Product catalogue
Astrometric Apparent Motion of High-redshift Radio Sources
Radio-loud quasars at high redshift (z ≥ 4) are rare objects in the universe and rarely observed with Very Long Baseline Interferometry (VLBI). But some of them have flux density sufficiently high for monitoring of their apparent position. The instability of the astrometric positions could be linked to the astrophysical process in the jetted active galactic nuclei in the early universe. Regular observations of the high-redshift quasars are used for estimating their apparent proper motion over several years. We have undertaken regular VLBI observations of several high-redshift quasars at 2.3 GHz (S band) and 8.4 GHz (X band) with a network of five radio telescopes: 40 m Yebes (Spain), 25 m Sheshan (China), and three 32 m telescopes of the Quasar VLBI Network (Russia)—Svetloe, Zelenchukskaya, and Badary. Additional facilities joined this network occasionally. The sources have also been observed in three sessions with the European VLBI Network in 2018–2019 and one Long Baseline Array experiment in 2018. In addition, several experiments conducted with the Very Long Baseline Array in 2017–2018 were used to improve the time sampling and the statistics. Based on these 37 astrometric VLBI experiments between 2017 and 2021, we estimated the apparent proper motions of four quasars: 0901+697, 1428+422, 1508+572, and 2101+600.
Citation: Oleg Titov <i>et al </i>2023 <i>AJ</i><b> 165</b> 69
Simple
Identification info
- Date (Creation)
- 2022-12-16T20:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147596
- Cited responsible party
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Role Organisation / Individual Name Details Author Titov, O.
Internal Contact Author Frey, S.
External Contact Author Melnikov, A.
External Contact Author Shu, F.
External Contact Author Xia, B.
External Contact Author Gonzalez, J.
External Contact Author Tercero, B.
External Contact Author Gurvits, L.
External Contact Author de Witt, A.
External Contact Author McCallum, J.
External Contact Author Kharinov, M.
External Contact Author Zimovsky, V.
External Contact Author Krezinger, M.
External Contact Publisher American Astronomical Society
External Contact
- Name
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The Astronomical Journal
- Issue identification
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Volume 165 Number 2
- Purpose
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Article written for submission to 'The Astronomical Journal'
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Space Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Titov, O.
Internal Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Project
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Very Long Baseline Interferometry - VLBI
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- Project
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geodesy
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- Project
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International Celestial Reference System - ICRF
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- Keywords
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Radiometrics
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- Keywords
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Foundation Spatial Data Framework
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- theme.ANZRC Fields of Research.rdf
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Earth system sciences
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Resource constraints
- Title
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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Licence
- Alternate title
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CC-BY-NC-SA
- Edition
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4.0
- Addressee
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Role Organisation / Individual Name Details User Any
- Use constraints
- License
- Use constraints
- Other restrictions
- Other constraints
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© 2023. The Author(s)
Resource constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Classification system
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Australian Government Security Classification System
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Link to Journal Article
Link to Journal Article
- Distribution format
-
Resource lineage
- Statement
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Article written for submission to 'The Astronomical Journal'
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/0648e736-2dd1-4932-82bd-065c0b815f41
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Titov, O.
Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Journal Article / Conference Paper
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/147596
- Date info (Creation)
- 2023-02-08T01:33:39
- Date info (Revision)
- 2023-02-08T01:33:39
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551