PMO OpenIR  > 毫米波和亚毫米波技术实验室
THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES
Gu, Minfeng1,2; Chen, Yongjun1,3; Komossa, S.4; Yuan, Weimin5; Shen, Zhiqiang1,3; Wajima, Kiyoaki6; Zhou, Hongyan7,8; Zensus, J. A.4
2015-11-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume221Issue:1
AbstractWe 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.
KeywordGalaxies: Active Galaxies: Jets Galaxies: Seyfert Radio Continuum: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0067-0049/221/1/3
WOS KeywordACTIVE GALACTIC NUCLEI ; COMPACT STEEP-SPECTRUM ; BLACK-HOLE SPIN ; GAMMA-RAY EMISSION ; SKY SURVEY ; ENERGY-DISTRIBUTION ; 1ST-BASED SURVEY ; EVENT HORIZON ; ACCRETION ; QUASARS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000366620600003
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16083
Collection毫米波和亚毫米波技术实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Gu, Minfeng,Chen, Yongjun,Komossa, S.,et al. THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2015,221(1).
APA Gu, Minfeng.,Chen, Yongjun.,Komossa, S..,Yuan, Weimin.,Shen, Zhiqiang.,...&Zensus, J. A..(2015).THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,221(1).
MLA Gu, Minfeng,et al."THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 221.1(2015).
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