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VLBI observations of flared optical quasar CGRaBS J0809+5341
An, Tao1,2,3; Cui, Yu-Zhu1,2; Paragi, Zsolt4; Frey, Sandor5; Gurvits, Leonid I.4,6; Gabanyi, Krisztina E.5,7
2016-10-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN0004-6264
Volume68Issue:5
AbstractA bright optical flare was detected in the high-redshift (z = 2.133) quasar CGRaBS J0809+5341 on 2014 April 13. The absolute magnitude of the object reached -30.0 during the flare, making it the brightest one (in flaring stage) among all known quasars so far. The 15-GHz flux density of CGRaBS J0809+5341 monitored in the period from 2008 to 2016 also reached its peak at the same time. To reveal any structural change possibly associated with the flare in the innermost radio structure of the quasar, we conducted a pilot very long baseline interferometry (VLBI) observation of CGRaBS J0809+5341 using the European VLBI Network (EVN) at 5 GHz on 2014 November 18, about seven months after the prominent optical flare. Three epochs of follow-up KaVA (Korean VLBI Network and VLBI Exploration of Radio Astrometry Array) observations were carried out at 22- and 43-GHz frequencies from 2015 February 25 to June 4, with the intention of exploring a possibly emerging new radio jet component associated with the optical flare. However, these high-resolution VLBI observations revealed only the milliarcsecond-scale compact "core" that was known in the quasar from earlier VLBI images, and showed no sign of any extended jet structure. Neither the size nor the flux density of the "core" changed considerably after the flare, according to our VLBI monitoring. The results suggest that any putative radio ejecta associated with the major optical and radio flare could not yet be separated from the "core" component, or the newly-born jet was short-lived.
KeywordGalaxies: Active Radio Continuum: Galaxies Quasars: Individual (Cgrabs j0809+5341) Techniques: Interferometric
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/pasj/psw067
WOS KeywordACTIVE GALACTIC NUCLEI ; EXTREMELY DISTANT QUASARS ; REDSHIFT FERMI BLAZARS ; COMPACT RADIO-SOURCES ; LARGE-AREA TELESCOPE ; BL LACERTAE OBJECTS ; GAMMA-RAY ACTIVITY ; CORRELATED RADIO ; PKS 1510-089 ; SKY SURVEY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000386203400010
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23608
Collection中国科学院紫金山天文台
Corresponding AuthorAn, Tao
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Shanghai Inst Technol, Sch Elect & Elect Engn, 100 Hai Quan Rd, Shanghai 201418, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
4.Joint Inst VLBI ERIC, Postbus 2, NL-7990 AA Dwingeloo, Netherlands
5.FOMI Satellite Geodet Observ, POB 585, H-1592 Budapest, Hungary
6.Delft Univ Technol, Dept Astrodynam & Space Missions, Kluyverweg 1, NL-2629 HS Delft, Netherlands
7.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, POB 67, H-1525 Budapest, Hungary
Recommended Citation
GB/T 7714
An, Tao,Cui, Yu-Zhu,Paragi, Zsolt,et al. VLBI observations of flared optical quasar CGRaBS J0809+5341[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2016,68(5).
APA An, Tao,Cui, Yu-Zhu,Paragi, Zsolt,Frey, Sandor,Gurvits, Leonid I.,&Gabanyi, Krisztina E..(2016).VLBI observations of flared optical quasar CGRaBS J0809+5341.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,68(5).
MLA An, Tao,et al."VLBI observations of flared optical quasar CGRaBS J0809+5341".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 68.5(2016).
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