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Contribution of X/Ka VLBI to multi-wavelength celestial frame studies

Show simple item record Jacobs, C. S. Clark, J. E. Garcia-Miro, C. Horiuchi, S. Sotuela, I. 2013-07-22T14:33:36Z 2013-07-22T14:33:36Z 2011-09-19
dc.identifier.citation Journees 2011 Systemes de Reference Spatio-temporels (JSR2011): Earth Rotation, Reference Systems and Celestial Mechanics, Vienna, Austria, September 16-19, 2011 en_US
dc.identifier.clearanceno 11-5661
dc.description.abstract This paper is an update of Sotuela et al. (2011) which improves their simulated Gaia frame tie precision by ~10% by adding three additional VLBI observing sessions. Astrometry at X/Ka-band (8.4/32 GHz) using NASAs Deep Space Network has detected 466 quassars with accuracies of 200-300 μas. A program is underway to reduce errors by a factor of 2-3. From our sample, 245 sources have optical magnitudes V < 20 and should also be detectable by Gaia. A covariance study using existing X/Ka data and simulated Gaia uncertainties for the 345 objects yields a frame tie precision of 10-15 μas (1-σ)/ The characterization of wavelength dependent systematic from extended source morphology and core shift should benefit greatly from adding X/Ka-band measurements to S/X-band (2.3/8.4 GHz) measurements thus helping to constrain astrophysical models of the wavelength dependence of positions. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011. en_US
dc.subject reference systems en_US
dc.subject catalogs en_US
dc.subject astronomy en_US
dc.subject interferometry en_US
dc.subject radio continuum en_US
dc.subject Ka-band en_US
dc.subject galaxies en_US
dc.title Contribution of X/Ka VLBI to multi-wavelength celestial frame studies en_US
dc.type Preprint en_US

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