Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724511m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #245.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present recent results from a survey of all known OH megamasers accessible to the Arecibo 300-m telescope. The survey is an extension of the work presented in Robishaw, Quataert, and Heiles (2008), measuring all four Stokes parameters for the main OH maser lines at 1667 and 1665 MHz and the satellite lines at 1612 and 1720 MHz. We compare the original observations of the sources presented in Robishaw et al. to reobservations of the same sources a few years later, and discuss evidence for variability. The linear polarization data may be used to place limits on and in some cases measure the Faraday rotation for the continuum synchrotron emission. We use the circular polarization data to measure the Zeeman splitting of maser lines. The Zeeman splitting is then used to measure the magnetic field in the masing regions. We connect the measured magnetic fields with the large scale properties of the Luminous Infrared Galaxies that play host to OH megamasers. Support for this work was provided in part by NSF grant AST-0908572.
Heiles Carl
McBride James
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