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Unusual shock-excited OH maser emission in a young Planetary Nebula


Qiao, H-H and Walsh, AJ and Gomez, JF and Imai, H and Green, JA and Dawson, JR and Shen, Z-Q and Ellingsen, SP and Breen, SL and Jones, PA and Gibson, SJ and Cunningham, MR, Unusual shock-excited OH maser emission in a young Planetary Nebula, The Astrophysical Journal, 817, (1) Article 37. ISSN 0004-637X (2016) [Refereed Article]


Copyright Statement

2016. The American Astronomical Society. All rights reserved.

DOI: doi:10.3847/0004-637X/817/1/37


We report on OH maser emission toward G336.644−0.695 (IRAS 16333−4807), which is a H2O maser-emitting Planetary Nebula (PN). We have detected 1612, 1667, and 1720 MHz OH masers at two epochs using the Australia Telescope Compact Array, hereby confirming it as the seventh known case of an OH-maser-emitting PN. This is only the second known PN showing 1720 MHz OH masers after K 3−35 and the only evolved stellar object with 1720 MHz OH masers as the strongest transition. This PN is one of a group of very young PNe. The 1612 MHz and 1667 MHz masers are at a similar velocity to the 22 GHz H2O masers, whereas the 1720 MHz masers show a variable spectrum, with several components spread over a higher velocity range (up to 36 km s−1). We also detect Zeeman splitting in the 1720 MHz transition at two epochs (with field strengths of ~2 to ~10 mG), which suggests the OH emission at 1720 MHz is formed in a magnetized environment. These 1720 MHz OH masers may trace short-lived equatorial ejections during the formation of the PN.

Item Details

Item Type:Refereed Article
Keywords:masers, planetary nebulae: general, planetary nebulae: individual (IRAS 163334807)
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:107757
Year Published:2016
Web of Science® Times Cited:5
Deposited By:Mathematics and Physics
Deposited On:2016-03-23
Last Modified:2017-11-03
Downloads:272 View Download Statistics

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