Applications of the Source-Frequency Phase-Referencing Technique for ngEHT Observations

Wu Jiang; Guang Yao Zhao; Zhi Qiang Shen; María J. Rioja; Richard Dodson; Ilje Cho; Shan Shan Zhao; Marshall Eubanks; Ru Sen Lu

doi:10.3390/galaxies11010003

Applications of the Source-Frequency Phase-Referencing Technique for ngEHT Observations

Wu Jiang, Guang Yao Zhao, Zhi Qiang Shen, María J. Rioja, Richard Dodson, Ilje Cho, Shan Shan Zhao, Marshall Eubanks, Ru Sen Lu

International Centre for Radio Astronomy Research (ICRAR)

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

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.

Original language	English
Article number	3
Journal	Galaxies
Volume	11
Issue number	1
DOIs	https://doi.org/10.3390/galaxies11010003
Publication status	Published - Feb 2023

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10.3390/galaxies11010003Licence: CC BY

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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.",

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AU - Jiang, Wu

AU - Zhao, Guang Yao

AU - Shen, Zhi Qiang

AU - Rioja, María J.

AU - Dodson, Richard

AU - Cho, Ilje

AU - Zhao, Shan Shan

AU - Eubanks, Marshall

AU - Lu, Ru Sen

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Applications of the Source-Frequency Phase-Referencing Technique for ngEHT Observations

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