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题名: THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES
作者: Gu, Minfeng1, 2; Chen, Yongjun1, 3; Komossa, S.4; Yuan, Weimin5; Shen, Zhiqiang1, 3; Wajima, Kiyoaki6; Zhou, Hongyan7, 8; Zensus, J. A.4
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2015-11-01
卷号: 221, 期号:1
关键词: galaxies: active ; galaxies: jets ; galaxies: Seyfert ; radio continuum: galaxies
DOI: 10.1088/0067-0049/221/1/3
文章类型: Article
英文摘要: We present the detection of the compact radio structures of 14 radio-loud narrow-line Seyfert 1 (NLS1) galaxies from Very Long Baseline Array (VLBA) observations at 5 GHz performed in 2013. While 50% of the sources of our sample show a compact core only, the remaining 50% exhibit a core-jet structure. The measured brightness temperatures of the cores range from 10(8.4) to 10(11.4) K with a median value of 10(10.1) K, indicating that the radio emission is from non-thermal jets, and that, likely, most sources are not strongly beamed, thus implying a low jet speed in these radio-loud NLS1 galaxies. In combination with archival data taken at multiple frequencies, we find that seven sources show flat or even inverted radio spectra, while steep spectra are revealed in the remaining seven objects. Although all of these sources are very radio-loud with R > 100, their jet properties are diverse in terms of their milliarcsecond (mas) scale (parsec scale) morphology and their overall radio spectral shape. The evidence for slow jet speeds (i.e., less relativistic jets), in combination with the low kinetic/radio power, may offer an explanation for the compact VLBA radio structure in most sources. The mildly relativistic jets in these high accretion rate systems are consistent with a scenario where jets are accelerated from the hot corona above the disk by the magnetic field and the radiation force of the accretion disk. Alternatively, a low jet bulk velocity can be explained by low spin in the Blandford-Znajek mechanism.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: ACTIVE GALACTIC NUCLEI ; COMPACT STEEP-SPECTRUM ; BLACK-HOLE SPIN ; GAMMA-RAY EMISSION ; SKY SURVEY ; ENERGY-DISTRIBUTION ; 1ST-BASED SURVEY ; EVENT HORIZON ; ACCRETION ; QUASARS
收录类别: SCI
项目资助者: National Science Foundation of China(11473054 ; Science and Technology Commission of Shanghai Municipality(14ZR1447100 ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences(XDA04060700) ; 11273042 ; 12ZR1436100) ; 11473035 ; 11173046 ; U1531245)
语种: 英语
WOS记录号: WOS:000366620600003
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16083
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Max Planck Inst Radioastron, D-53121 Bonn, Germany
5.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
6.Korea Astron & Space Sci Inst, Daejeon 305348, South Korea
7.Polar Res Inst China, Shanghai 200136, Peoples R China
8.Chinese Acad Sci, Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
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