderot, PSL Res Univ, CNRS, Observ Paris,LUTH, 5 Pl Jules Janssen, F-92190 Meudon, France

[16] UPMC Univ Paris 06, CNRS, LPNHE, Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France

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

[18] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[19] Aix Marseille Univ, CNRS, IN2P3, CPPM,UMR 7346, F-13288 Marseille, France

[20] Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland

[21] Univ Montpellier, CNRS, IN2P3, Lab Univ & Particules Montpellier, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France

[22] Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa

[23] Univ Savoie Mont Blanc, CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France

[24] Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany

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

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

[27] Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany

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

[29] Univ Paris Diderot, CNRS, IN2P3,Sorbonne Paris Cite, CEA,Observ Paris,APC,AstroParticule & Cosmol,Irfu, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France

[30] Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France

[31] CNRS, IPAG, F-38000 Grenoble, France

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

[33] Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland

[34] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany

[35] Friedrich Alexander Univ Erlangen Ntirnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany

[36] DESY, D-15738 Zeuthen, Germany

[37] Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland

[38] Nicholas Copernicus Univ, Ctr Astron, Fac Phys Astron & Informat, Grudziadzka 5, PL-87100 Torun, Poland

[39] Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa

[40] ITA Univ Heidelberg, DFG, D-69029 Heidelberg, Germany

[41] Univ Amsterdam, Inst High Energy Phys, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[42] Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

[43] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[44] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[45] Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

[46] Univ Pisa, I-56127 Pisa, Italy

[47] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[48] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA

[49] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[50] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 600卷

基金：

瑞典研究理事会; 英国科学技术设施理事会; 美国国家航空航天局; 新加坡国家研究基金会; 奥地利科学基金会; 澳大利亚研究理事会;

关键词：

galaxies: active; BL Lacertae objects: individual: PKS 2155-304; BL Lacertae objects: individual: PG 1553+113; gamma rays: galaxies; PKS; 2155-304; PG 1553+113; CRAB-NEBULA; PARTICLE-ACCELERATION; ENERGY; FERMI; EMISSION; VARIABILITY; PG-1553+113; ENVIRONMENT;

D O I：

10.1051/0004-6361/201629427

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment's sensitivity to lower energies. The lowest energy threshold is obtained using monoscopic analysis of data taken with CT5, providing access to gamma-ray energies below 100 GeV for small zenith angle observations. Such an extension of the instrument's energy range is particularly beneficial for studies of active galactic nuclei with soft spectra, as expected for those at a redshift >= 0.5. The high-frequency peaked BL Lac objects PKS 2155-304 (z = 0.116) and PG 1553 + 113 (0.43 < z < 0.58) are among the brightest objects in the gamma-ray sky, both showing clear signatures of gamma-ray absorption at E > 100 GeV interpreted as being due to interactions with the extragalactic background light (EBL). Aims. The aims of this work are twofold: to demonstrate the monoscopic analysis of CT5 data with a low energy threshold, and to obtain accurate measurements of the spectral energy distributions (SED) of PKS 2155-304 and PG 1553 + 113 near their SED peaks at energies approximate to 100 GeV. Methods. Multiple observational campaigns of PKS 2155 304 and PG 1553 + 113 were conducted during 2013 and 2014 using the full H.E.S.S. II instrument (CT1-5). A monoscopic analysis of the data taken with the new CT5 telescope was developed along with an investigation into the systematic uncertainties on the spectral parameters which are derived from this analysis. Results. Using the data from CT5, the energy spectra of PKS 2155 304 and PG 1553 + 113 were reconstructed down to conservative threshold energies of 80 GeV for PKS 2155 304, which transits near zenith, and 110 GeV for the more northern PG 1553 + 113. The measured spectra, well fitted in both cases by a log-parabola spectral model ( with a 5.0 similar to statistical preference for non-zero curvature for PKS 2155 304 and 4.5 sigma for PG 1553+113), were found consistent with spectra derived from contemporaneous Fermi-LAT data, indicating a sharp break in the observed spectra of both sources at E approximate to 100 GeV. When corrected for EBL absorption, the intrinsic H.E.S.S. II mono and Fermi-LAT spectrum of PKS 2155 304 was found to show significant curvature. For PG 1553+113, however, no significant detection of curvature in the intrinsic spectrum could be found within statistical and systematic uncertainties.

引用

页数：13

共 55 条

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de Palma, F.
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共 55 条

[1] FERMI OBSERVATIONS OF THE VERY HARD GAMMA-RAY BLAZAR PG 1553+113
Abdo, A. A.
Ackermann, M.
Ajello, M.
Atwood, W. B.
Axelsson, M.
Baldini, L.
Ballet, J.
Barbiellini, G.
Bastieri, D.
Bechtol, K.
Bellazzini, R.
Berenji, B.
Bloom, E. D.
Bonamente, E.
Borgland, A. W.
Bregeon, J.
Brez, A.
Brigida, M.
Bruel, P.
Burnett, T. H.
Caliandro, G. A.
Cameron, R. A.
Caraveo, P. A.
Casandjian, J. M.
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