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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 358830.0, MPI für Astronomie / Publikationen_mpia
First detection of an H2CO 6 cm maser flare: a burst in IRAS 18566+0408
Authors:Araya, E.; Hofner, P.; Sewilo, M.; Linz, H.; Kurtz, S.; Olmi, L.; Watson, C.; Churchwell, E.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Volume:654
Start Page:L95
End Page:L98
Audience:Not Specified
Abstract / Description:We report the discovery of a short-duration (less than 3 months) outburst of the H2CO 6 cm maser in IRAS 18566+0408 (G37.55+0.20). During the flare, the peak flux density of the maser increased by a factor of 4; after less than a month, it decayed to the preflare value. This is the first detection of a short, burstlike variability of an H2CO 6 cm maser. The maser shows an asymmetric line profile that is consistent with the superposition of two Gaussian components. We did not detect a change in the velocity or the line width of the Gaussian components during the flare. If the two Gaussian components trace two separate maser regions, then very likely an event outside the maser gas triggered simultaneous flares at two different locations.
Free Keywords:ISM: H II Regions; ISM: individual (IRAS 18566+0408); ISM: Molecules; Masers; Radio Lines: ISM; Stars: Formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2007ApJ...654L..95A
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