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Current Results of the VERA K/Q-band Fringe Survey: Performance of the 8-Gbps Recording System and its Effectiveness

VERA (VLBI Exploration of Radio Astrometry) started a K/Q-band continuum radio source fringe survey using an 8-Gbps recording system in January 2016. The main purposes of these experiments are the establishment of analysis procedures for highly sensitive VLBI (Very Long Baseline Interferometry) data, increasing the observable radio sources for VERA, and confirming the effect on the analysis results of the reduction of white noise error. The radio sources for observation are selected from the VLBA (Very Long Baseline Array) Calibrator List; some 5,196 radio sources, which are distributed in the range of−45 to 90 degrees of Celestial declination, are listed as observable candidates. The frequency fluctuation from atmospheric refraction and the instability of phase lock oscillators are corrected by smoothing, using a Moving-Average Filter, to inhibit a decrease of the correlation coefficient during the integration period. By May 2018, 3,252 sources in K-band and 2,941 sources in Q-band were observed. When the fringe detection was realized with signal-to-noise ratios of seven or more, the number of radio sources that met the fringe detection criterion was 2,608 in K-band and 1,725 in Q-band. From the delays of the 8-Gbps recorded VLBI data, the azimuthal anomaly of residual delays (including anisotropy of atmospheric excess pass delay) was confirmed.