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SUMMARY:Imaging VGOS observations and modeling source structure effects
DTSTART;VALUE=DATE-TIME:20240905T123000Z
DTEND;VALUE=DATE-TIME:20240905T124500Z
DTSTAMP;VALUE=DATE-TIME:20260422T170603Z
UID:indico-contribution-87@cern.ch
DESCRIPTION:Speakers: Dr. XU\, Ming Hui (GFZ)\nThe new generation of geode
 tic Very Long Baseline Interferometry (VLBI)\, VLBI Global Observing Syste
 m (VGOS)\, is now regularly observing to produce the best geodetic VLBI da
 ta\, with a thermal noise level of about 3 ps. It now approaches to the de
 signed observing strategy\, i.e.\, scan lengths of on average 10 seconds a
 nd switching time of about 20 seconds. However\, the systematic errors due
  to the angular structure of the radio sources are becoming prominent in t
 hese high-precision VGOS observations. It is important to understand\, stu
 dy\, and monitor these systematic errors. Project Astrogeodesy (also a new
  research group at the GFZ)\, funded by European Research Council\, aims t
 o developing a data processing/calibrating pipeline to model these systema
 tic errors. Improvements have been made to derive images of the source str
 ucture -- and subsequently model it with a small number of Gaussian compon
 ents -- through closure imaging at the four bands (3 -- 14 GHz) directly f
 rom VGOS observations on a regular basis. We will report on our imaging re
 sults and the current research activities about source structure in VGOS o
 bservations.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/371/session/
 15/contribution/87
LOCATION:CJD Bonn Castell
URL:https://events.mpifr-bonn.mpg.de/indico/event/371/session/15/contribut
 ion/87
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