Unveiling a Compact Cluster of Massive and Young Stars in IRAS 17233-3606

TL;DR

This study reveals a compact cluster of massive, young stars in IRAS 17233-3606 through high-resolution radio and infrared observations, identifying nine radio sources and their potential nature as ultra-compact HII regions or dusty disks.

Contribution

First high-resolution radio analysis of IRAS 17233-3606 identifying nine compact sources, including six new detections, and linking them to young stellar objects and outflows.

Findings

Nine compact radio sources identified, six are new.

Most sources are ultra/hyper-compact HII regions.

Cluster of young protostars with collimated outflows observed.

Abstract

We have analyzed sensitive high spatial resolution archival radio continuum data at 1.3, 2.0, 3.6 and 6.0 cm as well as the H2O maser molecular line data obtained using the Very Large Array (VLA) in its hybrid AB configuration toward the high-mass star-forming region IRAS 17233-3606 (G351.78-0.54). We find nine compact radio sources associated with this region, six of them are new radio detections. We discuss the characteristics of these sources based mostly on their spectral indices and find that most of them appear to be optically thin or thick ultra- and hyper-compact HII regions ionized by B ZAMS stars. Furthermore, in a few cases the radio emission may arise from optically thick dusty disks and/or cores, however more observations at different wavelengths are necessity to firmly confirm their true nature. In addition, we compared our centimeter maps with the mid-infrared images fromthe Spitzer Space Observatory GLIMPSE survey revealing a cluster of young protostars in the region together with multiple collimated outflows some of whom might be related with the compact centimeter objects.