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SEARCH FOR CIRCUMSTELLAR DISKS AND RADIO JETS IN THE MASSIVE STAR-FORMATION REGION IRAS 23033+5951

机译:在大质量恒星形成区域IRAS 23033 + 5951中搜索圆盘和无线电射流

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We present radio continuum (1.3 and 3.6?cm) and H2O maser observations toward the high-mass star-forming region IRAS 23033+5951 carried out with the VLA-EVLA (in transition phase) in the A configuration. Three radio continuum sources are detected at 3.6?cm, which are aligned in the east-west direction. However, no continuum emission is detected in the region at 1.3?cm. Based on the continuum information, we find that the two continuum sources detected in the region could be consistent with ultracompact H II regions harboring ZAMS B2 and B2.5 stars; however, we do not rule out that they could be associated with a radio jet. In addition, nine water maser spots are detected toward IRAS 23033+5951, which are clustered in two groups and located about 2'' to the south of the continuum sources. The spatio-kinematical distribution of the water masers suggests that they are tracing a circumstellar disk associated with a central star ZAMS B0, which could be the least evolved source in the region and has not developed an H II region yet. Moreover, as the circumstellar disk seems to be associated with the CO molecular outflow observed in the region, this conforms to a disk-YSO-outflow system, similar to that found in low-mass stars.
机译:我们介绍了以VLA-EVLA(处于过渡阶段)在A构型下对高质量恒星形成区域IRAS 23033 + 5951进行的无线电连续谱(1.3和3.6?cm)和H2O maser观测。在3.6?cm处检测到三个无线电连续体源,它们沿东西方向排列。但是,在1.3?cm的区域没有检测到连续发射。基于连续谱信息,我们发现在该区域中检测到的两个连续谱源可能与包含ZAMS B2和B2.5星的超紧凑H II区域一致。但是,我们不排除它们可能与无线电喷气机相关联。此外,在IRAS 23033 + 5951处检测到9个水激射斑,这些斑分为两个组,位于连续源南侧约2''处。水脉的时空运动分布表明它们正在追踪与中心恒星ZAMS B0相关的星际盘,该恒星可能是该区域演化最少的源,尚未发育成H II区。此外,由于星际盘似乎与该区域观测到的CO分子外流有关,因此与低质量恒星中发现的盘YSO外流系统相符。

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