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Transient pulsed radio emission from a magnetar

机译:磁星的瞬时脉冲无线电发射

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Anomalous X-ray pulsars (AXPs) are slowly rotating neutron stars with very bright and highly variable X-ray emission that are believed to be powered by ultra-strong magnetic fields of >10(14) G, according to the 'magnetar' model(1). The radio pulsations that have been observed from more than 1,700 neutron stars with weaker magnetic fields have never been detected from any of the dozen known magnetars. The X-ray pulsar XTE J1810-197 was revealed ( in 2003) as the first AXP with transient emission when its luminosity increased 100-fold from the quiescent level(2); a coincident radio source of unknown origin was detected one year later(3). Here we show that XTE J1810-197 emits bright, narrow, highly linearly polarized radio pulses, observed at every rotation, thereby establishing that magnetars can be radio pulsars. There is no evidence of radio emission before the 2003 X-ray outburst ( unlike ordinary pulsars, which emit radio pulses all the time), and the flux varies from day to day. The flux at all radio frequencies is approximately equal - and at > 20 GHz XTE J1810-197 is currently the brightest neutron star known. These observations link magnetars to ordinary radio pulsars, rule out alternative accretion models for AXPs, and provide a new window into the coronae of magnetars.
机译:根据“磁星”模型,异常的X射线脉冲星(AXP)正在缓慢旋转的中子星具有非常明亮且高度可变的X射线辐射,据信它们由> 10(14)G的超强磁场提供动力(1)。在十几个已知的磁星中,从未发现过来自磁场强度较弱的1,700多个中子星的无线电脉冲。 X射线脉冲星XTE J1810-197于2003年被揭示为第一个具有瞬态发射的AXP,其发光度从静止水平增加了100倍(2);一年后发现了一个未知来源的重合无线电源(3)。在这里,我们显示XTE J1810-197发出明亮,狭窄,高度线性极化的无线电脉冲,在每次旋转时都可以观察到,从而确定了磁星可以是无线电脉冲星。没有证据表明在2003年X射线爆发之前有无线电发射(与普通脉冲星不同,后者总是一直发射无线电脉冲),并且通量每天都在变化。 XTE J1810-197是所有已知频率中最亮的中子星,在所有射频下的通量大致相等-并且在> 20 GHz时。这些观测将磁星与普通无线电脉冲星联系起来,排除了AXP的替代吸积模型,并提供了进入磁星日冕的新窗口。

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