Radio Continuum Sources associated with the HH~92 and HH~34 Jets

TL;DR

This study uses high-resolution radio observations to identify and analyze the sources associated with the HH~92 and HH~34 jets, revealing the exciting sources and a potential circumstellar disk.

Contribution

First high-resolution radio imaging of HH~92 and HH~34 jets, identifying exciting sources and a circumstellar disk candidate.

Findings

VLA 1 is the likely exciting source of HH~92 outflow.

Detected a circumstellar disk around HH~34's source.

Identified three compact sources near HH~92.

Abstract

We present high angular resolution, high sensitivity 8.46 GHz (3.6 cm) radio continuum observations made toward the core of the HH~92 outflow with the Very Large Array in 2002-2003 and with the Expanded Very Large Array in 2011. We detect a group of three compact sources distributed in a region 2$''$ in extension and discuss their nature. We conclude that one of the objects (VLA 1) is the exciting source of the giant outflow associated with HH~92. In the case of HH~34 we present new 43.3 GHz (7 mm) observations that reveal the presence of a structure associated with the exciting source and elongated perpendicular to the highly collimated optical jet in the region. We propose that this 7 mm source is a circumstellar disk with radius of $\sim$80 AU and mass of $\sim$0.21 $M_\odot$.