We present high spatial resolution ($52$ au) observations of the high-mass young stellar object (HMYSO) G345.4938+01.4677 made using the Atacama Large Millimeter/sub-millimeter Array (ALMA). This O-type HMYSO is located at 2.38 kpc and it is associated with a luminosity of $1.5\times10^5 L_\odot$. We detect circumstellar emission from the H$38\beta$ hydrogen recombination line showing a compact structure rotating perpendicularly to the previously detected radio jet. We interpret this emission as tracing a photo-ionized accretion disk around the HMYSO. While this disk-like structure seems currently too small to sustain continued accretion, the data present direct observational evidence of how disks can effectively survive the photo-ionization feedback from young high-mass stars. We also report the detection of a low-mass young stellar object in the vicinity of the HMYSO and suggest that it forms a high-mass and low-mass star binary system.

中文翻译：

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一颗年轻大质量恒星周围的光电离吸积盘

我们展示了使用阿塔卡马大型毫米/亚毫米阵列 (ALMA) 对大质量年轻恒星天体 (HMYSO) G345.4938+01.4677 进行的高空间分辨率（52 美元）观测。这个 O 型 HMYSO 位于 2.38 kpc，它的光度为 $1.5\times10^5 L_\odot$。我们检测到来自 H$38\beta$ 氢复合线的星周发射，显示出与先前检测到的射流垂直旋转的紧凑结构。我们将这种发射解释为追踪 HMYSO 周围的光离子吸积盘。虽然这种盘状结构目前似乎太小而无法维持持续的吸积，但数据提供了直接的观测证据，证明盘如何能够有效地从年轻的大质量恒星的光电离反馈中幸存下来。