| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
|
|
タイトル |
Spectral Evolutions in Gamma-Ray Burst Exponential Decays Observed with Suzaku WAM |
|
言語 |
en |
| 作成者 |
Tashiro, Makoto S.
Onda, Kaori
Yamaoka, Kazutaka
Ohno, Masahiro
Sugita, Satoshi
Uehara, Takeshi
Seta, Hiromi
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
権利情報 |
(c) 2012. Astronomical Society of Japan. |
| 権利情報 |
|
|
権利情報 |
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
gamma rays: burst |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
gamma rays: observation |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
radiation mechanisms: thermal |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
blackbody radiation; non-thermal |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
inverse Compton scattering |
| 主題 |
|
|
主題Scheme |
NDC |
|
主題 |
440 |
| 内容記述 |
|
|
内容記述 |
This paper presents a study on the spectral evolution of gamma-ray burst (GRB) prompt emissions observed with the Suzaku Wide-band All-sky Monitor (WAM). By making use of the WAM data archive, 6 bright GRBs exhibiting 7 well-separated fast-rise-exponential-decay (FRED) shaped light curves are presented, and the evaluated exponential decay time constants of the energy-resolved light curves from these FRED peak light curves are shown to indicate significant spectral evolution. The energy dependence of the time constants is well described with a power-law function, τ(E) ∝Eγ, where γ∼−(0.34±0.12) on average, although 5 FRED peaks show a consistent value of γ=−1/2, which is expected in synchrotron or inverse-Compton cooling models. In particular, 2 of the GRBs were located with accuracy sufficient to evaluate the time-resolved spectra with precise energy response matrices. Their behavior in spectral evolution suggests two different origins of emissions. In the case of GRB 081224, the derived 1-s time-resolved spectra are well described by a blackbody radiation model with a power-law component. The derived behavior of cooling is consistent with that expected from radiative cooling or expansion of the emission region. On the other hand, the other 1-s time-resolved spectra from GRB 100707A is well described by a Band GRB model as well as with the thermal model. Although relative poor statistics prevent us to conclude, the energy dependence in the decaying light curve is consistent with that expected in the former emission mechanism model. |
|
言語 |
en |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Part of this work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Scientific Research No. 22340039. |
| 出版者 |
|
|
出版者 |
Astronomical Society of Japan |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
AO |
|
出版タイプResource |
http://purl.org/coar/version/c_b1a7d7d4d402bcce |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1093/pasj/64.2.26 |
| 関連情報 |
|
|
|
識別子タイプ |
arXiv |
|
|
関連識別子 |
arXiv:1110.4246v1 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0004-6264 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA1082896X |
| 開始ページ |
|
|
開始ページ |
26-1 |
| 書誌情報 |
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan
巻 64,
号 2,
p. 26-1-26-10,
発行日 2012-04-25
|
| 旧ID |
46883 |
PASJ_64_2_26.pdf (283.0 KB)
