Optimization of Methods to Detect Periodic Structure in VLBI Data

Details Optimization of Methods to Detect Periodic Structure in VLBI Data Optimization of Methods to Detect Periodic Structure in VLBI Data

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341108r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #411.08; Bulletin of the American Astronomical Society, Vol. 41, p.217

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Observations of Sgr A* with Millimeter VLBI have the potential to detect periodic structure due to a orbiting hot spot or other mechanism. Using simulations we evaluate several methods of detecting a periodic phase signature in the closure phase of a triangle of baselines in order to find the optimum method in the case of low signal to noise ratio. The methods are also applicable to finding a periodic signature in source polarization from the phase difference between VLBI fringes in the parallel and cross hands of circular polarization on a single baseline.

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