Discovery of Periodic Formaldehyde and Methanol Maser Flares in IRAS 18566+0408

Details Discovery of Periodic Formaldehyde and Methanol Maser Flares in IRAS 18566+0408 Discovery of Periodic Formaldehyde and Methanol Maser Flares in IRAS 18566+0408

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630904a&link_type=abstract

American Astronomical Society, AAS Meeting #216, #309.04; Bulletin of the American Astronomical Society, Vol. 41, p.872

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the discovery of (quasi)periodic formaldehyde (H2CO) maser flares from the massive star forming region IRAS 18566+0408. The periodicity of the flares is 237 days. We also discovered simultaneous methanol (CH3OH) 6.7 GHz maser flares in the region. Our data show that the H2CO and CH3OH masers are located in different parcels of gas, and that the flares are likely caused by a change in the gain of the masers. These results suggest that the H2CO and CH3OH 6.7 GHz masers in IRAS 18566+0408 have a similar pumping mechanism, most likely infrared excitation. The masers are probing some recurrent/harmonic physical phenomenon associated with massive star formation, perhaps tracing periodic accretion events in a binary system.

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