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arXiv 0710.2114astro-ph
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SGRs和AXP的出生率:磁场的延迟放大

Birth rates of SGRs and AXPs: delayed amplification of magnetic field

Denis Leahy, Rachid Ouyed

摘要:

我们提出了新的测定AXP和SGRS的出生率及其相关的SNR。我们发现AXP/SGR的高出生率为1/(500岁),相关SNRs的高出生率为1/(1700岁)。这些高速率表明,所有的大质量恒星(大于~ 25 M_sun)都会产生具有类磁星场的遗迹。最近的观测表明,化石场不能解释祖星中如此高的场。中子星诞生期间的发电机机制需要比观测或理论表明的更快的自旋速率。在这里,我们提出了中子星的形式与正常(~ 10^{12} G)磁场,然后放大到10^{14}-10 15} G后,延迟几百年。这种放大被推测是色铁磁性的结果,发生在中子星核心达到夸克解除禁闭密度之后。这种延迟放大的现象,使得同时解释AXP/SGR的高出生率和高磁场,以及它们与大质量恒星的联系,变得困难重重。

英文摘要:

We present new determination of the birth rate of AXPs and SGRS and their associated SNRs. We find a high birth rate of 1/(500 yr) for AXPs/SGRs and 1/(1700 yr) for associated SNRs. These high rates suggest that all massive stars (greater than ~ 25 M_sun) give rise to remnants with magnetar-like fields. Recent observations indicate that fossil fields cannot explain such high fields in the progenitor stars. Dynamo mechanisms during the birth of the neutron stars require spin rates much faster than either observations or theory indicate. Here, we propose the neutron stars form with normal (~ 10^{12} G) magnetic fields, which are then amplified to 10^{14}-10^{15} G after a delay of a few hundred years. The amplification is speculated to be a consequence of color ferromagnetism and occurs after the neutron star core reaches quark-deconfinement density. This delayed amplification alleviates many difficulties in interpreting simultaneously the high birth rate and high magnetic fields of AXPs/SGRs and their link to massive stars.

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