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arXiv 1901.08533astro-ph.HE
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热辐射孤立中子星RX J1605 .3+3249的XMM-牛顿深度观测

A deep XMM-Newton look on the thermally emitting isolated neutron star RX J1605.3+3249

Adriana M. Pires, Axel D. Schwope, Frank Haberl, Vyacheslav E. Zavlin, Christian Motch, Silvia Zane

摘要:

先前XMM-牛顿对热发射孤立中子星RX J1605.3+3249的观测提供了一个浅周期信号的候选者和快速自旋下降的证据,这表明了一个高偶极磁场和磁星的演化。我们获得了一个大型的程序与XMM-牛顿,以确认其候选的定时解决方案,了解能量依赖的调制幅度,并调查的频谱特征的来源。我们在新的观测中进行了广泛的高分辨率和宽带周期性搜索,使用三台EPIC相机的组合光子,并允许脉冲分数和最佳检测能量范围的适度变化。用于相关频率范围中的调制的深度$4σ$上限$1.33(6)\%$保守地排除了先前报告的候选周期。盲法搜索显示,在四个新观察中的任何一个中都没有高于$1.5\%$水平($(3σ$)的其他周期性信号。虽然理论模型在物理上描述的复杂的能量分布的源,最佳拟合的X射线光谱参数获得的完全或部分电离的中子星氢大气模型与$B=10^{13}$ G,修改了宽高斯吸收线在$385\pm10$ eV。时间分析的深度限制不利于同样拟合良好的双温黑体模型,其中恒星表面和小热点都对源的X射线通量有贡献。我们确定了一个低的显着性($1σ$)的时间趋势上的源的参数在分析的RGS数据可以追溯到2002年,这可能是解释不明的校准问题和光谱模型的不确定性。新的数据集也没有显示出以前报道的在$\sim570$ eV处的窄吸收特征的证据,其可能的瞬态性质不利于大气起源。

英文摘要:

Previous XMM-Newton observations of the thermally emitting isolated neutron star RX J1605.3+3249 provided a candidate for a shallow periodic signal and evidence of a fast spin down, which suggested a high dipolar magnetic field and an evolution from a magnetar. We obtained a large programme with XMM-Newton to confirm its candidate timing solution, understand the energy-dependent amplitude of the modulation, and investigate the spectral features of the source. We performed extensive high-resolution and broadband periodicity searches in the new observations, using the combined photons of the three EPIC cameras and allowing for moderate changes of pulsed fraction and the optimal energy range for detection. A deep $4σ$ upper limit of $1.33(6)\%$ for modulations in the relevant frequency range conservatively rules out the candidate period previously reported. Blind searches revealed no other periodic signal above the $1.5\%$ level $(3σ$) in any of the four new observations. While theoretical models fall short at physically describing the complex energy distribution of the source, best-fit X-ray spectral parameters are obtained for a fully or partially ionized neutron star hydrogen atmosphere model with $B=10^{13}$ G, modified by a broad Gaussian absorption line at $385\pm10$ eV. The deep limits from the timing analysis disfavour equally well-fit double temperature blackbody models where both the star surface and small hotspots contribute to the X-ray flux of the source. We identified a low significance ($1σ$) temporal trend on the parameters of the source in the analysis of RGS data dating back to 2002, which may be explained by unaccounted calibration issues and spectral model uncertainties. The new dataset also shows no evidence of the previously reported narrow absorption feature at $\sim570$ eV, whose possible transient nature disfavours an atmospheric origin.

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