Discovery of 6.035GHz Hydroxyl Maser Flares in IRAS18566+0408

Abstract

We report the discovery of 6.035GHz hydroxyl (OH) maser flares toward the massive star forming region IRAS18566+0408 (G37.55+0.20), which is the only region known to show periodic formaldehyde (4.8 GHz H2CO) and methanol (6.7 GHz CH3OH) maser flares. The observations were conducted between October 2008 and January 2010 with the 305m Arecibo Telescope in Puerto Rico. We detected two flare events, one in March 2009, and one in September to November 2009. The OH maser flares are not simultaneous with the H2CO flares, but may be correlated with CH3OH flares from a component at corresponding velocities. A possible correlated variability of OH and CH3OH masers in IRAS18566+0408 is consistent with a common excitation mechanism (IR pumping) as predicted by theory.

Accepted for publication in the Astrophysical Journal

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Cited by in corpus (9)

• A Masing Event in NGC6334I: Contemporaneous Flaring of Hydroxyl, Methanol and Water Masers
• Long-term multi-frequency maser observations of the intermediate-mass young stellar object G107.298+5.639
• SMA Observations of the Hot Molecular Core IRAS 18566+0408
• Variability monitoring of the hydroxyl maser emission in G12.889+0.489
• High Resolution Observations of the Massive Protostar in IRAS18566+0408
• High-Sensitivity Observations of Molecular Lines with the Arecibo Telescope
• Long-term Variability of H${}_2$CO Masers in Star-forming Regions
• New ex-OH maser detections in the northern celestial hemisphere
• Excited Hydroxyl Outflow in the High-Mass Star-Forming Region G34.26+0.15