论文标题

积聚爆发源G358.93-0.03-mm1的多转变甲醇maser研究

A multi-transition methanol maser study of the accretion burst source G358.93-0.03-MM1

论文作者

Bayandina, O. S., Brogan, C. L., Burns, R. A., Chen, X., Hunter, T. R., Kurtz, S. E., MacLeod, G. C., Sobolev, A. M., Sugiyama, K., Val'tts, I. E., Yonekura, Y.

论文摘要

我们介绍了在爆发和爆发后时期G358.93-0.03中检测到的厘米波长甲醇泥浆体的最完整的干涉测量研究。最近在G358.93-0.03中发现了独特的NIR/(sub)mm-dark和fir-loud myso积聚爆发。该事件伴随着前所未有的稀有甲醇maser过渡的耀斑。这项工作介绍了6.18、12.23和20.97 GHz的新发现的三个甲醇果酱的第一张图像。在两个时期研究了甲醇masers在6.67、12.18和23.12 GHz处的空间结构演变。所有检测到的过渡中的maser排放位于$ \ sim $ 0.2 $ 0.2 $^{\ prime \ prime} $周围周围的爆发源,并在南北方向显示了清晰的速度梯度,南北具有红色偏移的特征,南部的北部和蓝色瞬变特征。发现了Masing区域的空间形态发生了巨大变化:在时代I处检测到的一个密集,紧凑的“螺旋”簇变成了Epoch II的分散“圆形”结构。在从第一个时期到第二个时期的过渡期间,Masers追踪的地区扩展了。我们的结果与互补VLA,VLBI,SMA和Alma Maser数据的比较。获得的甲醇maser数据支持积聚盘中螺旋臂结构的存在的假设,这在先前对来源的研究中提出。

We present the most complete to date interferometric study of the centimeter wavelength methanol masers detected in G358.93-0.03 at the burst and post-burst epochs. A unique, NIR/(sub)mm-dark and FIR-loud MYSO accretion burst was recently discovered in G358.93-0.03. The event was accompanied by flares of an unprecedented number of rare methanol maser transitions. The first images of three of the newly-discovered methanol masers at 6.18, 12.23, and 20.97 GHz are presented in this work. The spatial structure evolution of the methanol masers at 6.67, 12.18, and 23.12 GHz is studied at two epochs. The maser emission in all detected transitions resides in a region of $\sim$0.2$^{\prime\prime}$ around the bursting source and shows a clear velocity gradient in the north-south direction, with red-shifted features to the north and blue-shifted features to the south. A drastic change in the spatial morphology of the masing region is found: a dense and compact "spiral" cluster detected at epoch I evolved into a disperse, "round" structure at epoch II. During the transition from the first epoch to the second, the region traced by masers expanded. The comparison of our results with the complementary VLA, VLBI, SMA, and ALMA maser data is conducted. The obtained methanol maser data support the hypothesis of the presence of spiral-arm structures within the accretion disk, which was suggested in previous studies of the source.

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