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High-velocity H2O maser emission from the post-asymptotic-giant-branch star OH 009.1-04

journal contribution
posted on 2023-05-16, 23:53 authored by Walsh, AJ, Breen, SL, Bains, I, Vlemmings, WHT
Observations of H2O masers towards the post-asymptotic-giant-branch star and water fountain source OH 009.1−0.4 were made as part of The H2O southern galactic Plane Survey, with the Mopra radiotelescope. Together with followup observations using the Australia Telescope Compact Array (ATCA), we have identified H2O maser emission over a velocity spread of nearly 400 km s −1 (− 109 to +289 km s−1). This velocity spread appears to be the largest of any known maser source in our Galaxy. High-resolution observations with the ATCA indicate that the maser emission is confined to a region 0.3 × 0.3 arcsec and shows weak evidence for a separation of the red- and blueshifted maser spots. We are unable to determine if the water fountain is projected along the line of sight, or is inclined, but either way OH 009.1−0.4 is an interesting source, worthy of followup observations.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

394

Pagination

L70-L73

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Wiley-Blackwell Publishing Inc

Place of publication

Malden, USA

Rights statement

The definitive published version is available online at: http://interscience.wiley.com

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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