论文标题
红色和蓝色类星体的性质的根本差异：用X-Shooter测量红色和积聚性能
Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter
论文作者
论文摘要
与典型的蓝色类星体相比，我们最近发现红色类星体无线电性能的根本差异。在本文中，我们使用X-Shooter数据，提供$ \ sim 3000-25000 $ ANG的频谱覆盖范围，以$ 1.45 <z <1.65 $的40个红色和蓝色发光类星体样本来探索无线电，发射线和积分式托盘之间的连接。我们将各种尘埃扩散曲线拟合到数据，发现灰尘变红可以完全解释样品中大多数红色类星体的观察到的颜色，中等灭绝的范围从AV $ \ sim 0.06-0.7 $ mags不等。我们面对一个简单的薄积聚盘模型，发现这可以描述蓝色和红色类星体的连续性，一旦校正了粉尘灭绝。我们还发现积聚性能没有显着差异。我们在许多红色和蓝色类星体中检测到电离流出，但没有发现任何重要的证据表明它们在红色类星体种群中更为普遍。总体而言，我们的发现表明，无线电发射与透明度/ISM不透明度密切相关，而不是积聚盘或流出差异。
We have recently found fundamental differences in the radio properties of red quasars when compared to typical blue quasars. In this paper we use X-shooter data, providing spectral coverage from $\sim 3000-25000$ Ang, of a sample of 40 red and blue luminous quasars at $1.45<z<1.65$ to explore the connections between the radio, emission-line, and accretion-disc properties. We fit various dust-extinction curves to the data and find that dust reddening can fully explain the observed colours for the majority of the red quasars in our sample, with moderate extinctions ranging from Av$\sim 0.06-0.7$ mags. We confront our spectra with a simple thin accretion-disc model and find this can describe the continua of both the blue and red quasars, once corrected for dust extinction; we also find no significant differences in the accretion properties. We detect ionized outflows in a number of red and blue quasars, but do not find any significant evidence that they are more prevalent in the red quasar population. Overall our findings imply that the radio emission is more closely connected to circumnuclear/ISM opacity rather than accretion disc or outflow differences.
