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

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 pha...

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Bibliographic Details
Published in:Galaxies 2023-02, Vol.11 (1), p.3
Main Authors: Jiang, Wu, Zhao, Guang-Yao, Shen, Zhi-Qiang, Rioja, María J., Dodson, Richard, Cho, Ilje, Zhao, Shan-Shan, Eubanks, Marshall, Lu, Ru-Sen
Format: Article
Language:English
Subjects:
Accretion disks
Antennas
Astrometry
black hole
Event horizon
ngEHT
Phase coherence
Radio astronomy
SFPR
Signal to noise ratio
Simulation
Telescope
Telescopes
Very long baseline interferometry
VLBI
Wavelengths
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Summary: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.
ISSN:2075-4434
2075-4434
DOI:10.3390/galaxies11010003