Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408

Details Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408 Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408

2010-06-10

arxiv.org/abs/1006.2164v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

16 pages, 3 figures, accepted for publication in the Astrophysical Journal Letters

Scientific paper

We report results of an extensive observational campaign of the 6 cm formaldehyde maser in the young massive stellar object IRAS18566+0408 (G37.55+0.20) conducted from 2002 to 2009. Using Arecibo, VLA, and GBT, we discovered quasi-periodic formaldehyde flares (P ~ 237 days). Based on Arecibo observations, we also discovered correlated variability between formaldehyde (H2CO) and methanol (CH3OH) masers. The H2CO and CH3OH masers are not spatially coincident, as demonstrated by different line velocities and high angular resolution MERLIN observations. The flares could be caused by variations in the infrared radiation field, possibly modulated by periodic accretion onto a young binary system.

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