A Comprehensive Study of 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey. I. The Sample
Hongyan Zhou,Hongyan Zhou,Tinggui Wang,Tinggui Wang,Weimin Yuan,Honglin Lu,Honglin Lu,Xiao-Bo Dong,Xiao-Bo Dong,Jun-Xian Wang,Jun-Xian Wang,Youjun Lu +11 more
TLDR
In this article, the emission lines and continua of NLS1s were measured accurately with typical uncertainties < 10% for the SDSS DR3 data set and various statistical analyses were carried out, some of which were only possible for the first time.Abstract:
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].read more
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Galaxy Zoo Green Peas: discovery of a class of compact extremely star-forming galaxies
Carolin N. Cardamone,Kevin Schawinski,Marc Sarzi,Steven P. Bamford,Nicola Bennert,C. M. Urry,Chris Lintott,William C. Keel,John K. Parejko,Robert C. Nichol,Daniel Thomas,Dan Andreescu,Phil Murray,M. Jordan Raddick,Anže Slosar,Alexander S. Szalay,Jan Vandenberg +16 more
TL;DR: In this paper, the authors investigate a class of rapidly growing emission line galaxies, known as "Green Peas", which were first noted by volunteers in the Galaxy Zoo project because of their peculiar bright green colour and small size, unresolved in SDSS imaging.
Journal ArticleDOI
Radio-Loud Narrow-Line Seyfert 1 as a New Class of Gamma-Ray Active Galactic Nuclei
A. A. Abdo,A. A. Abdo,Markus Ackermann,Marco Ajello,Luca Baldini,Jean Ballet,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,Keith Bechtol,R. Bellazzini,B. Berenji,Elliott D. Bloom,Emanuele Bonamente,Emanuele Bonamente,A. W. Borgland,J. Bregeon,Alessandro Brez,M. Brigida,M. Brigida,Pascal Bruel,T. H. Burnett,G. A. Caliandro,R. A. Cameron,P. A. Caraveo,J. M. Casandjian,Claudia Cecchi,Claudia Cecchi,Ö. Çelik,Ö. Çelik,A. Chekhtman,A. Chekhtman,C. C. Cheung,C. C. Cheung,James Chiang,Stefano Ciprini,R. Claus,Johann Cohen-Tanugi,Jan Conrad,Jan Conrad,S. Cutini,Charles D. Dermer,F. de Palma,F. de Palma,E. Do Couto E Silva,Persis S. Drell,R. Dubois,D. Dumora,C. Farnier,C. Favuzzi,C. Favuzzi,S. J. Fegan,W. B. Focke,Luigi Foschini,M. Frailis,Yasushi Fukazawa,P. Fusco,P. Fusco,F. Gargano,Neil Gehrels,Neil Gehrels,Neil Gehrels,S. Germani,S. Germani,B. Giebels,Nicola Giglietto,Nicola Giglietto,Francesco Giordano,Francesco Giordano,Marcello Giroletti,T. Glanzman,G. Godfrey,I. A. Grenier,J. E. Grove,L. Guillemot,Sylvain Guiriec,M. Hayashida,E. Hays,D. Horan,R.E. Hugues,Gudlaugur Johannesson,A. S. Johnson,W. N. Johnson,Matthias Kadler,T. Kamae,Hideaki Katagiri,Jun Kataoka,Matthew Kerr,Jürgen Knödlseder,M. Kuss,J. Lande,Luca Latronico,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,B. Lott,M. N. Lovellette,P. Lubrano,P. Lubrano,A. Makeev,A. Makeev,M. N. Mazziotta,W. McConville,W. McConville,Julie McEnery,Julie McEnery,C. Meurer,Peter F. Michelson,W. Mitthumsiri,Tsunefumi Mizuno,C. Monte,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,P. L. Nolan,J. P. Norris,E. Nuss,T. Ohsugi,Nicola Omodei,E. Orlando,J. F. Ormes,V. Pelassa,M. Pepe,M. Pepe,Massimo Persic,Melissa Pesce-Rollins,F. Piron,T. A. Porter,S. Rainò,S. Rainò,Riccardo Rando,Riccardo Rando,M. Razzano,L. S. Rochester,A. Y. Rodriguez,Felix Ryde,Felix Ryde,Hartmut Sadrozinski,Rita M. Sambruna,A. Sander,P. M. Saz Parkinson,Jeffrey D. Scargle,Carmelo Sgrò,P. D. Smith,Gloria Spandre,P. Spinelli,P. Spinelli,M. S. Strickman,D. J. Suson,G. Tagliaferri,Hiromitsu Takahashi,Tadayuki Takahashi,Takaaki Tanaka,J. B. Thayer,J. G. Thayer,D. J. Thompson,L. Tibaldo,O. Tibolla,Diego F. Torres,Diego F. Torres,G. Tosti,G. Tosti,A. Tramacere,Yasunobu Uchiyama,T. L. Usher,V. Vasileiou,V. Vasileiou,N. Vilchez,V. Vitale,V. Vitale,A. P. Waite,P. Wang,Brian L Winer,K. S. Wood,T. Ylinen,T. Ylinen,M. Ziegler,Gabriele Ghisellini,Laura Maraschi,Fabrizio Tavecchio +183 more
TL;DR: In this paper, the gamma-ray emission from three radio-loud narrow-line Seyfert 1 galaxies was detected with Fermi/LAT, and they may form an emerging new class of gamma ray active galactic nuclei (AGN).
Journal ArticleDOI
The Effect of Radiation Pressure on Virial Black Hole Mass Estimates and the Case of Narrow-Line Seyfert 1 Galaxies
Alessandro Marconi,David J. Axon,Roberto Maiolino,Tohru Nagao,G. Pastorini,Paola Pietrini,Andrew Robinson,Guidetta Torricelli +7 more
TL;DR: In this paper, the effect of radiation pressure from ionizing photons on black hole (BH) mass estimates based on the application of the virial theorem to broad emission lines in AGN spectra was considered.
Journal ArticleDOI
A population of radio-loud narrow-line seyfert 1 galaxies with blazar-like properties?
Weimin Yuan,H.Y. Zhou,H.Y. Zhou,H.Y. Zhou,Stefanie Komossa,Xiao-Bo Dong,Xiao-Bo Dong,Tinggui Wang,Tinggui Wang,Honglin Lu,Honglin Lu,J. M. Bai +11 more
TL;DR: In this article, the authors presented a comprehensive study of 23 radio-loud NLS1 active galactic nuclei with radio loudness larger than 100, which they interpreted as signatures of the postulated blazar nature of some of the objects, which likely possess at least moderately relativistic jets.
Journal ArticleDOI
The Simultaneous Optical-to-X-Ray Spectral Energy Distribution of Soft X-Ray Selected Active Galactic Nuclei Observed by Swift
TL;DR: In this article, the spectral energy distribution (SED) of active galactic nuclei with simultaneous optical/UV and X-ray data was studied and the dependence of the UV-EUV contribution to the bolometric correction was explored.
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TL;DR: The Sloan Digital Sky Survey (SDSS) as discussed by the authors provides the data to support detailed investigations of the distribution of luminous and non-luminous matter in the universe: a photometrically and astrometrically calibrated digital imaging survey of π sr above about Galactic latitude 30° in five broad optical bands to a depth of g' ~ 23 mag.