Confronting GRB prompt emission with a model for subphotospheric dissipation

被引:41
作者
Ahlgren, Bjorn [1 ,2 ]
Larsson, Josefin [1 ,2 ]
Nymark, Tanja [1 ,2 ]
Ryde, Felix [1 ,2 ]
Pe'er, Asaf [3 ]
机构
[1] KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
[2] AlbaNova, Oscar Klein Ctr, SE-10691 Stockholm, Sweden
[3] Natl Univ Ireland Univ Coll Cork, Dept Phys, Cork, Ireland
关键词
radiation mechanisms: thermal; gamma-ray burst: general; gamma-ray burst: individual: GRB 090618; gamma-ray burst: individual: GRB 100724B; GAMMA-RAY-BURSTS; PHOTOSPHERIC EMISSION; NONTHERMAL EMISSION; THERMAL EMISSION; SPECTRA; FERMI; OUTFLOWS; CATALOG; GRB090902B; SIGNATURES;
D O I
10.1093/mnrasl/slv114
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The origin of the prompt emission in gamma-ray bursts (GRBs) is still an unsolved problem and several different mechanisms have been suggested. Here, we fit Fermi GRB data with a photospheric emission model which includes dissipation of the jet kinetic energy below the photosphere. The resulting spectra are dominated by Comptonization and contain no significant contribution from synchrotron radiation. In order to fit to the data, we span a physically motivated part of the model's parameter space and create DREAM (Dissipation with Radiative Emission as A table Model), a table model for XSPEC. We show that this model can describe different kinds of GRB spectra, including GRB 090618, representing a typical Band function spectrum, and GRB 100724B, illustrating a double peaked spectrum, previously fitted with a Band+blackbody model, suggesting they originate from a similar scenario. We suggest that the main difference between these two types of bursts is the optical depth at the dissipation site.
引用
收藏
页码:L31 / L35
页数:5
相关论文
共 36 条
[1]   THE FIRST FERMI-LAT GAMMA-RAY BURST CATALOG [J].
Ackermann, M. ;
Ajello, M. ;
Asano, K. ;
Axelsson, M. ;
Baldini, L. ;
Ballet, J. ;
Barbiellini, G. ;
Bastieri, D. ;
Bechtol, K. ;
Bellazzini, R. ;
Bhat, P. N. ;
Bissaldi, E. ;
Bloom, E. D. ;
Bonamente, E. ;
Bonnell, J. ;
Bouvier, A. ;
Brandt, T. J. ;
Bregeon, J. ;
Brigida, M. ;
Bruel, P. ;
Buehler, R. ;
Burgess, J. Michael ;
Buson, S. ;
Byrne, D. ;
Caliandro, G. A. ;
Cameron, R. A. ;
Caraveo, P. A. ;
Cecchi, C. ;
Charles, E. ;
Chaves, R. C. G. ;
Chekhtman, A. ;
Chiang, J. ;
Chiaro, G. ;
Ciprini, S. ;
Claus, R. ;
Cohen-Tanugi, J. ;
Connaughton, V. ;
Conrad, J. ;
Cutini, S. ;
D'Ammando, F. ;
de Angelis, A. ;
de Palma, F. ;
Dermer, C. D. ;
Desiante, R. ;
Digel, S. W. ;
Dingus, B. L. ;
Di Venere, L. ;
Drell, P. S. ;
Drlica-Wagner, A. ;
Dubois, R. .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2013, 209 (01)
[2]   Intrinsic spectra and energetics of BeppoSAX Gamma-Ray Bursts with known redshifts [J].
Amati, L ;
Frontera, F ;
Tavani, M ;
in't Zand, JJM ;
Antonelli, A ;
Costa, E ;
Feroci, M ;
Guidorzi, C ;
Heise, J ;
Masetti, N ;
Montanari, E ;
Nicastro, L ;
Palazzi, E ;
Pian, E ;
Piro, L ;
Soffitta, P .
ASTRONOMY & ASTROPHYSICS, 2002, 390 (01) :81-89
[3]   GRB110721A: AN EXTREME PEAK ENERGY AND SIGNATURES OF THE PHOTOSPHERE [J].
