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2011MNRAS.411.2059C - Mon. Not. R. Astron. Soc., 411, 2059-2066 (2011/March-1)
Blueshifted outflow from 24.329+0.145.
CASWELL J.L. and GREEN J.A.
Abstract (from CDS):
The 1667-MHz OH emission extends over more than 20 km/s, and our demonstrated association with the methanol maser reveals that this is offset from the systemic velocity by as much as 50 km/s. The implied energetic blueshifted outflow is unprecedented in OH masers of this class. Our spectral studies using the ATCA, with a new high-resolution spectrometer, achieve full polarization observations of the 1665- and 1667-MHz OH ground-state transitions. The dominance of 1667-MHz emission, with no detection at 1665 MHz, suggests unusual physical properties in the ouflow region. Likewise, the prevalence of linear polarization may be a consequence of emission arising in a fast-moving outflow, with perhaps a link between linear polarization orientation and outflow orientation.
We also present new observations of maser sites 24.494-0.039 and 24.790+0.083. These close neighbours of 24.329+0.145, with methanol maser emission at a similar systemic velocity, are also accompanied by masers of water and OH, but have no unusual maser properties. The velocity and Galactic longitude of all three sites, and of the H II complex W42, correspond to an especially interesting Galactic location near the tangent point of the 3-kpc arm (expanding ring), at a distance of 7.7 kpc.
Abstract Copyright: 2010 The Author Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): masers - stars: formation - H {sc ii} regions - ISM: molecules - Galaxy: kinematics and dynamics - radio lines: ISM
Simbad objects: 4
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