NAOC Open IR
Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes
Liao, Shilong1,2; Qi, Zhaoxiang1,2; Cao, Zihuang3; Tang, Zhenghong1,2
2021-02-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN0004-6280
Volume133Issue:1020Pages:9
AbstractGaia data release 2 (DR2) provides the best non-rotating optical frame aligned with the radio frame (ICRF) thanks to the inclusion of about half-million quasars in the five-parameter astrometric solution. We cross-match with Gaia DR2 the quasars from Large Quasar Astrometric Catalogue, Sloan Digital Sky Survey and LAMOST, obtaining 208,743 new sources (denominated as KQCG), and most of them are fainter than G = 19. Given their crucial diagnostic role for characterizing the properties of the celestial reference frame, we aim to probe more accurately the properties of the reference frame at the faintest magnitudes. Combining them with the quasars already identified in DR2, we estimate the moving mean of parallaxes and proper motions. The features of the proper motion are analyzed by means of vectorial spherical harmonics; the scalar field of parallaxes is expanded into spherical harmonics to investigate their spatial correlation, which reveals an angular scale of systematics of 18 degrees with a rms amplitude of 13 mu as. The global moving mean of the parallaxes and proper motions are calculated. The amplitude of proper motion bias can be up to similar to 10 mu as yr(-1) in some sky regions for both components, and these biases seem to be related to the patterns of the scanning law. The reference frame exhibits a (-6, -5, -5) 1 mu as yr(-1) spin in the northern hemisphere and a spin of (0, +1, +3) 1 mu as yr(-1) in the southern one, which may be caused by the star contamination. The quadrupolar anisotropy of the proper motion filed is analyzed, where a significant quadrupolar signal (the largest component's amplitude is up to -15 mu as yr(-1)) is found.
KeywordCatalogs Astrometry Parallax Proper motions Quasars
Funding OrganizationNational Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC)
DOI10.1088/1538-3873/abd4bd
Language英语
Funding ProjectNational Science Foundation of China (NSFC)[11703065] ; National Science Foundation of China (NSFC)[11573054] ; National Science Foundation of China (NSFC)[11503042]
Funding OrganizationNational Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000612085000001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79714
Collection中国科学院国家天文台
Corresponding AuthorLiao, Shilong
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Liao, Shilong,Qi, Zhaoxiang,Cao, Zihuang,et al. Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2021,133(1020):9.
APA Liao, Shilong,Qi, Zhaoxiang,Cao, Zihuang,&Tang, Zhenghong.(2021).Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,133(1020),9.
MLA Liao, Shilong,et al."Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 133.1020(2021):9.
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