Anomalous X-Ray Pulsars and Soft Gamma-Ray Repeaters in Supernova Remnants
Anomalous X-Ray Pulsars and Soft Gamma-Ray Repeaters in Supernova Remnants
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DOI：
10.1086/322358
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发表时间：
2001-04
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通讯作者：
B. Gaensler;P. Slane;E. Gotthelf;G. V. Mit;CfA;Columbia;JPLCaltech
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作者：
B. Gaensler;P. Slane;E. Gotthelf;G. V. Mit;CfA;Columbia;JPLCaltech
异常x射线脉冲星（axp）和软伽玛射线中继器（sgr）的特性可以通过它们与超新星遗迹（SNRs）的关联来提供重要的约束。我们已经对axp RX J170849-400910和4U 0142+61进行了无线电搜索。我们发现前者位于一个可能的新信噪比附近，它不太可能与物理相关，但我们在后者附近没有看到信噪比。我们回顾了所有已声明的axp和snr之间的配对；这三个令人信服的关联表明，axp是年轻的（< 10000年）中子星，预计空间速度较低（<500 km s-1）。与之前的说法相反，我们没有发现证据表明axp周围的环境介质密度高于射电脉冲星附近的环境介质密度。此外，未检测到来自axp的无线电发射并不意味着这些源是无线电沉默的。我们还回顾了sgr和snr之间的关联。我们发现这些关联没有一个是令人信服的，符合这样一种情况，即sgr和axp都是高场中子星（“磁星”）的种群，但sgr是比axp更古老或更长寿的一组物体。如果SGR-SNR关联被证明是有效的，那么sgr必须是高速物体，并且很可能代表与axp不同的一类源。
Important constraints on the properties of the anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) can be provided by their associations with supernova remnants (SNRs). We have made a radio search for SNRs toward the AXPs RX J170849-400910 and 4U 0142+61. We find that the former lies near a possible new SNR with which it is unlikely to be physically associated, but we see no SNR in the vicinity of the latter. We review all claimed pairings between AXPs and SNRs; the three convincing associations imply that AXPs are young (<10 000 yr) neutron stars with low projected space velocities (<500 km s-1). Contrary to previous claims, we find no evidence that the density of the ambient medium around AXPs is higher than that in the vicinity of radio pulsars. Furthermore, the nondetection of radio emission from AXPs does not imply that these sources are radio-silent. We also review claimed associations between SGRs and SNRs. We find none of these associations to be convincing, consistent with a scenario in which SGRs and AXPs are both populations of high-field neutron stars ("magnetars") but the SGRs are an older or longer-lived group of objects than are the AXPs. If the SGR-SNR associations are shown to be valid, then SGRs must be high-velocity objects and most likely represent a different class of source to the AXPs.