Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812918a&link_type=abstract
American Astronomical Society, AAS Meeting #218, #129.18; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We report the discovery of 6.035 GHz hydroxyl (OH) maser flares toward the massive young stellar object IRAS 18566+0408, 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 the other in September to November 2009. The 6.035 GHz OH flares are not simultaneous with the H2CO flares; the peak of the OH flares appears to be delayed by 1 to 3 months with respect to the formaldehyde flares. On the other hand, the OH flares occurred simultaneously with CH3OH flares from maser components that have approximately the same LSR velocity as the OH. The correlated variability of OH and CH3OH masers in IRAS 18566+0408 supports a common excitation mechanism (IR pumping) as predicted by theory. EA acknowledges support from the WIU OSP. PH acknowledges partial support from NSF grant AST-0908901.
Araya Esteban
Hofner Peter
Kurtz Stan
Linz Hendrik
Marzouk A. Al A.
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