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ACCRETION DISKS IN THE IRAS 23151+5912 REGION

机译:IRAS 23151 + 5912地区的增生碟

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摘要

We present observations of radio continuum emission at 1.3 and 3.6?cm and H2O masers toward the high-mass star-forming region IRAS 23151+5912 carried out with the Very Large Array-Expanded Very Large Array (in transition phase) in configuration A. We detected one continuum source at 1.3?cm in the region, but the counterpart of this radio continuum source at 3.6?cm was not detected at a level of 3σ. We also detected 13 water maser spots toward IRAS 23151+5912, which are distributed in three groups aligned along the northeast-southwest direction. Our results suggest that the 1.3?cm emission is consistent with a hypercompact H II region, probably with an embedded zero-age main-sequence star of type B2. In particular, we find that this young star is spatially associated with a maser group, which is tracing a disk-like structure of about 460?AU. We also find that the masers of the second group are probably describing a circumstellar disk of about 86?AU, whose central protostar, still undetected, should have a mass of ~11 M ☉. We also suggest that the third water maser group is possibly associated with the SiO outflow and the undetected driving source of the system. Finally, we noted that the 1.3?cm continuum source and the three maser groups are aligned in the northeast-southwest direction, similar to the elongation of the large ionized region, which probably is the result of shock-wave induced star formation on the densest region of the medium.
机译:我们介绍了在配置A中使用超大型阵列扩展超大型阵列(处于过渡阶段)在1.3和3.6?cm处出现的无线电连续谱发射和H2O向着大质量恒星形成区域IRAS 23151 + 5912扩散的现象。我们在该区域的1.3?cm处检测到一个连续谱源,但在3σ的水平上未检测到该无线电连续体源在3.6?cm处的对应谱源。我们还检测到朝向IRAS 23151 + 5912的13个水脉斑,它们沿东北-西南方向按三组分布。我们的结果表明,1.3?cm的发射与超紧凑的H II区一致,可能与B2型的嵌入零年龄主序星有关。特别是,我们发现这颗年轻的恒星在空间上与一个maser群相关联,后者正在追踪约460?AU的盘状结构。我们还发现,第二组微波激射器可能正在描述一个约86?AU的星际盘,其中央原恒星(仍未被发现)应具有〜11 M mass的质量。我们还建议,第三水基团可能与SiO流出和系统未检测到的驱动源有关。最后,我们注意到1.3?cm连续谱源和三个maser组在东北-西南方向排列,类似于大电离区域的伸长,这可能是最密集的激波形成恒星的结果媒体区域。

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