The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI

doi:10.1093/mnrasl/sly184

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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, Sandor 3; Gabanyi, Krisztinae E.3,4; Yang, Jun5 ; Cui, Lang1 ; Hong, Xiao-Yu 6; An, Tao 6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019
卷号	482 期号:1 页码:L34-L39
关键词	galaxies: active BL Lacertae objects: general galaxies: individual: J0644+6031 galaxies: individual: J1410+7405 quasars: general
ISSN号	0035-8711
DOI	10.1093/mnrasl/sly184
产权排序	1
英文摘要	BL 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.
资助项目	Hungarian National Research, Development and Innovation Office[OTKA NN110333] ; National Natural Science Foundation of China[11503072] ; EVN[EC061] ; CAS 'Light of West China' programme[2016-QNXZ-B-21] ; CAS 'Light of West China' programme[YBXM-2014-02] ; National Natural Science Foundation of China[U1731103] ; National Natural Science Foundation of China[11573016] ; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
WOS关键词	VLA ; OBJECTS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000482176700008
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/2967]
专题	研究单元未命名
通讯作者	Cao, Hong-Min; Frey, Sandor
作者单位	1.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
推荐引用方式 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.