Browsing by Subject "Masers"
Now showing items 1-10 of 17
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Annual parallax and galactic orbit of Y Librae (IRAS 15090−0549) Mira variable star-GALORB release
(Oxford Univ Press, 2019)Using the VLBI Exploration of Radio Astrometry (VERA), we measured the trigonometric parallax of an H2O maser source in a variable star of Mira Cet type, Y Lib, to be 0.855 ± 0.050 mas, corresponding to a distance of 1.17 ... -
Bow shocks in a newly discovered maser source in IRAS 20231+3440
(Oxford Univ Press, 2017)From measuring the annual parallax of water masers over 1.5 yr with VLBI Exploration of Radio Astrometry, we present the trigonometric parallax and corresponding distance of another newly identified water maser source ... -
Detection of new methanol maser transitions associated with G358.93−0.03
(Oxford Univ Press, 2019)We report the detection of new 12.178, 12.229, 20.347, and 23.121 GHz methanol masers in the massive star-forming region G358.93−0.03, which are flaring on similarly short time-scales (days) as the 6.668 GHz methanol masers ... -
Discovery of periodic class II methanol masers associated with G339.986−0.425 region
(Oxford Univ Press, 2016)10 new class II methanol masers from the 6.7-GHz Methanol Multibeam survey catalogues III and IV were selected for a monitoring programme at both 6.7 and 12.2 GHz with the 26-m Hartebeesthoek Radio Astronomy Observatory ... -
The extraordinary outburst in the massive protostellar system NGC 6334I-MM1: flaring of the water masers in a north-south bipolar outflow driven by MM1B
(IOP Publishing, 2018)We compare multi-epoch sub-arcsecond Very Large Array imaging of the 22 GHz water masers toward the massive protocluster NGC 6334I observed before and after the recent outburst of MM1B in (sub)millimeter continuum. Since ... -
An investigation into maser variability in high-mass star forming regions
(North-West University, 2018)The two brightest class II methanol masers - at 6.7- and 12.2-GHz, are exclusively associated with the early phases of high-mass star formation. This implies that studying these maser species is an indirect probe of the ... -
A masing event in NGC 6334I: contemporaneous flaring of hydroxyl, methanol, and water masers
(Oxford Univ Press, 2018)As a product of the maser monitoring program with the 26 m telescope of the Hartebeesthoek Radio Astronomy Observatory (HartRAO), we present an unprecedented, contemporaneous flaring event of 10 maser transitions in hydroxyl, ... -
Periodic methanol masers in G9.62+0.20E (Research note)
(EDP Sciences, 2016)A number of mechanisms for understanding the periodic class II methanol masers associated with some high-mass star forming regions have been proposed in the past. Two recent proposals by Parfenov & Sobolev (2014, MNRAS, ... -
Periodic methanol masers: from a colliding wind binary (CWB) perspective
(Oxford Univ Press, 2019)Since the discovery of periodic class II methanol masers at 6.7 and 12.2 GHz associated with high-mass star formation regions (HMSFRs), a number of possible driving mechanisms have been proposed to explain this phenomenon. ... -
Periodic variability of the mainline hydroxyl masers in G9.62+0.20E
(Oxford Univ Press, 2019)We present the results of a monitoring campaign using the KAT-7 and HartRAO 26 m telescopes, of hydroxyl, methanol, and water vapour masers associated with the high-mass star-forming region G9.62+0.20E. Periodic flaring ...