OH Masers at Very High Spectral Resolution

Details OH Masers at Very High Spectral Resolution OH Masers at Very High Spectral Resolution

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4920f&link_type=abstract

American Astronomical Society Meeting 208, #49.20; Bulletin of the American Astronomical Society, Vol. 38, p.128

Astronomy and Astrophysics

Astronomy

Scientific paper

We present VLBA observations of the ground-state hydroxyl masers in W3(OH) at a spectral resolution of 0.02 km s-1. We find no evidence of σ±2,3 components in the satellite-line 1612 and 1720 MHz OH transitions. Use of the standard Zeeman splitting coefficient appropriate for σ±1 components to derive magnetic field strengths appears well justified. Line profiles are generally Gaussian or a combination of several Gaussians, with small normalized deviations from Gaussianity comparable to values obtained in other maser species observed with sufficiently high spectral resolution. The FWHM line widths of ground-state masers range from 0.15 to 0.38 km s-1, with the upper half of this range consisting entirely of 1665 MHz masers. Pronounced positional gradients are seen as a function of LSR velocity. Consistent with theoretical models, equivalent velocity gradients are found to be small for 1667 MHz masers.The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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