Measuring Accelerations in Water Vapor Megamasers using the Hough Transform

Details Measuring Accelerations in Water Vapor Megamasers using the Hough Transform Measuring Accelerations in Water Vapor Megamasers using the Hough Transform

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914918s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.18; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Circumnuclear water vapor megamasers in AGN can be used to determine distances to the host galaxies. The distance measurement technique combines an analysis of the rotation curve from VLBI data and a determination of the centripetal acceleration of systemic maser features available from monitoring. Here we present an unbiased method for measuring accelerations, based on the Hough transform. Our method involves first identifying the doppler velocities of individual spectral components at each epoch using either a local maximum algorithm or a gaussian component analysis. Next we search for secular drifts in the velocities using a tailored formulation of the Hough transform. We demonstrate the technique using both synthetic data and GBT monitoring data. This research was completed during a NSF Research Experience for Undergraduates.

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