MODELING THE GAMMA-RAY EMISSION IN THE GALACTIC CENTER WITH A FADING COSMIC-RAY ACCELERATOR

被引：8

作者：

Liu, Ruo-Yu ^{[1
]}

Wang, Xiang-Yu ^{[1
,2
,3
]}

Prosekin, Anton ^{[1
]}

Chang, Xiao-Chuan ^{[2
,3
]}

机构：

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

[2] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 833卷 / 02期

基金：

中国国家自然科学基金;

关键词：

cosmic rays; Galaxy: center; gamma rays: general; MASSIVE BLACK-HOLE; HIGH-ENERGY; TIDAL DISRUPTION; STARS; DISCOVERY; GALAXIES; ESCAPE;

D O I：

10.3847/1538-4357/833/2/200

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent HESS observations of the similar to 200 pc scale diffuse gamma-ray emission from the central molecular zone (CMZ) suggest the presence of a PeV cosmic-ray accelerator (PeVatron) located in the inner 10 pc region of the Galactic center. Interestingly, the gamma-ray spectrum of the point-like source (HESS J1745-290) in the Galactic center shows a cutoff at similar to 10 TeV, implying a cutoff around 100 TeV in the cosmic-ray proton spectrum. Here we propose that the gamma-ray emission from the inner and the outer regions may be explained self-consistently by run-away protons from a single yet fading accelerator. In this model, gamma-rays from the CMZ region are produced by protons injected in the past, while gamma-rays from the inner region are produced by protons injected more recently. We suggest that the blast wave formed in a tidal disruption event (TDE) caused by the supermassive black hole (Sgr A*) could serve as such a fading accelerator. With typical parameters of the TDE blast wave, gamma-ray spectra of both the CMZ region and HESS. J1745-290 can be reproduced simultaneously. Meanwhile, we find that the cosmic-ray energy density profile in the CMZ region may also be reproduced in the fading accelerator model when appropriate combinations of the particle injection history and the diffusion coefficient of cosmic rays are adopted.

引用

页数：8

共 44 条

[1] FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1) [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe. ;

Chekhtman, A. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Dermer, C. D. ;

de Palma, F. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. ;

Fegan, S. J. ;

Fukazawa, Y. ;

Fukui, Y. ;

Funk, S. ;

Fusco, P. ;

Gargano, F. ;

Gehrels, N. .

ASTROPHYSICAL JOURNAL, 2010, 718 (01) :348-356

[2] Acceleration of petaelectronvolt protons in the Galactic Centre [J].

Abramowski, A. ;

Aharonian, F. ;

Benkhali, F. Ait ;

Akhperjanian, A. G. ;

Anguener, E. O. ;

Backes, M. ;

Balzer, A. ;

Becherini, Y. ;

Tjus, J. Becker ;

Berge, D. ;

Bernhard, S. ;

Bernloehr, K. ;

Birsin, E. ;

Blackwell, R. ;

Boettcher, M. ;

Boisson, C. ;

Bolmont, J. ;

Bordas, P. ;

Bregeon, J. ;

Brun, F. ;

Brun, P. ;

Bryan, M. ;

Bulik, T. ;

Carr, J. ;

Casanova, S. ;

Chakraborty, N. ;

Chalme-Calvet, R. ;

Chaves, R. C. G. ;

Chen, A. ;

Chretien, M. ;

Colafrancesco, S. ;

Cologna, G. ;

Conrad, J. ;

Couturier, C. ;

Cui, Y. ;

Davids, I. D. ;

Degrange, B. ;

Deil, C. ;

deWilt, P. ;

Djannati-Ata, A. ;

Domainko, W. ;

Donath, A. ;

Drury, L. O'C. ;

Dubus, G. ;

Dutson, K. ;

Dyks, J. ;

Dyrda, M. ;

Edwards, T. ;

Egberts, K. ;

Eger, P. .

NATURE, 2016, 531 (7595) :476-+

[3] Detection of the Characteristic Pion-Decay Signature in Supernova Remnants [J].

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Busetto, G. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, O. ;

Charles, E. ;

Chaty, S. ;

Chaves, R. C. G. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Chiaro, G. ;

Cillis, A. N. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Corbel, S. ;

Cutini, S. ;

D'Ammando, F. ;

de Angelis, A. ;

de Palma, F. ;

Dermer, C. D. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Drlica-Wagner, A. .

