4C+22.25的奇特光谱：大质量黑洞双星的印记？
The peculiar optical spectrum of 4C+22.25: Imprint of a massive black hole binary?
摘要：
我们报告发现的特殊功能的光谱的4C+22.25，平谱射电类星体在z=0.4183观察到的SDSS和一个专门的光谱后续从北欧光学望远镜。相对于窄的发射线，H β和H α线显示出宽的剖面（FWHM~ 12，000 km/s）、微弱的通量和极端的偏移（Δ v= 8，700 +/-1，300 km/s）。这些特征在约3.1年的时滞（静止帧）中没有显着变化。我们排除了可能的解释的基础上叠加的两个源或反冲黑洞，我们讨论的优点和局限性的一个巨大的黑洞二进制的情况。
英文摘要：
We report the discovery of peculiar features in the optical spectrum of 4C+22.25, a flat spectrum radio quasar at z=0.4183 observed in the SDSS and in a dedicated spectroscopic follow-up from the Nordic Optical Telescope. The Hbeta and Halpha lines show broad profiles (FWHM~12,000 km/s), faint fluxes and extreme offsets (Delta v=8,700+/-1,300 km/s) with respect to the narrow emission lines. These features show no significant variation in a time lag of ~3.1 yr (rest frame). We rule out possible interpretations based on the superposition of two sources or on recoiling black holes, and we discuss the virtues and limitations of a massive black hole binary scenario.
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