X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS

	X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS
	Ai YL(艾艳丽)1,4 ; Yuan, WM2,4 ; Zhou, HY 3; Wang, TG 3; Zhang, SH 3
刊名	ASTROPHYSICAL JOURNAL
	2011-01-20
卷号	727 期号:1
关键词	galaxies: active galaxies: Seyfert X-rays: galaxies
ISSN号	0004-637X
通讯作者	Ai, YL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming, Yunnan, Peoples R China.
产权排序	第一完成单位
英文摘要	Narrow-line Seyfert 1 galaxies (NLS1s) with very small broadline widths (say, FWHM(H beta) less than or similar to 1200 km s(-1)) represent the extreme type of Seyfert 1 galaxies that have small black hole masses (M-BH) and/or high Eddington ratios (L/L-Edd). Here, we study the X-ray properties of a homogeneously and optically selected sample of 13 such objects, termed as very narrow line Seyfert 1 galaxies, using archival XMM-Newton data. It is found that the Fe K alpha emission line is at most weak in these objects. A soft X-ray excess is ubiquitous, with the thermal temperatures falling within a strict range of 0.1-0.2 keV. Our result highlights the puzzling independence of the thermal temperature by extending the relations to even smaller FWHM(H beta), i.e., smaller M-BH (similar to 10(6) M-circle dot) and/or higher L/L-Edd. The excess emission can be modeled by a range of viable models, though the disk reflection and Comptonization models generally give somewhat better fits over the smeared absorption and the p-free models. At the Eddington ratios around unity and above, the X-ray spectral slopes in the 2-10 keV band are systematically flatter than the predictions of the relationship with L/L-Edd suggested previously. Short timescale (1-2 hr) X-ray variability is common, which, together with the variability amplitude computed for some of the objects, is supportive of the scenario that NLS1s are indeed active galactic nuclei with relatively small M-BH.
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 ; MASS BLACK-HOLES ; DIGITAL SKY SURVEY ; XMM-NEWTON VIEW ; ACCRETION-DISK ; ENERGY-DISTRIBUTION ; SPECTRAL SLOPE ; SOFT EXCESS ; PG QUASARS ; EMISSION
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/727/1/31/meta
语种	英语
WOS记录号	WOS:000285992000031
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5016]
专题	云南天文台_高能天体物理研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan, P.O. Box 110, China 2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 3.Key Laboratory for Research in Galaxies and Cosmology, Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, China 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China
推荐引用方式 GB/T 7714	Ai YL,Yuan, WM,Zhou, HY,et al. X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS[J]. ASTROPHYSICAL JOURNAL,2011,727(1).
APA	Ai YL,Yuan, WM,Zhou, HY,Wang, TG,&Zhang, SH.(2011).X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS.ASTROPHYSICAL JOURNAL,727(1).
MLA	Ai YL,et al."X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS".ASTROPHYSICAL JOURNAL 727.1(2011).