The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). III. Extended Radio Emission from Protostars in Perseus
{\L}ukasz Tychoniec, John J. Tobin, Agata Karska, Claire Chandler,, Michael M. Dunham, Zhi-Yun Li, Leslie W. Looney, Dominique Segura-Cox, Robert, J. Harris, Carl Melis, and Sarah I. Sadavoy

TL;DR
This study uses high-resolution radio observations of Perseus protostars to analyze extended emission, revealing free-free and synchrotron emission in jets, which informs understanding of protostellar outflows and disk chemistry.
Contribution
It provides detailed spectral index analysis of protostellar jets, identifying synchrotron emission and jet misalignments, advancing knowledge of outflow mechanisms.
Findings
Spectral indices indicate free-free thermal emission in protostellar jets.
Detection of synchrotron emission suggests high-energy electrons are produced near disks.
Some jets are misaligned, implying complex outflow structures.
Abstract
Centimeter continuum emission from protostars offers insight into the innermost part of the outflows, as shock-ionized gas produces free-free emission. We observed a complete population of Class 0 and I protostars in the Perseus molecular cloud at 4.1 cm and 6.4 cm with resolution and sensitivity superior to previous surveys. From a total of 71 detections, 8 sources exhibit resolved emission at 4.1 cm and/or 6.4 cm. In this paper we focus on this sub-sample, analyzing their spectral indices along the jet, and their alignment with respect to the large-scale molecular outflow. Spectral indices for fluxes integrated toward the position of the protostar are consistent with free-free thermal emission. The value of the spectral index along a radio jet decreases with distance from the protostar. For six sources, emission is well aligned with the outflow central axis, showing that we observe…
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