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arXiv 0912.4985astro-ph.HE
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HESS超新星遗迹中的两颗候选磁星

Two Magnetar Candidates in HESS Supernova Remnants

J. P. Halpern, E. V. Gotthelf

摘要:

我们确定了两个候选磁星在档案X射线观测HESS检测壳型信噪比。CTB 37 B中与HESS J1713-381重合的X射线点源和G353.6-0.7中与HESS J1731-347重合的X射线点源都具有类似AXP的光谱,比普通的旋转动力源的光谱软得多,并且没有光学/IR对应物。CTB 37 B中CXCRJ 171405.7 -381031的光谱具有高于6 keV的硬过量,这可能与在一些AXP中看到的此类组分相似。一个新的钱德拉观察这个对象揭示了一个非常重要的脉冲信号在P = 3.82秒与脉冲分数f_p = 0.31。对第二个候选天体(G353.6-0.7中的XMMU J173203.3-344518)的XMM-Newton观测结果的分析,只产生了1 s周期的边缘证据。如果它不是磁星,那么它可能是一个弱磁化的中心致密天体(CCO)。考虑到这些HESS源以前归因于SNR壳可能是中央峰值,我们假设,他们的ESTA可能有助于扩散TeV的排放。这些鉴定可能使银河系中磁星/SNR协会的数量增加一倍,并可用于调查产生磁星的超新星的能量学和不对称性。

英文摘要:

We identify two candidate magnetars in archival X-ray observations of HESS detected shell-type SNRs. X-ray point sources in CTB 37B coincident with HESS J1713-381 and in G353.6-0.7 coincident with HESS J1731-347 both have AXP-like spectra, much softer than those of ordinary, rotation powered pulsars, and no optical/IR counterparts. The spectrum of CXOU J171405.7-381031 in CTB 37B has a hard excess above 6 keV, which may be similar to such components seen in some AXPs. A new Chandra observation of this object reveals a highly significant pulsed signal at P = 3.82 s with pulsed fraction f_p = 0.31. Analysis of an XMM-Newton observation of the second candidate, XMMU J173203.3-344518 in G353.6-0.7, yields only marginal evidence for a 1 s period. If it is not a magnetar, then it could be a weakly magnetized central compact object (CCO). Considering that these HESS sources previously attributed to the SNR shells are possibly centrally peaked, we hypothesize that their pulsars may contribute to diffuse TeV emission. These identifications potentially double the number of magnetar/SNR associations in the Galaxy, and can be used to investigate the energetics and asymmetries of the supernovae that give rise to magnetars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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