• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >PROPERTIES OF RELATIVISTIC JETS IN GAMMA-RAY BURST AFTERGLOWS
【24h】

PROPERTIES OF RELATIVISTIC JETS IN GAMMA-RAY BURST AFTERGLOWS

机译：伽玛射线爆发后相对论射束的性质

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We extend our calculation of physical parameters of gamma-ray burst (GRB) jets by modeling the broadband emission of the afterglows 970508, 980519, 991208, 000926, 000418, and 010222. Together with 990123, 990510, 991216, and 000301c, there are 10 well-observed afterglows for which the initial opening angle of the GRB jet can be constrained. The jet energies (after the GRB phase) obtained for this set of afterglows are within one decade around 5 x 10~(50) ergs. With the exception of 000418, which requires a jet wider than 1/2 rad, the jet initial half-angle in the other cases ranges from 2° to 20°. We find that in half of the cases, a homogeneous ambient medium accommodates the afterglow emission better than the windlike r~(-2) profile medium expected around massive stars. The two types of media give fits of comparable quality in four cases, with a wind medium providing a better description only for 970508. The circumburst densities we obtain are in the 0.1-100 cm~(-3) range, with the exception of 990123, for which it is below 10~(-2) cm~(-3). If in all 10 cases the observed GRB durations are a good measure of the ejecta deceleration time-scale, then the parameters obtained here lead to jet Lorentz factors at the deceleration radius between 70 and 300, anticorrelated with the jet initial aperture, and jet masses around 10~(-6) solar mass. Our results on the jet energy, opening Lorentz factor, and evacuation of material until breakout provide constraints on theoretical models of GRB jets.
机译：我们通过对余辉970508、980519、991208、000926、000418和010222的宽带发射进行建模，扩展了对伽马射线暴（GRB）喷气机物理参数的计算。连同990123、990510、991216和000301c，还有观察到10个余辉，可以限制GRB射流的初始张角。这组余辉获得的射流能量（在GRB阶段之后）大约在5 x 10〜（50）ergs的十年内。除了000418要求射流的宽度大于1/2 rad，其他情况下，射流的初始半角范围为2°至20°。我们发现，在一半的情况下，均匀的环境介质比预期在大质量恒星周围的风状r〜（-2）剖面介质更能适应余辉发射。两种类型的介质在四种情况下的质量可比，风介质仅对970508提供更好的描述。我们获得的周向密度在0.1-100 cm〜（-3）范围内，990990除外。小于10〜（-2）cm〜（-3）。如果在所有10种情况下观察到的GRB持续时间都可以很好地衡量喷射的减速时间尺度，则此处获得的参数会导致减速半径在70到300之间的喷射洛伦兹因子，与喷射初始孔径和喷射质量反相关太阳质量约为10〜（-6）。我们关于射流能量，开放的洛伦兹因子和材料逸散直至破裂的结果为GRB射流的理论模型提供了约束。

著录项

  • 来源
    《The Astrophysical journal》 |2002年第1期|p.779-789|共11页
  • 作者

    A. PANAITESCU; P. KUMAR;

  • 作者单位

    Department of Astrophysical Sciences, Princeton University, Peyton Hall-Ivy Lane, Princeton, NJ 08544;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号