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2011MNRAS.414.1914C - Mon. Not. R. Astron. Soc., 414, 1914-1926 (2011/July-1)
Magnetic fields from OH maser maps at 6035 and 6030 MHz at galactic sites 351.417+0.645 and 353.410-0.360.
CASWELL J.L., KRAMER B.H. and REYNOLDS J.E.
Abstract (from CDS):
Towards 351.417+0.645, positions and velocities were measured for 56 discrete maser spots. Remarkably, all of these are components of Zeeman pairs, with 6035-MHz pairs at 23 distinct locations, five of which show matching 6030-MHz pairs. Strikingly, at 14 southerly locations the magnetic field is typically -5 mG (towards us), whereas seven of the northerly locations show a magnetic field of opposite sign, of up to +6.4 mG. The velocity field spanning -11.2 to -5 km/s shows no simple pattern.
Maser emission towards 353.410-0.360 is confined to half an arcsecond total extent, comprising 24 maser spots, most of them members of nine Zeeman pairs. Derived magnetic fields are all negative, three between -4.8 and -10.6 mG and three much weaker fields between 0 and -1.6 mG. There is no simple pattern in the velocity field.
OH masers at the 1665- and 1720-MHz transitions, and prominent ultracompact H II regions, are present at both 351.417+0.645 and 353.410-0.360. They are accompanied by methanol maser emission at the 6668-MHz, 12-GHz, and 107-GHz transitions. Masers at the 1667-MHz transition of OH and at the 22-GHz transition of water are found towards 351.417+0.645, but not towards 353.410-0.360. The magnetic fields of both sites are in accord with tracing an ordered Galactic magnetic field.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): magnetic fields - masers - stars: formation - H {sc ii} regions - ISM: molecules - radio lines: ISM
Simbad objects: 10
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