首页> 外文期刊>The Astrophysical journal >Asymmetric Supernovae, Pulsars, Magnetars, and Gamma-Ray Bursts
【24h】

Asymmetric Supernovae, Pulsars, Magnetars, and Gamma-Ray Bursts

机译:不对称超新星,脉冲星,磁星和伽马射线爆发

获取原文
       

摘要

We outline the possible physical processes, associated timescales, and energetics that could lead to the production of pulsars, jets, asymmetric supernovae, and weak γ-ray bursts in routine circumstances and to a 1016 G magnetar and perhaps stronger γ-ray burst in more extreme circumstances in the collapse of the bare core of a massive star. The production of a LeBlanc-Wilson MHD jet could provide an asymmetric supernova and result in a weak γ-ray burst when the jet accelerates down the stellar density gradient of a hydrogen-poor photosphere. The matter-dominated jet would be formed promptly but requires 5-10 s to reach the surface of the progenitor of a Type Ib/c supernova. During this time, the newly born neutron star could contract, spin up, and wind up field lines or turn on an α-Ω dynamo. In addition, the light cylinder will contract from a radius large compared to the Alfvén radius to a size comparable to that of the neutron star. This will disrupt the structure of any organized dipole field and promote the generation of ultrarelativistic MHD waves (UMHDW) at high density and large-amplitude electromagnetic waves (LAEMW) at low density. The generation of these waves would be delayed by the cooling time of the neutron star 5-10 s, but the propagation time is short so the UMHDW could arrive at the surface at about the same time as the matter jet. In the density gradient of the star and the matter jet, the intense flux of UMHDW and LAEMW could drive shocks, generate pions by proton-proton collision, or create electron/positron pairs depending on the circumstances. The UMHDW and LAEMW could influence the dynamics of the explosion and might also tend to flow out the rotation axis to produce a collimated γ-ray burst.
机译:我们概述了可能的物理过程,相关的时间尺度和高能学,它们可能导致在常规情况下产生脉冲星,射流,不对称超新星和弱γ射线爆发,并在更多情况下导致1016 G磁场和更强的γ射线爆发。极端情况下,一颗巨大恒星裸核的崩溃。 LeBlanc-Wilson MHD射流的产生可能会提供不对称的超新星,并且当该射流沿贫氢光球的恒星密度梯度加速时,会导致弱的γ射线爆发。物质主导的射流将迅速形成,但需要5-10秒钟的时间才能到达Ib / c型超新星的祖先表面。在这段时间中,新生的中子星可能会收缩,旋转并缠绕磁力线或打开α-Ω发电机。此外,光柱将从比Alfvén半径大的半径收缩到与中子星可比的大小。这将破坏任何有组织的偶极子场的结构,并促进高密度的超相对论MHD波(UMHDW)和低密度的大振幅电磁波(LAEMW)的产生。这些波的产生将被中子星的冷却时间5-10 s延迟,但是传播时间很短,因此UMHDW可以与物质射流几乎同时到达表面。在恒星和物质射流的密度梯度中,视情况而定,UMHDW和LAEMW的强通量可能会引发冲击,通过质子-质子碰撞产生离子或生成电子/正电子对。 UMHDW和LAEMW可能会影响爆炸的动力学,并且还可能倾向于流出旋转轴以产生准直的γ射线猝发。

著录项

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