Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)
Journal article, 2020
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 Very Large Array (VLA) data and Atacama Large Millimeter Array (ALMA) archive data at 1.3 mm wavelength. We find that VLA 1 is driving a thermal radio jet at scales of approximate to 0.1 arcsec (approximate to 130 au), but also shows signs of an incipient hypercompact HII region at scales of less than or similar to 1 arcsec (less than or similar to 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 Herbig-Haro objects), which show proper motions moving outward from VLA 3 at velocities of approximate to 112-118 km s(-1). We have also detected three new weak radio continuum sources, two of them associated with millimetre continuum cores observed with ALMA, suggesting that these two sources are also embedded young stellar objects in this massive star-forming region.
HII regions
radio continuum: ISM
Herbig-Haro objects
ISM: jets and outflows
stars: protostars
stars: massive
Author
A. Rodriguez-Kamenetzky
Instituto de Astronomía Teórica y Experimental (IATE)
C. Carrasco-Gonzalez
Universidad Nacional Autónoma de México
J. M. Torrelles
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Spanish National Research Council (CSIC)
Wouter Vlemmings
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
L. F. Rodriguez
Universidad Nacional Autónoma de México
G. Surcis
Istituto nazionale di astrofisica (INAF)
J. F. Gomez
Spanish National Research Council (CSIC)
J. Canto
Universidad Nacional Autónoma de México
C. Goddi
Leiden University
Radboud University
J. S. Kim
Korea Astronomy and Space Science Institute
S-W Kim
Korea Astronomy and Space Science Institute
N. Anez-Lopez
Spanish National Research Council (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
S. Curiel
Universidad Nacional Autónoma de México
H. J. van Langevelde
Joint Institute for VLBI in Europe (JIVE)
Leiden University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 496 3 3128-3141Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Geophysics
Geosciences, Multidisciplinary
DOI
10.1093/mnras/staa1742