The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86GHz

doi:10.3847/1538-4365/aa9e4b

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	The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86GHz
	Cheng, X. -P.1,7; An, T.2,7; Hong, X. -Y.1,2,7; Yang, J.3,7; Mohan, P.7; Kellermann, K. I.6; Lister, M. L.5; Frey, S.4; Zhao, W.7; Zhang, Z. -L.7
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2018
卷号	234 期号:1
关键词	Galaxies: Active Galaxies: Jets Quasars: General Surveys Techniques: High Angular Resolution
ISSN号	0067-0049
DOI	10.3847/1538-4365/aa9e4b
英文摘要	Radio-loud active galactic nuclei (AGNs), hosting powerful relativistic jet outflows, provide an excellent laboratory for studying jet physics. Very long baseline interferometry (VLBI) enables high-resolution imaging on milli-arcsecond (mas) and sub-mas scales, making it a powerful tool to explore the inner jet structure, shedding light on the formation, acceleration, and collimation of AGN jets. In this paper, we present Very Long Baseline Array observations of 10 radio-loud AGNs at 43 and 86 GHz that were selected from the Planck catalog of compact sources and are among the brightest in published VLBI images at and below 15 GHz. The image noise levels in our observations are typically 0.3 and 1.5 mJy beam(-1) at 43 and 86 GHz, respectively. Compared with the VLBI data observed at lower frequencies from the literature, our observations with higher resolutions (with the highest resolution being up to 0.07 mas at 86 GHz and 0.18 mas at 43 GHz) and at higher frequencies detected new jet components at sub-parsec scales, offering valuable data for studies of the physical properties of the innermost jets. These include the compactness factor of the radio structure (the ratio of core flux density to total flux density), and core brightness temperature (T-b). In all these sources, the compact core accounts for a significant fraction (>60%) of the total flux density. Their correlated flux density at the longest baselines is higher than 0.16 Jy. The compactness of these sources make them good phase calibrators of millimeter-wavelength ground-based and space VLBI.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000422956700001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32517]
专题	中国科学院上海天文台
通讯作者	Cheng, X. -P.
作者单位	1.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ, SE-43992 Onsala, Sweden 4.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary 5.Purdue Univ, Dept Phys, 525 Northwestern Ave, W Lafayette, IN 47907 USA 6.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA 7.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Cheng, X. -P.,An, T.,Hong, X. -Y.,et al. The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86GHz[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,234(1).
APA	Cheng, X. -P..,An, T..,Hong, X. -Y..,Yang, J..,Mohan, P..,...&Zhang, Y. -K..(2018).The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86GHz.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,234(1).
MLA	Cheng, X. -P.,et al."The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86GHz".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 234.1(2018).