GALEX测量软X射线选择性AGN中的蓝色大凸起
GALEX Measurements of the Big Blue Bump in Soft X-ray Selected AGN
摘要：
我们研究了ROSAT全天巡天的I型活动星系核的紫外特性，这些活动星系核被选择来显示异常软的X射线连续谱。我们研究了一个样本的54个塞弗特1星系在近紫外和远紫外波段的星系演化探测器（GALEX）卫星的检测。我们的样本是系统暗淡的紫外线比以前的作者在类似的工作中研究的星系。我们寻找它们的紫外和X射线属性之间的相关性，以及这些属性与黑洞质量或爱丁顿比的相关性。在GALEX制度的大蓝色凸块（BBB）的形状似乎并不相关，其强度相对于幂律连续体，这与以前的作者报道的结果相冲突。BBB的强度与X射线连续体的形状相关，与以前的工作一致，但相关性的斜率与以前报道的不同。在GALEX区，I型活动星系核的吸积盘的性质与黑洞质量和爱丁顿比相对无关。我们将我们的测量结果与其他理论对软过剩起源的预测进行了比较，但我们无法区分热等离子体对BBB光子的康普顿化和相对论风中的吸收是软X射线过剩最有可能的起源。
英文摘要：
We study the UV properties of Type I AGN from the ROSAT All-Sky Survey that have been selected to show unusually soft X-ray continua. We examine a sample of 54 Seyfert 1 galaxies with detections in both Near-UV and Far-UV bands of the Galaxy Evolution Explorer (GALEX) satellite. Our sample is systematically fainter in the UV than galaxies studied in similar work by previous authors. We look for correlations between their UV and X-ray properties as well as correlations of these properties with either black hole mass or Eddington ratio. The shape of the Big Blue Bump(BBB) in the GALEX regime does not appear to correlate with its strength relative to the power law continuum, which conflicts with results reported by previous authors. The strength of the BBB is correlated with the shape of the X-ray continuum, in agreement with previous work, but the slope of the correlation is different than previously reported. The properties of the accretion disks of Type I AGN in the GALEX regime are relatively independent of black hole mass and Eddington ratio. We compare our measurements to the predictions of alternative theories for the origin of the soft excess, but we are unable to distinguish between Comptonization of BBB photons by a hot plasma and absorption in relativistic winds as the most likely origins for the soft X-ray excess.
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