IRAS 22198+6336: Discovery of an Intermediate-Mass Hot Core

TL;DR

This paper reports the discovery of an intermediate-mass hot core in IRAS 22198+6336, characterized by complex molecular emissions, outflows, and a hot, dense environment, expanding understanding of star formation in this mass range.

Contribution

It provides the first detailed observational evidence of an intermediate-mass hot core with molecular line analysis and outflow characterization.

Findings

Detection of a compact, hot, dense core with 5 solar masses.

Identification of quadrupolar CO outflow and associated SiO emission.

Chemically rich spectrum with temperatures of 100-150 K.

Abstract

We present new SMA and PdBI observations of the intermediate-mass object IRAS 22198+6336 in the millimeter continuum and in several molecular line transitions. The millimeter continuum emission reveals a strong and compact source with a mass of around 5 Msun and with properties of Class 0 objects. CO emission shows an outflow with a quadrupolar morphology centered on the position of the dust condensation. The CO outflow emission seems to come from two distinct outflows, one of them associated with SiO outflow emission. A large set of molecular lines has been detected toward a compact dense core clearly coincident with the compact millimeter source, and showing a velocity gradient perpendicular to the outflow traced by CO and SiO. The chemically rich spectrum and the rotational temperatures derived from CH$_3$CN and CH$_3$OH (100-150 K) indicate that IRAS 22198+6336 is harbouring one the few intermediate-mass hot cores known at present.