A population of radio-loud narrow-line Seyfert 1 galaxies with blazar-like properties?

doi:10.1086/591046

YNAO OpenIR > 高能天体物理研究组

	A population of radio-loud narrow-line Seyfert 1 galaxies with blazar-like properties?
	Yuan WM(袁为民)1 ; Zhou, HY 2,3,4; Komossa, S 4; Dong, XB 2,3; Wang, TG 2,3; Lu, HL 2,3; Bai JM(白金明)1 ; Yuan, W (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2008-10-01
卷号	685 期号:2 页码:801-827
DOI	10.1086/591046
产权排序	第1完成单位
收录类别	SCI
关键词	Galaxies : Active Galaxies : Jets Galaxies : Seyfert Quasars : General Radio Continuum : Galaxies X-rays : Galaxies
摘要	Blazars having strong emission lines were found to be associated mostly with broad-line type 1 active galactic nuclei (AGNs). Hitherto, evidence for blazars identified with narrow-line Seyfert 1 (NLS1) AGNs was limited to only a very few individual cases. Here we present a comprehensive study of a sample of 23 genuine radio-loud NLS1 AGNs with radio loudness larger than 100. The radio sources of the sample are ubiquitously compact, unresolved on scales of several arcseconds. Some of these objects show interesting radio to X-ray properties that are unusual to most of the previously known radio-loud NLS1 AGNs, but are reminiscent of blazars. These include flat radio spectra, large-amplitude flux and spectral variability, compact VLBI cores, very high variability brightness temperatures, enhanced optical continuum emission, flat X-ray spectra, and blazar-like spectral energy distributions (SEDs). We interpret them as signatures of the postulated blazar nature of some of the objects, which likely possess at least moderately relativistic jets. Intrinsically, some of them have relatively low radio power and would have been classified as radio-intermediate AGNs. The black hole masses are estimated to be within 10(6)-10(8) M-circle dot, and the Eddington ratios close to unity, as in normal NLS1 AGNs. The results imply that radio-loud AGNs may be powered by black holes of moderate masses (similar to 10(6)-10(7) M-circle dot) accreting at high rates. Some of the objects, despite having strong emission lines, resemble high-energy-peaked BL Lac objects (HBLs) in their SEDs. Given the peculiarities of blazar-like NLS1 AGNs, questions arise as to whether they are plain downsizing extensions of normal radio-loud AGNs, or form a previously unrecognized population.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
归档日期	2008-11-10
WOS记录号	WOS:000259550300010
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; BLACK-HOLE MASS ; BL-LACERTAE OBJECTS ; X-RAY-SPECTRA ; DIGITAL SKY SURVEY ; BRIGHT QUASAR SURVEY ; REFRACTIVE INTERSTELLAR SCINTILLATION ; COMPACT STEEP-SPECTRUM ; HOST GALAXY/AGN CONNECTION ; BAND ENERGY-DISTRIBUTION
引用统计	被引频次：205[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4961
专题	高能天体物理研究组
通讯作者	Yuan, W (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China 2.Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui 230026, China 3.Joint Institute of Galaxies and Cosmology, SHAO and USTC 4.Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Yuan WM,Zhou, HY,Komossa, S,et al. A population of radio-loud narrow-line Seyfert 1 galaxies with blazar-like properties?[J]. ASTROPHYSICAL JOURNAL,2008,685(2):801-827.
APA	Yuan WM.,Zhou, HY.,Komossa, S.,Dong, XB.,Wang, TG.,...&Yuan, W .(2008).A population of radio-loud narrow-line Seyfert 1 galaxies with blazar-like properties?.ASTROPHYSICAL JOURNAL,685(2),801-827.
MLA	Yuan WM,et al."A population of radio-loud narrow-line Seyfert 1 galaxies with blazar-like properties?".ASTROPHYSICAL JOURNAL 685.2(2008):801-827.

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