Is Bremsstrahlung a Possible Mechanism to Explain the Thermal Feature in the GRB 130925A X-Ray Afterglow?

被引：2

作者：

Liu, Jie-Ying ^{[1
,2
,3
]}

Mao, Jirong ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China

[2] Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China

[3] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 878卷 / 02期

基金：

中国国家自然科学基金;

关键词：

gamma-ray burst: general; gamma-ray burst: individual (GRB 130925A); radiation mechanisms: thermal; BURSTS; SIGNATURES; 101225A; SEARCH;

D O I：

10.3847/1538-4357/ab21bb

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It has been reported that some X-ray spectra of gamma-ray burst (GRB) afterglows cannot be fitted by a simple power law. A blackbody component is added to precisely fit the thermal feature in these spectra. Alternatively, we propose that bremsstrahlung radiation can also be one possible mechanism to explain the thermal component of the GRB X-ray afterglow. In particular, we examine the X-ray afterglow of the ultra-long GRB 130925A in this paper. By our calculation, we find that the X-ray thermal component observed by both Swift-XRT and NuSTAR can be well explained by the bremsstrahlung radiation. Our results indicate that the GRBs with the bremsstrahlung emission in the X-ray afterglow could be born in a metal-rich and dusty environment.

引用

页数：4

共 25 条

[1] THERMAL EMISSIONS SPANNING THE PROMPT AND THE AFTERGLOW PHASES OF THE ULTRA-LONG GRB 130925A
Basak, Rupal
Rao, A. R.
[J]. ASTROPHYSICAL JOURNAL, 2015, 807 (01)
[2] ARE ULTRA-LONG GAMMA-RAY BURSTS DIFFERENT?
Boer, M.
Gendre, B.
Stratta, G.
[J]. ASTROPHYSICAL JOURNAL, 2015, 800 (01)
[3] The unusual gamma-ray burst GRB 101225A explained as a minor body falling onto a neutron star
Campana, S.
Lodato, G.
D'Avanzo, P.
Panagia, N.
Rossi, E. M.
Della Valle, M.
Tagliaferri, G.
Antonelli, L. A.
Covino, S.
Ghirlanda, G.
Ghisellini, G.
Melandri, A.
Pian, E.
Salvaterra, R.
Cusumano, G.
D'Elia, V.
Fugazza, D.
Palazzi, E.
Sbarufatti, B.
Vergani, S. D.
[J]. NATURE, 2011, 480 (7375) : 69 - 71
[4] UV star-formation rates of GRB host galaxies
Christensen, L
Hjorth, J
Gorosabel, J
[J]. ASTRONOMY & ASTROPHYSICS, 2004, 425 (03) : 913 - 926
[5] GROND coverage of the main peak of gamma-ray burst 130925A
Greiner, J.
Yu, H. -F.
Kruehler, T.
Frederiks, D. D.
Beloborodov, A.
Bhat, P. N.
Bolmer, J.
van Eerten, H.
Aptekar, R. L.
Elliott, J.
Golenetskii, S. V.
Graham, J. F.
Hurley, K.
Kann, D. A.
Klose, S.
Guelbenzu, A. Nicuesa
Rau, A.
Schady, P.
Schmidl, S.
Sudilovsky, V.
Svinkin, D. S.
Tanga, M.
Ulanov, M. V.
Varela, K.
von Kienlin, A.
Zhang, X. -L.
[J]. ASTRONOMY & ASTROPHYSICS, 2014, 568
[6] HORESH A, 2015, APJ, V812, DOI DOI 10.1088/0004-637X/812/1/86
[7] Janiuk A., 2014, A A, V568
[8] A NEW POPULATION OF ULTRA-LONG DURATION GAMMA-RAY BURSTS
Levan, A. J.
Tanvir, N. R.
Starling, R. L. C.
Wiersema, K.
Page, K. L.
Perley, D. A.
Schulze, S.
Wynn, G. A.
Chornock, R.
Hjorth, J.
Cenko, S. B.
Fruchter, A. S.
O'Brien, P. T.
Brown, G. C.
Tunnicliffe, R. L.
Malesani, D.
Jakobsson, P.
Watson, D.
Berger, E.
Bersier, D.
Cobb, B. E.
Covino, S.
Cucchiara, A.
de Ugarte Postigo, A.
Fox, D. B.
Gal-Yam, A.
Goldoni, P.
Gorosabel, J.
Kaper, L.
Kruehler, T.
Karjalainen, R.
Osborne, J. P.
Pian, E.
Sanchez-Ramirez, R.
Schmidt, B.
Skillen, I.
Tagliaferri, G.
Thoene, C.
Vaduvescu, O.
Wijers, R. A. M. J.
Zauderer, B. A.
[J]. ASTROPHYSICAL JOURNAL, 2014, 781 (01)
[9] On the light curves of GRB afterglows
Mao, JR
Wang, JC
[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS, 2001, 1 (05): : 433 - 442
[10] Viewing angle and environment effects in gamma-ray bursts: Sources of afterglow diversity
Meszaros, P
Rees, MJ
Wijers, RAMJ
[J]. ASTROPHYSICAL JOURNAL, 1998, 499 (01) : 301 - 308

← 1 2 3 →