论文标题
表征巨大恒星形成区W75N（B）中源的无线电连续性性质
Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)
论文作者
论文摘要
巨大的恒星形成区W75n〜（b）被认为是一个大规模的质子（Vla〜1，vla〜2和vla〜3），经历了不同的进化阶段。在这项工作中，我们介绍了迄今为止在该区域获得的最高灵敏度和角度分辨率的无线电连续数据，并使用VLA-A，并涵盖了广泛的频率（4-48〜GHz），这使我们能够研究不同无线电源的发射的形态和发射的性质。我们还以1.3 mm波长进行了多上述VLA数据和ALMA存档数据进行互补研究。我们发现VLA〜1正在以$ \ $ \ $ 0.1 arcsec（$ \ $ \ $ 130 au）的尺度上驾驶热无线电喷气机，但也显示出一个初期的超级压缩HII区域的迹象，该区域是$ \ lyssim $ 1 $ 1 arcsec（$ \ $ \ lisesim $ 1300〜 au）。 VLA〜3还在数十分之一的Arcsec（几百个AU）的尺度上驱动热无线电射流。我们得出的结论是，这款喷射是令人震惊的电台连续源BC和VLA〜4（遮盖的HH对象），该速度显示出适当的运动，以$ \ $ \ $ \ $ 112---118〜 km/s的速度向外移动。我们还检测到了三个新的弱无线电连续源，其中两个与ALMA观察到的毫米连续核有关，这表明这两个源也嵌入了这个巨大的恒星形成区域。
The massive star-forming region W75N~(B) is thought to host a cluster of massive protostars (VLA~1, VLA~2, and VLA~3) undergoing different evolutionary stages. In this work, we present radio continuum data with the highest sensitivity and angular resolution obtained to date in this region, using the VLA-A and covering a wide range of frequencies (4-48~GHz), which allowed us to study the morphology and the nature of the emission of the different radio continuum sources. We also performed complementary studies with multi-epoch VLA data and ALMA archive data at 1.3 mm wavelength. We find that VLA~1 is driving a thermal radio jet at scales of $\approx$0.1 arcsec ($\approx$130 au), but also shows signs of an incipient hyper-compact HII region at scales of $\lesssim$ 1 arcsec ($\lesssim$ 1300~au). VLA~3 is also driving a thermal radio jet at scales of a few tenths of arcsec (few hundred of au). We conclude that this jet is shock-exciting the radio continuum sources Bc and VLA~4 (obscured HH objects), which show proper motions moving outward from VLA~3 at velocities of $\approx$112--118~km/s. We have also detected three new weak radio continuum sources, two of them associated with millimeter continuum cores observed with ALMA, suggesting that these two sources are also embedded YSOs in this massive star-forming region.
