Evidence of the Gaia–VLBI position differences being related to radio source structure

dc.contributor.authorXu, Ming H.
dc.contributor.authorLunz, Susanne
dc.contributor.authorAnderson, James M.
dc.contributor.authorSavolainen, Tuomas
dc.contributor.authorZubko, Nataliya
dc.contributor.authorSchuh, Harald
dc.date.accessioned2021-04-13T08:43:35Z
dc.date.available2021-04-13T08:43:35Z
dc.date.issued2021-04-02
dc.description.abstractContext. We report the relationship between the Gaia–VLBI position differences and the magnitudes of source structure effects in VLBI observations. Aims. Because the Gaia–VLBI position differences are statistically significant for a considerable number of common sources, we discuss and attempt to explain these position differences based on VLBI observations and available source images at centimeter wavelengths. Methods. Based on the derived closure amplitude root mean square (CARMS), which quantifies the magnitudes of source structure effects in the VLBI observations used for building the third realization of the International Celestial Reference Frame, the arc lengths and normalized arc lengths of the position differences are examined in detail. The radio-jet directions and the directions of the Gaia–VLBI position differences are investigated for a small sample of sources. Results. Both the arc lengths and normalized arc lengths of the Gaia and VLBI positions are found to increase with the CARMS values. The majority of the sources with statistically significant position differences are associated with the sources having extended structure. Radio source structure is the one of the major factors of these position differences, and it can be the dominant factor for a number of sources. The vectors of the Gaia and VLBI position differences are parallel to the radio-jet directions, which is confirmed via stronger evidence.en
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/13016
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-11811
dc.language.isoenen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.ddc520 Astronomie und zugeordnete Wissenschaftende
dc.subject.othergalaxiesen
dc.subject.otherjetsen
dc.subject.otherastrometryen
dc.subject.otherreference systemsen
dc.subject.otherradio continuumen
dc.titleEvidence of the Gaia–VLBI position differences being related to radio source structureen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumberA189en
dcterms.bibliographicCitation.doi10.1051/0004-6361/202040168en
dcterms.bibliographicCitation.journaltitleAstronomy and Astrophysicsen
dcterms.bibliographicCitation.originalpublishernameEDP Sciencesen
dcterms.bibliographicCitation.originalpublisherplaceLes Ulisen
dcterms.bibliographicCitation.volume647en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Geodäsie und Geoinformationstechnik::FG Satellitengeodäsiede
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Satellitengeodäsiede
tub.affiliation.instituteInst. Geodäsie und Geoinformationstechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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