Abstract
The source-frequency phase-referencing (SFPR) technique has been demonstrated to have great advantages for mm-VLBI observations. By implementing simultaneous multi-frequency receiving systems on the next-generation Event Horizon Telescope (ngEHT) antennas, it is feasible to carry out a frequency phase transfer (FPT) which could calibrate the non-dispersive propagation errors and significantly increase the phase coherence in the visibility data. Such an increase offers an efficient approach for a weak source or structure detection. The SFPR also makes it possible for high-precision astrometry, including the core-shift measurements up to sub-mm wavelengths for Sgr A*, M 87*, etc. We also briefly discuss the technical and scheduling considerations for future SFPR observations with the ngEHT.
Funder
National Natural Science Foundation of China
Key Research Program of Frontier Sciences, CAS
Shanghai Pilot Program for Basic Research—Chinese Academy of Science, Shanghai Branch
the Spanish Ministerio de Economía y Competitividad
the Consejería de Economía, Conocimiento, Empresas y Universidad of the Junta de Andalucía
the Consejo Superior de Investigaciones Científicas
the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa”
Subject
Astronomy and Astrophysics
Cited by
5 articles.
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