Product catalogue
Effect of asymmetry of the radio source distribution on the apparent proper motion kinematic analysis
Information on physical characteristics of astrometric radio sources, such as magnitude and redshift, is of great importance for many astronomical studies. However, data usually used in radio astrometry is often incomplete and outdated.
Our purpose is to study the optical characteristics of more than 4000 radio sources observed by the astrometric VLBI technique since 1979. We also studied the effect of the asymmetry in the distribution of the reference radio sources on the correlation matrices between vector spherical harmonics of the first and second degrees.
Methods. The radio source characteristics were mainly taken from the NASA/IPAC Extragalactic Database (NED). Characteristics of the gravitational lenses were checked with the CfA-Arizona Space Telescope LEns Survey. SIMBAD and HyperLeda databases were also used to clarify the characteristics of some objects. Also we simulated and investigated a list of 4000 radio sources evenly distributed around the celestial sphere. We estimated the correlation matrices between the vector spherical harmonics using the real as well as modelled distribution of the radio sources.
Results. A new list OCARS (optical characteristics of astrometric radio sources) of 4261 sources has been compiled. Comparison of our data of optical characteristics with the official International Earth Rotation and Reference Systems Service (IERS) list showed significant discrepancies for about half of the 667 common sources. Finally, we found that asymmetry in the radio source distribution between hemispheres could cause significant correlation between the vector spherical harmonics, especially in the case of sparse distribution of the sources with high redshift. We also identified radio sources having a many-year observation history and lack of redshift. These sources should be urgently observed with large optical telescopes.
The list of optical characteristics created in this paper is recommended for use as a supplementary material for the next international celestial reference frame (ICRF) realization. It can be also effectively used for cosmological studies and planning of observing programs both in radio and optical wavelength.
<b>Citation:</b> Titov, O., & Malkin, Z. (2009). Effect of asymmetry of the radio source distribution on the apparent proper motion kinematic analysis. Astronomy & Astrophysics, 506(3), 1477–1485.
Simple
Identification info
- Date (Publication)
- 2009-09-03T00:00:00
- Date (Creation)
- 2009-05-14
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/68956
- Cited responsible party
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Role Organisation / Individual Name Details Author Titov, O.
1 Author Malkin, Z.
External Contact
- Name
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Astronomy & Astrophysics
- Issue identification
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Volume 506, Number 3
- Page
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1477-1485
- 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 Hall, L.
Space Division Internal Contact
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- Unknown
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
- Keywords
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Advice
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astrometry
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interferometric
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- Theme
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geodesy
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
- Other constraints
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© ESO 2009
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- OnLine resource
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Link to journal article
Link to journal article
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor EDP Sciences
Resource lineage
- Statement
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Published in the Astronomy & Astrophysics journal.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/a05f7892-eb6a-7506-e044-00144fdd4fa6
- Title
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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 Hall, L.
Space Division 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/68956
- Date info (Creation)
- 2025-07-29T23:21:03.283Z
- Date info (Creation)
- 2025-07-25T05:26:33.536Z
- Date info (Creation)
- 2025-07-25T05:25:49.707Z
- Date info (Revision)
- 2025-07-29T23:22:02.295Z
- Date info (Creation)
- 2009-05-14T00:00:00
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