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A radio pulsar with an 8.5-second period that challenges emission models

机译:周期为8.5秒的无线电脉冲星挑战发射模型

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摘要

Radio pulsars are rotating neutron stars that emit beams of radio waves from regions above their magnetic poles. Popular theories of the emission mechanism require continuous electron-positron pair production, with the potential responsible for accelerating the particles being inversely related to the spin period. Pair production will stop when the potential drops below a threshold, so the models predict that radio emission will cease when the period exceeds a value that depends on the magnetic field strength and configuration. Here we show that the pulsar J2144-3933, previously thought to have a period of 2.84 s, actually has a period of 8.51 s, which is by far the longest of any known radio pulsar. Moreover, under the usual model assumptions, based on the neutron-star equations of state, this slowly rotating pulsar should not be emitting a radio beam. Therefore either the model assumptions are wrong, or current theories of radio emission must be revised.
机译:无线电脉冲星是旋转的中子星,它们从磁极上方的区域发出无线电波。流行的发射机理理论要求连续产生电子-正电子对,负责加速粒子的电势与自旋周期成反比。当电势下降到阈值以下时,偶对产生将停止,因此模型预测,当周期超过取决于磁场强度和配置的值时,无线电发射将停止。在这里,我们显示脉冲星J2144-3933以前被认为具有2.84 s的周期,实际上具有8.51 s的周期,这是迄今为止所有已知的无线电脉冲星中最长的。而且,在通常的模型假设下,基于中子星状态方程,这种缓慢旋转的脉冲星不应发射无线电束。因此,要么模型假设错误,要么必须修改当前的无线电发射理论。

著录项

  • 来源
    《Nature》 |1999年第6747期|p.848-849|共2页
  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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