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논문

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Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B) SCI
  • A. Rodriguez-Kamenetzky; C. Carrasco-Gonzalez; J. M. Torrelles; 외
  • 2020-08-01
  • MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 496 3 : 3128~3141
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, wepresent radio continuum data with the highest sensitivity and angular resolution obtained todate 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 radiocontinuum sources. We also performed complementary studies with multi-epoch Very LargeArray (VLA) data and Atacama Large Millimeter Array (ALMA) archive data at 1.3 mmwavelength. We find that VLA 1 is driving a thermal radio jet at scales of ?0.1 arcsec (?130au), but also shows signs of an incipient hypercompact HII region at scales of 1 arcsec(1300 au). VLA 3 is also driving a thermal radio jet at scales of a few tenths of arcsec (fewhundred of au). We conclude that this jet is shock exciting the radio continuum sources Bcand VLA 4 (obscured Herbig?Haro objects), which show proper motions moving outwardfrom VLA 3 at velocities of ?112?118 km s?1. We have also detected three new weak radiocontinuum sources, two of them associated with millimetre continuum cores observed withALMA, suggesting that these two sources are also embedded young stellar objects in thismassive star-forming region.