A comprehensive study of 2000 narrow line Seyfert 1 galaxies from the Sloan Digital Sky Survey. I. The sample

	A comprehensive study of 2000 narrow line Seyfert 1 galaxies from the Sloan Digital Sky Survey. I. The sample
	Zhou, HY 1,2; Wang, TG 1,3; Yuan WM(袁为民)3 ; Lu, HL 1,2; Dong, XB1,2 ; Wang, JX1,2 ; Lu, YJ 1
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2006-09
卷号	166 期号:1 页码:128-153
关键词	galaxies : active galaxies : Seyfert
ISSN号	0067-0049
通讯作者	Zhou, HY (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China.
产权排序	第二完成单位
英文摘要	This is the first paper in a series dedicated to the study of the emission-line and continuum properties of narrow line Seyfert 1 galaxies (NLS1s). We carried out a systematic search for NLS1s from objects assigned as "QSOs'' or "galaxies'' in the spectroscopic sample of the Sloan Digital Sky Survey Data Release 3 (SDSS DR3) by a careful modeling of their emission lines and continua. The result is a uniform sample comprising similar to 2000 NLS1s. This sample dramatically increases the number of known NLS1s by a factor of similar to 10 over previous compilations. This paper presents the parameters of the prominent emission lines and continua, which were measured accurately with typical uncertainties < 10%. Taking advantage of such an unprecedented large and uniform sample with accurately measured spectral parameters, we carried out various statistical analyses, some of which were only possible for the first time. The main results found are as follows. (1) Within the overall Seyfert 1 population, the incidence of NLS1s is strongly dependent on the optical, X-ray, and radio luminosities as well as the radio loudness. The fraction of NLS1s peaks around SDSS g-band absolute magnitude M-g similar to -22 mag in the optical and similar to 10(43.2) ergs s(-1) in the soft X-ray band, and decreases quickly as the radio loudness increases. (2) On average the relative Fe II emission, R-4570 = Fe II lambda lambda 4434-4684/H beta, in NLS1s is about twice that in normal active galactic nuclei (AGNs) and is anticorrelated with the broad component width of the Balmer emission lines. (3) The well-known anticorrelation between the width of broad low-ionization lines and the soft X-ray spectral slope for broad line AGNs extends down to FWHM similar to 1000 km s(-1) in NLS1s, but the trend appears to reverse at still smaller line widths. (4) The equivalent width of H beta and Fe II emission lines are strongly correlated with the H beta and continuum luminosities. (5) We do not find any difference between NLS1s and normal AGNs in regard to the narrow line region. (6) We have examined the black hole mass versus stellar velocity dispersion (M-BH-sigma()) relation for a subsample of 308 NLS1s for which sigma() could be measured directly from fitting the starlight in the SDSS spectra with our stellar spectral templates. A significant correlation between M-BH and sigma() is found, but with the bulk of black hole masses falling below the values expected from the M-BH-sigma() relation for normal galaxies and normal AGNs. This result indicates that NLS1s are underage AGNs, where the growth of the SMBH lags behind the formation of the galactic bulge. (7) We also find that the FWHM of [N II] line is well correlated with sigma() in 206 NLS1s, for which both parameters could be derived with reasonable accuracy. The [N II] width can predict the stellar velocity dispersion to an accuracy of similar to 30%. A similar M-BH-sigma() relation could be found for a larger sample of 613 NLS1s on making use of the more reliable measurements of FWHM[N II].
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 ; X-RAY-PROPERTIES ; SPECTROSCOPIC TARGET SELECTION ; EARLY DATA RELEASE ; OPTICALLY SELECTED QUASARS ; HIGH-REDSHIFT QUASARS ; RADIO-LOUD ; VELOCITY DISPERSION ; EMISSION
收录类别	SCI
原文出处	http://iopscience.iop.org/0067-0049/166/1/128/
语种	英语
WOS记录号	WOS:000240404000005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4946]
专题	云南天文台_高能天体物理研究组
作者单位	1.Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan, P.O. Box 110, China 3.Joint Institute of Galaxies and Cosmology, SHAO and USTC
推荐引用方式 GB/T 7714	Zhou, HY,Wang, TG,Yuan WM,et al. A comprehensive study of 2000 narrow line Seyfert 1 galaxies from the Sloan Digital Sky Survey. I. The sample[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2006,166(1):128-153.
APA	Zhou, HY.,Wang, TG.,Yuan WM.,Lu, HL.,Dong, XB.,...&Lu, YJ.(2006).A comprehensive study of 2000 narrow line Seyfert 1 galaxies from the Sloan Digital Sky Survey. I. The sample.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,166(1),128-153.
MLA	Zhou, HY,et al."A comprehensive study of 2000 narrow line Seyfert 1 galaxies from the Sloan Digital Sky Survey. I. The sample".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 166.1(2006):128-153.