Multiwavelength investigation of extended green object G19.88-0.53: Revealing a protocluster

TL;DR

This study uses multiwavelength observations to reveal that the extended green object G19.88-0.53 is a protocluster hosting various high-mass star formation stages, including hot cores, outflows, and UCHII regions.

Contribution

It provides the first detailed multiwavelength analysis confirming G19.88-0.53 as a protocluster with diverse star-forming components, advancing understanding of high-mass star formation.

Findings

G19.88-0.53 hosts a protocluster with multiple star-forming stages.

Detection of an ionized thermal jet associated with a dense core.

Identification of diverse gas kinematics indicating active high-mass star formation.

Abstract

A multiwavelength analysis of star formation associated with the extended green object, G19.88-0.53 is presented in this paper. With multiple detected radio and millimetre components, G19.88-0.53 unveils as harbouring a protocluster rather than a single massive young stellar object. We detect an ionized thermal jet using the upgraded Giant Meterwave Radio Telescope, India, which is found to be associated with a massive, dense and hot ALMA 2.7 mm core driving a bipolar CO outflow. Near-infrared spectroscopy with UKIRT-UIST shows the presence of multiple shock-excited H2 lines concurrent with the nature of this region. Detailed investigation of the gas kinematics using ALMA data reveals G19.88-0.53 as an active protocluster with high-mass star forming components spanning a wide evolutionary spectrum from hot cores in accretion phase to cores driving multiple outflows to possible UCHII regions.