经典新星V458 Vulpeculae与朱雀的X射线光谱
X-Ray Spectroscopy of the Classical Nova V458 Vulpeculae with Suzaku
摘要：
我们使用朱雀卫星对经典新星V458 Vulpeculae在爆炸后88天进行了机会目标X射线观测。在20 ks曝光下，X射线成像光谱仪检测到的X射线发射明显比典型的超软源发射更硬。X射线光谱显示来自N、Ne、Mg、Si和S的K线，以及来自高度电离状态的Fe的L系列发射。该谱可用单温（0.64 keV）薄热等离子体模型描述，在碰撞平衡状态下，氢当量消光柱密度约为3e 21/cm ~ 2，通量约为1 e-12 erg/s/cm ~ 2，在0.3-3.0 keV波段，假设距离为13 kpc，光度约为6 e34 erg/s。我们发现了一个提示的增强N和不足的O和Fe相对于其他金属。观测到的X射线特性可以解释为从ONe型新星喷出物的冲击所产生的发射。
英文摘要：
We conducted a target of opportunity X-ray observation of the classical nova V458 Vulpeculae 88 days after the explosion using the Suzaku satellite. With a 20 ks exposure, the X-ray Imaging Spectrometer detected X-ray emission significantly harder than typical super-soft source emission. The X-ray spectrum shows K lines from N, Ne, Mg, Si, and S, and L-series emission from Fe in highly ionized states. The spectrum can be described by a single temperature (0.64 keV) thin thermal plasma model in collisional equilibrium with a hydrogen-equivalent extinction column density of ~3e21/cm2, a flux of ~1e-12 erg/s/cm2, and a luminosity of ~6e34 erg/s in the 0.3-3.0 keV band at an assumed distance of 13 kpc. We found a hint of an enhancement of N and deficiencies of O and Fe relative to other metals. The observed X-ray properties can be interpreted as the emission arising from shocks of ejecta from an ONe-type nova.
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