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The ngVLA Band-4 Water Vapor Radiometry Concept
Tirupati Kumara Sridharan, Robert Lehmensiek, Yoshiharu Asaki
The ngVLA has adopted a standalone system with a ~1.5 m diameter antenna and associated ambient temperature receiver and electronics at each antenna as its baseline design fo…
ALMA High-frequency Long Baseline Campaign in 2021: Highest Angular Resolution Submillimeter Wave Images for the Carbon-rich Star R Lep
Yoshiharu Asaki, Luke T. Maud, Harold Francke +11
The Atacama Large Millimeter/submillimeter Array (ALMA) was used in 2021 to image the carbon-rich evolved star R Lep in Bands 8-10 (397-908 GHz) with baselines up to 16 km. The goa…
Updates to ALMA Site Properties: using the ESO-Allegro Phase RMS database -- ALMA Memo 624
Luke T. Maud, Andrés F. Pérez-Sánchez, Yoshiharu Asaki +3
We present a long-term overview of the atmospheric phase stability at the Atacama Large Millimeter/submillimeter Array (ALMA) site, using >5 years of data, that acts as the success…
The Transformational Power of Frequency Phase Transfer Methods for ngEHT
María J. Rioja, Richard Dodson, Yoshiharu Asaki
(Sub) mm VLBI observations are strongly hindered by limited sensitivity, with the fast tropospheric fluctuations being the dominant culprit. We predict great benefits from applying…
The ObsMode 2020 Process
Satoko Takahashi, Edward B. Fomalont, Yoshiharu Asaki +11
ObsMode is a yearly process which aims at preparing capabilities for future ALMA Observing cycles. The process has been running for a number of years tied to each ALMA observing cy…
ALMA High-frequency Long-baseline Campaign in 2017: A Comparison of the Band-to-band and In-band Phase Calibration Techniques and Phase-calibrator Separation Angles
Luke T. Maud, Yoshiharu Asaki, Edward B. Fomalont +9
The Atacama Large millimeter/submillimeter Array (ALMA) obtains spatial resolutions of 15 to 5 milli-arcsecond (mas) at 275-950GHz (0.87-0.32mm) with 16km baselines. Calibration at…