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

	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, XB2,3 ; Wang, TG 2,3; Lu, HL 2,3; Bai JM(白金明)1
刊名	ASTROPHYSICAL JOURNAL
	2008-10-01
卷号	685 期号:2 页码:801-827
关键词	galaxies : active galaxies : jets galaxies : Seyfert quasars : general radio continuum : galaxies X-rays : galaxies
ISSN号	0004-637X
通讯作者	Yuan, W (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
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 ; 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
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/685/2/801/
语种	英语
WOS记录号	WOS:000259550300010
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4961]
专题	云南天文台_高能天体物理研究组
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
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.,...&Bai JM.(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.