银河系黑洞吸积流Brackett-γ辐射的上限
Upper Limit on Brackett-gamma Emission from the Immediate Accretion Flow onto the Galactic Black Hole
摘要：
我们提出的第一个观测约束Br-γ复合线发射与超大质量黑洞在我们的银河系中心，被称为Sgr A*。通过将13年的数据与美国华盛顿大学的自适应光学馈电积分场摄谱仪OSIRIS相结合。M.凯克天文台获得的银河系中心轨道计划的一部分，我们提取的近红外光谱内的黑洞的~ 0.2“，我们得出的Br-伽马流量的上限。孔径被设置为与最近基于氢复合线H30-alpha的毫米波ALMA观测报告的盘状结构的大小相匹配。我们严格的上限至少是一个因素的80（高达245的因素）低于预期的ALMA测量和强烈约束可能的解释，从这个高度发光不足的超大质量黑洞的排放。
英文摘要：
We present the first observational constraint on the Br-gamma recombination line emission associated with the supermassive black hole at the center of our Galaxy, known as Sgr A*. By combining 13 years of data with the Adaptive Optics fed integral field spectrograph OSIRIS at the W. M. Keck Observatory obtained as part of the Galactic Center Orbits Initiative, we extract the near-infrared spectrum within ~0.2'' of the black hole and we derive an upper limit on the Br-gamma flux. The aperture was set to match the size of the disk-like structure that was recently reported based on millimeter-wave ALMA observations of the hydrogen recombination line, H30-alpha. Our stringent upper limit is at least a factor of 80 (and up to a factor of 245) below what would be expected from the ALMA measurements and strongly constrains possible interpretation of emission from this highly under-luminous supermassive black hole.
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