AEGIS z~1 X射线选择活动星系核的主星系色梯度和吸积盘遮蔽
Host galaxy colour gradients and accretion disc obscuration in AEGIS z~1 X-ray-selected active galactic nuclei
摘要：
我们描述了活动星系核光对宿主星系光学和紫外光学颜色的影响，从X射线选择的活动星系核宿主星系在z~1确定，并比较活动星系核宿主星系的颜色的控制样本匹配的活动星系核样本的红移和恒星质量。我们识别出8.7 + 4/-3%的红色序列控制星系、9.8 +/-3%的蓝色云控制星系和14.7 + 4/-3%的绿谷控制星系为X射线选择的活动星系核。活动星系核的颜色通常比其外部颜色更蓝，而控制星系的核则更红。在蓝云宿主星系中活动星系核的X射线遮蔽较少，而在红序宿主星系中活动星系核的遮蔽较多，这与一般对星际介质的考虑相反。无论X射线遮蔽与否，活动星系核的外部颜色和整体颜色通常与控制星系一致，但未遮蔽的活动星系核的核颜色通常要蓝得多，特别是对于X射线发光物体。其中许多都可以看到可见的点源，这表明核的颜色已经被活动星系核的光所污染，因此X射线辐射和可见光的遮蔽是高度相关的。红色活动星系核的主体通常比红色序列控制星系略蓝，这表明它们的恒星星族略年轻。我们将这些颜色数据与目前的活动星系核形成模型进行了比较。在所有活动星系核反馈模型中，蓝云星系的X射线遮蔽较少，而红序星系的遮蔽较多，这一意想不到的趋势是有问题的，在这些模型中，气体和尘埃被认为是随着恒星形成的停止而被移除的。[See全文摘要）。
英文摘要：
We describe the effect of AGN light on host galaxy optical and UV-optical colours, as determined from X-ray-selected AGN host galaxies at z~1, and compare the AGN host galaxy colours to those of a control sample matched to the AGN sample in both redshift and stellar mass. We identify as X-ray-selected AGNs 8.7 +4/-3 per cent of the red-sequence control galaxies, 9.8 +/-3 per cent of the blue-cloud control galaxies, and 14.7 +4/-3 per cent of the green-valley control galaxies. The nuclear colours of AGN hosts are generally bluer than their outer colours, while the control galaxies exhibit redder nuclei. AGNs in blue-cloud host galaxies experience less X-ray obscuration, while AGNs in red-sequence hosts have more, which is the reverse of what is expected from general considerations of the interstellar medium. Outer and integrated colours of AGN hosts generally agree with the control galaxies, regardless of X-ray obscuration, but the nuclear colours of unobscured AGNs are typically much bluer, especially for X-ray luminous objects. Visible point sources are seen in many of these, indicating that the nuclear colours have been contaminated by AGN light and that obscuration of the X-ray radiation and visible light are therefore highly correlated. Red AGN hosts are typically slightly bluer than red-sequence control galaxies, which suggests that their stellar populations are slightly younger. We compare these colour data to current models of AGN formation. The unexpected trend of less X-ray obscuration in blue-cloud galaxies and more in red-sequence galaxies is problematic for all AGN feedback models, in which gas and dust is thought to be removed as star formation shuts down. [See paper for full abstract.]
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