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The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI
Cao, Hong-Min1,2; Frey, Sandor3; Gabanyi, Krisztinae E.3,4; Yang, Jun5; Cui, Lang1; Hong, Xiao-Yu6; An, Tao6
2019
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume482Issue:1Pages:L34-L39
Corresponding AuthorCao, Hong-Min(hongmin.cao@foxmail.com) ; Frey, Sandor(frey.sandor@csfk.mta.hu)
AbstractBL Lac objects are known to have compact jets inclined to our line of sight at a small angle, showing prominent radio emission. Two radio-weak BL Lac candidates with no counterparts in current radio surveys were recently reported by Massaro et al. Both sources were selected as candidate low-energy counterparts of unassociated Fermi gamma-ray sources. We carried out very long baseline interferometry (VLBI) observations with the European VLBI Network (EVN) at 5 GHz to explore their radio properties at the milliarcsecond (mas) scale. One target, J1410+7405, is clearly detected with the EVN. Its measured 5-GHz flux density, 2.4 mJy, is consistent with recent interferometric measurements with the Karl G. Jansky Very Large Array, suggesting that the radio emission is confined to the inner less than or similar to 10-mas region. J1410+7405 is therefore identified as a radio-loud jetted active galactic nucleus, and its brightness temperature exceeds similar to 10(9) K. Its properties are similar to those of other gamma-ray-detected BL Lac objects. On the other hand, the second target, J0644+6031, remains undetected with the EVN with a 6 sigma brightness upper limit of 0.12 mJy beam(-1). This source is thus radio-quiet, confirming its peculiarity, or possibly questioning its BL Lac nature.
Keywordgalaxies: active BL Lacertae objects: general galaxies: individual: J0644+6031 galaxies: individual: J1410+7405 quasars: general
DOI10.1093/mnrasl/sly184
WOS KeywordVLA ; OBJECTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000482176700008
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/28087
Collection中国科学院紫金山天文台
Corresponding AuthorCao, Hong-Min; Frey, Sandor
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
2.Shangqiu Normal Univ, Sch Elect & Elect Engn, Wenhua Rd 298, Shangqiu 476000, Henan, Peoples R China
3.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
4.MTA ELTE Extragalact Astrophys Res Grp, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary
5.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden
6.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Radio Astron, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Cao, Hong-Min,Frey, Sandor,Gabanyi, Krisztinae E.,et al. The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(1):L34-L39.
APA Cao, Hong-Min.,Frey, Sandor.,Gabanyi, Krisztinae E..,Yang, Jun.,Cui, Lang.,...&An, Tao.(2019).The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(1),L34-L39.
MLA Cao, Hong-Min,et al."The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.1(2019):L34-L39.
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