<div class="csl-bib-body">
<div class="csl-entry">de Witt, A., Basu, S., Charlot, P., Gordon, D., Jacobs, C., Johnson, M., Krasna, H., Le Bail, K., Shu, F., Titov, O., & Schartner, M. (2021, March 16). <i>Improving the S/X Celestial Reference Frame in the South: A Status Update</i> [Conference Presentation]. 25th European VLBI Group for Geodesy and Astronomy Working Meeting, Cyberspace, Unknown. http://hdl.handle.net/20.500.12708/135945</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/135945
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dc.description.abstract
Catalogues of positions of compact extragalactic radio sources, including the ICRF-3, are generally weaker in the south by factors of 2 or more in both density and precision. In 2018 we started a campaign to improve the S/X celestial reference frame in the south by upgrading existing IVS astrometric observing programmes. Our efforts were mainly focused on the Celestial Reference Frame (CRF) and Celestial Reference Frame Deep South (CRDS) sessions, which are dedicated astrometric observing programmes of sources at mid- and southern declinations. In particular, the data rate of the CRF and CRDS sessions were increased from 256 Mbps to 1 Gbps and the pool of sources were
increased by a factor of two. The scheduling was also optimised to allow for simultaneous astrometric and imaging observations, and the CRF network was revised for improved uv-coverage. We provide details of our efforts, to date, to improve both the density and precision of the southern celestial reference frame, as well as our efforts to map and monitor the sources to quantify non-point-like structure and measure jet directions. We also discuss planned changes and upgrades, noting
that the Australian 12-m telescopes are transitioning to broadband and may not be available for S/X astrometric observing in future. We also present the ideas and role of the newly-established IVS-CRF committee to improve the celestial reference frame in the south.
en
dc.language.iso
en
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dc.subject
Astrometry
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dc.subject
VLBI
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dc.subject
Celestial Reference Frame
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dc.subject
Southern Hemisphere
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dc.subject
quasars
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dc.title
Improving the S/X Celestial Reference Frame in the South: A Status Update
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
SARAO, South Africa
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dc.contributor.affiliation
SARAO, South Africa
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dc.contributor.affiliation
University of Bordeaux, France
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dc.contributor.affiliation
United States Naval Observatory, United States of America (the)
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dc.contributor.affiliation
Jet Propulsion Laboratory, United States of America (the)
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dc.contributor.affiliation
United States Naval Observatory, United States of America (the)
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dc.contributor.affiliation
Chalmers University of Technology, Sweden
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dc.contributor.affiliation
SHAO, China
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dc.contributor.affiliation
Geoscience, Australia
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dc.contributor.affiliation
ETH Zurich, Switzerland
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dc.type.category
Conference Presentation
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tuw.researchTopic.id
C4
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tuw.researchTopic.id
X1
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tuw.researchTopic.id
C5
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tuw.researchTopic.name
Mathematical and Algorithmic Foundations
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tuw.researchTopic.name
Beyond TUW-research foci
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tuw.researchTopic.name
Computer Science Foundations
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tuw.researchTopic.value
20
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tuw.researchTopic.value
60
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tuw.researchTopic.value
20
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tuw.publication.orgunit
E120-04 - Forschungsbereich Höhere Geodäsie
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tuw.author.orcid
0000-0001-8660-649X
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tuw.event.name
25th European VLBI Group for Geodesy and Astronomy Working Meeting
