期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 505, 期 3, 页码 4086-4105出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1573
关键词
shock waves; gamma-ray burst: general; gamma-ray burst: individual: GRB 140102A; methods: observational
资金
- Department of Science and Technology (DST), India [DST/IMRCD/BRICS/PilotCall1/ProFCheap/2017(G)]
- Council of Scientific & Industrial Research (CSIR), India
- RFBR [19-02-00311A]
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
- DOE [DE-AC02-76SF00515]
- [AYA2012-39727-C03-01]
A detailed analysis of multiwavelength observations of GRB 140102A with a reverse shock signature has been presented, showing changes in the peak energy and characteristics of the host galaxy. The study provides insights into the properties of the shocks, Lorentz factor, magnetization parameters, and ambient density of the GRB, indicating a moderately magnetized baryonic dominant jet composition.
We present and perform a detailed analysis of multiwavelength observations of GRB 140102A, an optical bright GRB with an observed reverse shock (RS) signature. Observations of this GRB were acquired with the BOOTES-4 robotic telescope, the Fermi, and the Swift missions. Time-resolved spectroscopy of the prompt emission shows that changes to the peak energy (E-p) tracks intensity and the low-energy spectral index seems to follow the intensity for the first episode, whereas this tracking behaviour is less clear during the second episode. The fit to the afterglow light curves shows that the early optical afterglow can be described with RS emission and is consistent with the thin shell scenario of the constant ambient medium. The late time afterglow decay is also consistent with the prediction of the external forward shock model. We determine the properties of the shocks, Lorentz factor, magnetization parameters, and ambient density of GRB 140102A, and compare these parameters with another 12 GRBs, consistent with having RS produced by thin shells in an interstellar medium like medium. The value of the magnetization parameter (R-B approximate to 18) indicates a moderately magnetized baryonic dominant jet composition for GRB 140102A. We also report the host galaxy photometric observations of GRB 140102A obtained with 10.4m GTC, 3.5 m Calar Alto Astronomical Observatory, and 3.6m Devasthal optical telescope and find the host (photo z = 2.8(-0.9)(+0.7)) to be a high-mass, star-forming galaxy with a star formation rate of 20 +/- 10 M(circle dot)yr(-1).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据