Properties and Keplerian Rotation of the Hot Core IRAS 20126+4104

TL;DR

This study uses SMA observations to analyze the hot core IRAS 20126+4104, revealing molecular compositions, a hot core, and Keplerian disk rotation, including the first detection of H2CO tracing disk rotation.

Contribution

First detection of H2CO tracing disk rotation and detailed characterization of the hot core IRAS 20126+4104 using molecular line observations.

Findings

Hot core coincides with IRAS 20126+4104.

Keplerian rotation observed in H2CO and HC3N lines.

H2CO traces disk rotation for the first time.

Abstract

We present Submillimeter Array observations of the massive star-forming region IRAS 20126+4104 in the millimeter continuum and in several molecular line transitions. With the SMA data, we have detected nine molecular transitions, including DCN, CH3OH, H2CO, and HC3N molecules, and imaged each molecular line. From the 1.3 mm continuum emission a compact millimeter source is revealed, which is also associated with H2O, OH, and CH3OH masers. Using a rotation temperature diagram (RTD), we derive that the rotational temperature and the column density of CH3OH are 200 K and 3.7\times 1017 cm-2, respectively. The calculated results and analysis further indicate that a hot core coincides with IRAS 20126+4104. The position-velocity diagrams of H2CO 3(0,3)-2(0,2) and HC3N 25-24 clearly present Keplerian rotation. Moreover, H2CO 3(0,3)-2(0,2) is found to trace the disk rotation for the first time.