类星体E1821 +643中被踢出的超大质量黑洞的光谱偏振证据
Spectropolarimetric evidence for a kicked supermassive black hole in the Quasar E1821+643
摘要：
本文报道了类星体E1821+643（z=0.297）的分光偏振观测结果，这表明它可能是一个超大质量黑洞（SMBH）双星合并后引力波各向异性发射引起的引力反冲的例子。在总通量中，宽巴耳末线相对于窄巴耳末线红移约1000 km/s，并具有高度的红色不对称性，而在偏振通量中，宽H_α线表现出类似幅度的蓝移和强烈的蓝色不对称性。我们表明，这些意见是一致的散射模型中，宽线区域有两个组成部分，移动不同的散装速度远离观察者和朝向散射区域在主机星系休息。如果高速系统被确定为与SMBH结合的气体，这意味着SMBH本身相对于宿主星系的速度约为2100 km/s。我们讨论了反冲假说的一些影响，并简要地考虑我们的观察是否可以解释在散射的宽线发射来自主动组件的SMBH二进制，或从外流风。
英文摘要：
We report spectropolarimetric observations of the quasar E1821+643 (z=0.297), which suggest that it may be an example of gravitational recoil due to anisotropic emission of gravitational waves following the merger of a supermassive black hole (SMBH) binary. In total flux, the broad Balmer lines are redshifted by ~1000 km/s relative to the narrow lines and have highly red asymmetric profiles, whereas in polarized flux the broad H_alpha line exhibits a blueshift of similar magnitude and a strong blue asymmetry. We show that these observations are consistent with a scattering model in which the broad-line region has two components, moving with different bulk velocities away from the observer and towards a scattering region at rest in the host galaxy. If the high velocity system is identified as gas bound to the SMBH, this implies that the SMBH is itself moving with a velocity ~2100 km/s relative to the host galaxy. We discuss some implications of the recoil hypothesis and also briefly consider whether our observations can be explained in terms of scattering of broad-line emission originating from the active component of an SMBH binary, or from an outflowing wind.
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