论文标题
Neil Gehrels Swift天文台观察到的Novae的紫外线和X射线曲线
Ultraviolet and X-ray light-curves of novae observed by the Neil Gehrels Swift Observatory
论文作者
论文摘要
Neil Gehrels Swift天文台具有快速的响应能力以及对其观察时间表的日常计划，是监视瞬态和可变来源的理想选择。在这里，我们提出了12个Novae的样本，其中包括Swift最详细的紫外线（UV）随访，这是对此类UV光曲线的首次均匀分析。这些特定的光曲线的褪色可以建模为幂律腐烂（在对数时间中绘制幅度），表明相同的物理过程在单个对象的延长时间间隔中占主导地位的UV发射。核燃烧间隔结束后，X射线发射显着下降，逐渐减少约10-100倍。但是，紫外线变化的幅度较低，在同一时期内下降了1-2个磁场。紫外线曲线通常在X射线光曲线从最大值开始稳定下降的时间（〜0.7-1.3 T_SSSSEND）开始稳定下降时，通常显示出从扁平到陡峭的突破。考虑到经典和复发性的人群以及具有主要序列或巨型同伴的人的种群，我们没有发现紫外线曲线或它们的演变有任何强烈的差异，尽管长期的复发性早期的Novae比大多数经典Novae都更加发光。
With rapid response capabilities, and a daily planning of its observing schedule, the Neil Gehrels Swift Observatory is ideal for monitoring transient and variable sources. Here we present a sample of the 12 novae with the most detailed ultraviolet (UV) follow-up by Swift -- the first uniform analysis of such UV light-curves. The fading of these specific light-curves can be modelled as power-law decays (plotting magnitude against log time), showing that the same physical processes dominate the UV emission for extended time intervals in individual objects. After the end of the nuclear burning interval, the X-ray emission drops significantly, fading by a factor of around 10-100. The UV changes, however, are of a lower amplitude, declining by 1-2 mag over the same time period. The UV light-curves typically show a break from flatter to steeper around the time at which the X-ray light-curve starts a steady decline from maximum, ~0.7-1.3 T_SSSend. Considering populations of both classical and recurrent novae, and those with main sequence or giant companions, we do not find any strong differences in the UV light-curves or their evolution, although the long-period recurrent novae are more luminous than the majority of the classical novae.