Axelsson, M. ;
Baldini, L. ;
Barbiellini, G. ;
Baring, M. G. ;
Bellazzini, R. ;
Bregeon, J. ;
Brigida, M. ;
Bruel, P. ;
Buehler, R. ;
Caliandro, G. A. ;
Cameron, R. A. ;
Caraveo, P. A. ;
Cecchi, C. ;
Chaves, R. C. G. ;
Chekhtman, A. ;
Chiang, J. ;
Claus, R. ;
Conrad, J. ;
Cutini, S. ;
D'Ammando, F. ;
de Palma, F. ;
Dermer, C. D. ;
do Couto e Silva, E. ;
Drell, P. S. ;
Favuzzi, C. ;
Fegan, S. J. ;
Ferrara, E. C. ;
Focke, W. B. ;
Fukazawa, Y. ;
Fusco, P. ;
Gargano, F. ;
Gasparrini, D. ;
Gehrels, N. ;
Germani, S. ;
Giglietto, N. ;
Giroletti, M. ;
Godfrey, G. ;
Guiriec, S. ;
Hadasch, D. ;
Hanabata, Y. ;
Hayashida, M. ;
Hou, X. ;
Iyyani, S. ;
Jackson, M. S. ;
Kocevski, D. ;
Kuss, M. ;
Larsson, J. ;
Larsson, S. ;
Longo, F. ;
Loparco, F. .
ASTROPHYSICAL JOURNAL LETTERS, 2012, 757 (02)
[4]   The width of gamma-ray burst spectra [J].
Axelsson, Magnus ;
Borgonovo, Luis .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 447 (04) :3150-3154
[5]   BATSE OBSERVATIONS OF GAMMA-RAY BURST SPECTRA .1. SPECTRAL DIVERSITY [J].
BAND, D ;
MATTESON, J ;
FORD, L ;
SCHAEFER, B ;
PALMER, D ;
TEEGARDEN, B ;
CLINE, T ;
BRIGGS, M ;
PACIESAS, W ;
PENDLETON, G ;
FISHMAN, G ;
KOUVELIOTOU, C ;
MEEGAN, C ;
WILSON, R ;
LESTRADE, P .
ASTROPHYSICAL JOURNAL, 1993, 413 (01) :281-292
[6]   RADIATIVE TRANSFER IN ULTRARELATIVISTIC OUTFLOWS [J].
Beloborodov, Andrei M. .
ASTROPHYSICAL JOURNAL, 2011, 737 (02)
[7]   Collisional mechanism for gamma-ray burst emission [J].
Beloborodov, Andrei M. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 407 (02) :1033-1047
[8]   AN OBSERVED CORRELATION BETWEEN THERMAL AND NON-THERMAL EMISSION IN GAMMA-RAY BURSTS [J].
Burgess, J. Michael ;
Preece, Robert D. ;
Ryde, Felix ;
Veres, Peter ;
Meszaros, Peter ;
Connaughton, Valerie ;
Briggs, Michael ;
Pe'er, Asaf ;
Iyyani, Shabnam ;
Goldstein, Adam ;
Axelsson, Magnus ;
Baring, Matthew G. ;
Bhat, P. N. ;
Byrne, David ;
Fitzpatrick, Gerard ;
Foley, Suzanne ;
Kocevski, Daniel ;
Omodei, Nicola ;
Paciesas, William S. ;
Pelassa, Veronique ;
Kouveliotou, Chryssa ;
Xiong, Shaolin ;
Yu, Hoi-Fung ;
Zhang, Binbin ;
Zhu, Sylvia .
ASTROPHYSICAL JOURNAL LETTERS, 2014, 784 (02)
[9]  
Cenko S. B., 2009, GRB Coordinates Network, V9518, P1
[10]   GAMMA-RAY BURST SPECTRA AND SPECTRAL CORRELATIONS FROM SUB-PHOTOSPHERIC COMPTONIZATION [J].
Chhotray, Atul ;
Lazzati, Davide .
ASTROPHYSICAL JOURNAL, 2015, 802 (02)