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arXiv 0802.0178astro-ph
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双脉冲星系统J0737-3039的甚软X射线谱

The very soft X-ray spectrum of the Double Pulsar System J0737-3039

A. Possenti, N. Rea, M. A. McLaughlin, F. Camilo, M. Kramer, M. Burgay, B. C. Joshi, A. G. Lyne

摘要:

本文给出了对双脉冲星系统J 0737 -3039的80 ksChandra ACIS-S观测结果。此外,我们报告的组合X射线观测到目前为止,该系统的光谱,空间和时间分析。拟合共约1100个光子,我们表明,X射线光谱的J 0737 -3039系统是非常软的,并没有令人满意地模拟一个简单的黑体或大气模型。然而,还不可能区分X射线发射的主要非热源和主要热源。采用一个简单的幂律发射模型,PSR J 0737 - 3039 A的光子指数(伽马=3.7)和旋转能量转化为X射线发射的隐含转换效率(4.1 × 10 ^-4,距离源为500 pc)与PSR J 0737 - 3039 A磁层中发射的X射线光子是一致的。这一假设也得到了可检测X射线轨道调制(高达~20%)或任何X射线星云发射的支持,并且与PSR J 0737 - 3039 A的高(~75%)X射线脉冲分数一致。双黑体模型或康普顿化黑体模型也能重现这些数据,氢柱密度N_H <10^20 cm^-2的上限值(相对于幂律模型)与银河系在该方向和该距离上的N_H值更吻合。对于两个黑体模型,隐含的发射半径和温度也与在其他回收的中子星中看到的一致,这要求大部分X射线光子来自脉冲星A表面的加热区域。另一方面,在康普顿化黑体模型中,电子温度似乎明显小于其他类似物体。

英文摘要:

We present the results of an 80 ks Chandra ACIS-S observation of the double pulsar system J0737-3039. Furthermore, we report on spectral, spatial and timing analysis of the combined X-ray observations performed so far for this system. Fitting a total of ~1100 photons, we show that the X-ray spectrum of the J0737-3039 system is very soft, and not satisfactorily modeled by a simple blackbody or an atmospheric model. However, it is not possible yet to discriminate between a predominantly non-thermal and a predominantly thermal origin for the X-ray emission. Adopting a simple power-law emission model, the photon index (Gamma=3.7) and the implied conversion efficiency of the rotational energy of PSR J0737-3039A into X-ray emission (4.1x10^-4, for a distance to the source of 500 pc) are compatible with the X-ray photons being emitted in the magnetosphere of PSR J0737-3039A. This hypothesis is also supported by the absence of detectable X-ray orbital modulation (up to ~20%) or any X-ray nebular emission and it is in agreement with the high (~75%) X-ray pulsed fraction of PSR J0737-3039A. A two blackbody or a Comptonized blackbody model also reproduce the data, and the upper limit to the value of the hydrogen column density N_H <10^20 cm^-2, is in better agreement (with respect to the power-law model) with the Galactic N_H in that direction and at that distance. For the two blackbody model the implied emission radii and temperatures are also compatible with those seen in other recycled pulsars, calling for the bulk of the X-ray photons being originated from heated regions at the surface of pulsar A. On the other hand, in the Comptonized blackbody model, the electron temperature seems to be significantly smaller than in other similar objects.

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