Spectrum and variability of the Galactic center VHE γ-ray source HESS J1745-290

被引：115

作者：

Aharonian, F. ^{[1
,3
]}

Akhperjanian, A. G. ^{[2
]}

Anton, G. ^{[17
]}

de Almeida, U. Barres ^{[8
]}

Bazer-Bachi, A. R. ^{[3
]}

Becherini, Y. ^{[12
,13
]}

Behera, B. ^{[15
]}

Bernloehr, K. ^{[1
,5
]}

Boisson, C. ^{[6
]}

Bochow, A. ^{[1
]}

Borrel, V. ^{[3
]}

Braun, I. ^{[1
]}

Brion, E. ^{[7
]}

Brucker, J. ^{[17
]}

Brun, P. ^{[7
]}

Buehler, R. ^{[1
]}

Bulik, T. ^{[25
]}

Buesching, I. ^{[9
]}

Boutelier, T. ^{[18
]}

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

Charbonnier, A. ^{[20
]}

Chaves, R. C. G. ^{[1
]}

Cheesebrough, A. ^{[8
]}

Chounet, L. -M. ^{[10
]}

Clapson, A. C. ^{[1
]}

Coignet, G. ^{[11
]}

Dalton, M. ^{[5
]}

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

Davids, I. D. ^{[9
,23
]}

Degrange, B. ^{[10
]}

Deil, C. ^{[1
]}

Dickinson, H. J. ^{[8
]}

Djannati-Atai, A. ^{[12
,13
]}

Domainko, W. ^{[1
]}

Drury, L. O'C. ^{[14
]}

Dubois, F. ^{[11
]}

Dubus, G. ^{[18
]}

Dyks, J. ^{[25
]}

Dyrda, M. ^{[29
]}

Egberts, K. ^{[1
]}

Emmanoulopoulos, D. ^{[15
]}

Espigat, P. ^{[12
,13
]}

Farnier, C. ^{[16
]}

Feinstein, F. ^{[16
]}

Fiasson, A. ^{[16
]}

Foerster, A. ^{[1
]}

Fontaine, G. ^{[10
]}

Fuessling, M. ^{[5
]}

Gabici, S. ^{[14
]}

Gallant, Y. A. ^{[16
]}

机构：

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

[2] Yerevan Phys Inst, Yerevan 375036, Armenia

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

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

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

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

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

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

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

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

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

[12] Univ Paris 07, CNRS, Astroparticule & Cosmol, F-75205 Paris 13, France

[13] Univ Paris 07, UMR 7164, CNRS, Observ Paris,CEA, F-75205 Paris 13, France

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

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

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

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

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

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

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

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

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

[23] Univ Namibia, Windhoek, Namibia

[24] Uniwersytet Jagiellonski, Astron Observ, PL-30244 Krakow, Poland

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

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

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

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

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

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 503卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

Galaxy: center; gamma rays: observations; methods: data analysis; SAGITTARIUS-A-ASTERISK; SUPERMASSIVE BLACK-HOLE; LIGHT-CURVE; DIRECTION; EMISSION; TELESCOPE; ASTRONOMY; FLARES; GALAXY;

D O I：

10.1051/0004-6361/200811569

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. A detailed study of the spectrum and variability of the source HESS J1745-290 in the Galactic Center (GC) region using new data from the H. E. S. S. array of Cherenkov telescopes is presented. Flaring activity and quasi periodic oscillations (QPO) of HESS J1745-290 are investigated. Methods. The image analysis is performed with a combination of a semi-analytical shower model and the statistical moment-based Hillas technique. The spectrum and lightcurves of HESS J1745-290 are derived with a likelihood method based on a spectral shape hypothesis. Rayleigh tests and Fourier analysis of the H. E. S. S. GC signal are used to study the periodicity of the source. Results. With a three-fold increase in statistics compared to previous work, a deviation from a simple power law spectrum is detected for the first time. The measured energy spectrum over the three years 2004, 2005 and 2006 of data taking is compatible with both a power law spectrum with an exponential cut-off and a broken power law spectrum. The curvature of the energy spectrum is likely to be intrinsic to the photon source, as opposed to effects of interstellar absorption. The power law spectrum with an exponential cut-off is characterized by a photon index of 2.10 +/- 0.04(stat) +/- 0.10(syst) and a cut-off energy at 15.7 +/- 3.4(stat) +/- 2.5(syst) TeV. The broken power law spectrum exhibits spectral indices of 2.02 +/- 0.08(stat) +/- 0.10(syst) and 2.63 +/- 0.14(stat) +/- 0.10(syst) with a break energy at 2.57 +/- 0.19(stat) +/- 0.44(syst) TeV. No significant flux variation is found. Increases in the gamma-ray flux of HESS J1745-290 by at least a factor of two would be required for a 3 sigma detection of a flare with time scales of an hour. Investigation of possible QPO activity at periods claimed to be detected in X-rays does not show any periodicities in the H. E. S. S. signal.

引用

页码：817 / 825

页数：9

共 41 条

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Chadwick, PM ;

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Cornils, R ;

Costamante, L ;

Degrange, B ;

Djannati-Ataï, A ;

Drury, LO ;

Ergin, T ;

Espigat, P ;

Feinstein, F ;

Fleury, P ;

Fontaine, G ;

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Gillessen, S ;

Goret, P ;

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Hofmann, W ;

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Benbow, W. ;

Bernloehr, K. ;

Boisson, C. ;

Bochow, A. ;

Borrel, V. ;

Braun, I. ;

Brion, E. ;

Brucker, J. ;

Brun, P. ;

Buehler, R. ;

Bulik, T. ;

Buesching, I. ;

Boutelier, T. ;

Carrigan, S. ;

Chadwick, P. M. ;

Charbonnier, A. ;

Chaves, R. C. G. ;

Cheesebrough, A. ;

Chounet, L. -M. ;

Clapson, A. C. ;

Coignet, G. ;

Dalton, M. ;

Degrange, B. ;

Deil, C. ;

Dickinson, H. J. ;

Djannati-Atai, A. ;

Domainko, W. ;

Drury, L. O'C. ;

Dubois, F. ;

Dubus, G. ;

Dyks, J. ;

Dyrda, M. ;

Egberts, K. ;

Emmanoulopoulos, D. ;

Espigat, P. ;

Farnier, C. ;

Feinstein, F. ;

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