SCIENCE, 2013, 339 (6121) :807-811

[4] Discovery of very high energy gamma-ray emission coincident with molecular clouds in the W 28 (G6.4-0.1) field [J].

Aharonian, F. ;

Akhperjanian, A. G. ;

Bazer-Bachi, A. R. ;

Behera, B. ;

Beilicke, M. ;

Benbow, W. ;

Berge, D. ;

Bernloehr, K. ;

Boisson, C. ;

Bolz, O. ;

Borrel, V. ;

Braun, I. ;

Brion, E. ;

Brown, A. M. ;

Buehler, R. ;

Bulik, T. ;

Buesching, I. ;

Boutelier, T. ;

Carrigan, S. ;

Chadwick, P. M. ;

Chounet, L. -M. ;

Clapson, A. C. ;

Coignet, G. ;

Cornils, R. ;

Costamante, L. ;

Degrange, B. ;

Dickinson, H. J. ;

Djannati-Atai, A. ;

Domainko, W. ;

Drury, L. O'C. ;

Dubus, G. ;

Dyks, J. ;

Egberts, K. ;

Emmanoulopoulos, D. ;

Espigat, P. ;

Farnier, C. ;

Feinstein, F. ;

Fiasson, A. ;

Foerster, A. ;

Fontaine, G. ;

Fukui, Y. ;

Funk, Seb. ;

Funk, S. ;

Fuessling, M. ;

Gallant, Y. A. ;

Giebels, B. ;

Glicenstein, J. F. ;

Glueck, B. ;

Goret, P. ;

Hadjichristidis, C. .

ASTRONOMY & ASTROPHYSICS, 2008, 481 (02) :401-U69

[5] TeV gamma rays from the galactic center direct and indirect links to the massive black hole in Sgr A* [J].

Aharonian, F ;

Neronov, A .

ASTROPHYSICS AND SPACE SCIENCE, 2005, 300 (1-3) :255-265

[6] High-energy gamma rays from the massive black hole in the Galactic center [J].

Aharonian, F ;

Neronov, A .

ASTROPHYSICAL JOURNAL, 2005, 619 (01) :306-313

[7] Spectrum and variability of the Galactic center VHE γ-ray source HESS J1745-290 [J].

Aharonian, F. ;

Akhperjanian, A. G. ;

Anton, G. ;

de Almeida, U. Barres ;

Bazer-Bachi, A. R. ;

Becherini, Y. ;

Behera, B. ;

Bernloehr, K. ;

Boisson, C. ;

Bochow, A. ;

Borrel, V. ;

Braun, I. ;

Brion, E. ;

Brucker, J. ;

Brun, P. ;

Buehler, R. ;

Bulik, T. ;

Buesching, I. ;

Boutelier, T. ;

Chadwick, P. M. ;

Charbonnier, A. ;

Chaves, R. C. G. ;

Cheesebrough, A. ;

Chounet, L. -M. ;

Clapson, A. C. ;

Coignet, G. ;

Dalton, M. ;

Daniel, M. K. ;

Davids, I. D. ;

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. ;

Fiasson, A. ;

Foerster, A. ;

Fontaine, G. ;

Fuessling, M. ;

Gabici, S. ;

Gallant, Y. A. .

ASTRONOMY & ASTROPHYSICS, 2009, 503 (03) :817-825

[8] THE PROBLEM OF SUPERLUMINAL DIFFUSION OF RELATIVISTIC PARTICLES AND ITS PHENOMENOLOGICAL SOLUTION [J].

Aloisio, R. ;

Berezinsky, V. ;

Gazizov, A. .

ASTROPHYSICAL JOURNAL, 2009, 693 (02) :1275-1282

[9] ELECTRONS AND POSITRONS IN THE GALACTIC COSMIC-RAYS [J].

ATOYAN, AM ;

AHARONIAN, FA ;

VOLK, HJ .

PHYSICAL REVIEW D, 1995, 52 (06) :3265-3275

[10] Cosmic ray origins in supernova blast waves [J].

Bell, A. R. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 447 (03) :2224-2234

← 1 2 3 4 5 →