High velocity water maser emission from the Post-AGB star OH 009.1-0.4

Details High velocity water maser emission from the Post-AGB star OH 009.1-0.4 High velocity water maser emission from the Post-AGB star OH 009.1-0.4

2008-12-10

arxiv.org/abs/0812.1832v1

Astronomy and Astrophysics

Astrophysics

Accepted by MNRAS Lett

Scientific paper

Observations of H$_2$O masers towards the post-AGB star and water fountain source OH 009.1--0.4 were made as part of HOPS (The H$_2$O southern galactic Plane Survey), with the Mopra radiotelescope. Together with followup observations using the Australia Telescope Compact Array (ATCA), we have identified H$_2$O maser emission over a velocity spread of nearly 400km/s (--109 to +289km/s). This velocity spread appears to be the largest of any known maser source in our Galaxy. High resolution observations with the ATCA indicate the maser emission is confined to a region $0\farcs3 \times 0\farcs3$ 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.

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