arXiv 0706.25732007-06-18astro-ph

高磁场射电脉冲星PSR J1119-6127的VLT/NACO观测

VLT/NACO observations of the High-Magnetic field radio pulsar PSR J1119-6127

R. P. Mignani, R. Perna, N. Rea, G. L. Israel, S. Mereghetti, G. Lo Curto

备注：: 8 pages, 4 figures, A&A, in press
DOI：: 10.1051/0004-6361:20077486

摘要：

最近的无线电观测揭示了在磁星范围内存在着一些具有下旋派生磁场的无线电双星。然而，它们的观测性质似乎更类似于经典的射电双星，而不是磁星。为了解开这个谜团，我们首先必须确定这些射电望远镜的自旋下降导出的磁场值是否确实代表了实际的中子星磁场，或者它们是否被污染了，例如被后备磁盘的扭矩影响。为了研究这种可能性，我们用ESO VLT对其中一颗高磁场射电星（PSR J1119-6127）进行了深红外观测，以寻找与圆盘相关的红外辐射。从脉冲星位置到J=24，H=23，Ks=22，没有检测到红外辐射。通过将我们的通量上限与后备盘模型的预测进行比较，我们发现我们只能排除吸积率M >3x10^16 g/s的盘的存在。这个下限不能排除脉冲星上存在一个相当大的圆盘扭矩，这将导致高估由P和点P推断出的磁场的值。

英文摘要：

Recent radio observations have unveiled the existence of a number of radio pulsars with spin-down derived magnetic fields in the magnetar range. However, their observational properties appears to be more similar to classical radio pulsars than to magnetars. To shed light on this puzzle we first have to determine whether the spin-down derived magnetic field values for these radio pulsars are indeed representative of the actual neutron star magnetic field or if they are polluted, e.g. by the effects of a torque from a fallback disk. To investigate this possibility, we have performed deep IR observations of one of these high magnetic field radio pulsars (PSR J1119-6127) with the ESO VLT to search for IR emission which can be associated with a disk. No IR emission is detected from the pulsar position down to J=24, H=23, Ks=22. By comparing our flux upper limits with the predictions of fallback disk models, we have found that we can only exclude the presence of a disk with accretion rate dot M >3x10^16 g/s. This lower limit cannot rule out the presence of a substantial disk torque on the pulsar, which would then lead to overestimate the value of the magnetic field inferred from P and dot P.

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