University Of Tasmania

File(s) under permanent embargo

High-velocity feature of the class I methanol maser in G309.38−0.13

journal contribution
posted on 2023-05-17, 03:45 authored by Voronkov, MA, Caswell, JL, Britton, TR, Green, JA, Sobolev, AM, Simon EllingsenSimon Ellingsen
The Australia Telescope Compact Array (ATCA) has been used to map class I methanol masers at 36 and 44 GHz in G309.38−0.13. Maser spots are found at nine locations in an area of 50 ~ 30 arcsec2, with both transitions reliably detected at only two locations. The brightest spot is associated with shocked gas traced by 4.5-ƒÊm emission. The data allowed us to make a serendipitous discovery of a high-velocity 36-GHz spectral feature, which is blueshifted by about 30 km s−1 from the peak velocity at this frequency, but spatially located close to (within a few arcseconds of) the brightestmaser spot.We interpret this as indicating an outflow parallel to the line of sight. Such a high-velocity spread of maser features, which has not been previously reported in the class I methanol masers associated with a single molecular cloud, suggests that the outflow most likely interacts with a moving parcel of gas.


Publication title

Monthly Notices of the Royal Astronomical Society








School of Natural Sciences


Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

The definitive published version is available online at:

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

Usage metrics

    University Of Tasmania