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Are narrow-line Seyfert 1 galaxies highly accreting low M BH AGNs?
James K. Williams,Mario Gliozzi,Ross V. Rudzinsky +2 more
- Vol. 231
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TLDR
In this article, the authors test the hypothesis that narrow-line Seyfert 1 galaxies (NSL1s) are active galactic nuclei in their early phase and are therefore younger and more active than the more common broad-line BLS1s.Abstract:
In this work, we test the hypothesis that narrow-line Seyfert 1 galaxies (NSL1s) are active galactic nuclei in their early phase and are therefore younger and more active than the more common broad-line Seyfert 1 galaxies (BLS1s). If that is true, then NLS1s should, on average, have lower black hole (BH) masses and higher accretion rates than BLS1s. To test this, we use a sample of 35 NLS1s and 54 BLS1s with similar X-ray luminosity distributions and good XMM-Newton observations. To determine the BH mass MBH, we apply an X-ray scaling method that is independent of any assumptions on the broad-line region dynamics and the inclination of the objects. We find that, on average, NLS1s have lower BH masses, but the difference between the average MBH of NLS1s and BLS1s in our sample is only marginally significant (at the 2.6 sigma level). According to a Kolmogorov–Smirnov test, the distribution of MBH values of NLS1s is different from that of BLS1s at the 99% confidence level. Even stronger differences between NLS1s and BLS1s are inferred when the accretion rate distributions of NLS1s are compared to BLS1s, suggesting that the two populations are indeed distinct. Our study also indicates that the MBH values (both for NLS1s and BLS1s) determined with the X-ray scaling method are fully consistent with those obtained using reverberation mapping.read more
Citations
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Steps toward determination of the size and structure of the broad-line region in active galactic nuclei .11. Intensive monitoring of the ultraviolet spectrum of NGC 7469
Ignaz Wanders,Bradley M. Peterson,Danielle Alloin,Thomas R. Ayres,J. Clavel,D. M. Crenshaw,Keith Horne,Gerard A. Kriss,Julian H. Krolik,M. A. Malkan,H. Netzer,P. T. O'Brien,Gail A. Reichert,P. M. Rodríguez-Pascual,Willem Wamsteker,Tal Alexander,Ksj Anderson,Erika Benítez,N. G. Bochkarev,Alexander N. Burenkov,FZ Cheng,Stefan Collier,Andrea Comastri,M. Dietrich,D DultzinHacyan,Brian R. Espey,Alexei V. Filippenko,C. M. Gaskell,Ian M. George,Goad,Luis C. Ho,Shai Kaspi,Wolfram Kollatschny,Kirk T. Korista,Ari Laor,Gordon M. MacAlpine,M. Mignoli,Simon L. Morris,K. Nandra,Steve Penton,R. W. Pogge,Roger Ptak,J. M. Rodriguez-Espinoza,Maria Santos-Lleo,Alla I. Shapovalova,J. M. Shull,Stephanie A. Snedden,Linda S. Sparke,G. M. Stirpe,Wei-Hsin Sun,T. J. Turner,M. H. Ulrich,Tinggui Wang,C. Wei,W. F. Welsh,SJ Xue,Z.-L. Zou +56 more
TL;DR: In this paper, the International Ultraviolet Explorer monitored the Seyfert 1 galaxy NGC 7469 continuously in an attempt to measure time delays between the continuum and emission-line fluxes.
Journal ArticleDOI
Black hole growth by accretion
Smita Mathur,Dirk Grupe +1 more
TL;DR: In this article, the authors show that not all NLS1s accrete at close to Eddington rates: those with low {L/L_{Eddington}} are close to the M_BH-sigma relation, and those with high {L /L are far.
Journal ArticleDOI
Examining the physical conditions of a warm corona in active galactic nuclei accretion discs
TL;DR: In this paper, the authors present one-dimensional calculations of the physical conditions and emitted spectra of a gas layer subject to illumination from an X-ray power-law (from above), a blackbody (from below) and a variable amount of internal heating.
Journal ArticleDOI
General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies
Vaidehi S. Paliya,Michael Parker,Jiachen Jiang,Andrew C. Fabian,Laura Brenneman,Marco Ajello,Dieter H. Hartmann +6 more
TL;DR: In this paper, a detailed multi-wavelength study of a sample of sixteen narrow-line Seyfert 1 (NLSy1) galaxies known in $\gamma$-rays is presented.
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Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
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The Emission-Line Properties of Low-Redshift Quasi-stellar Objects
Todd A. Boroson,Richard F. Green +1 more
TL;DR: In this article, an empirical technique which allows the measurement and subtraction of the many Fe II lines in this region has been developed and applied to these spectra, and a four-dimensional parameterization of the Hβ profile has been combined with optical, radio, and X-ray continuum information from the literature to try to understand how these properties are related.
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Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies
Kelly D. Denney,Bradley M. Peterson,Richard W. Pogge,A. Adair,David W. Atlee,K. Au-Yong,Misty C. Bentz,Misty C. Bentz,Jonathan C. Bird,D. J. Brokofsky,E. Chisholm,M. L. Comins,M. L. Comins,M. Dietrich,V. T. Doroshenko,V. T. Doroshenko,Jason D. Eastman,Yu. S. Efimov,S. Ewald,S. Ferbey,C. M. Gaskell,C. M. Gaskell,C. H. Hedrick,C. H. Hedrick,Kelly M. Jackson,S. A. Klimanov,E. S. Klimek,E. S. Klimek,A. K. Kruse,A. K. Kruse,A. Ladéroute,J. B. Lamb,Karen M. Leighly,Takeo Minezaki,S. V. Nazarov,Christopher A. Onken,Christopher A. Onken,Eric A. Petersen,P. Peterson,Shawn Poindexter,Yu Sakata,Katharine J. Schlesinger,S. G. Sergeev,N. Skolski,L. Stieglitz,John J. Tobin,Cayman T. Unterborn,Marianne Vestergaard,Marianne Vestergaard,A. E. Watkins,Lorna Watson,Yuzuru Yoshii +51 more
TL;DR: In this article, the authors present the final results from a high sampling rate, multi-month, spectrophotometric reverberation mapping campaign undertaken to obtain either new or improved Hβ reverberation lag measurements for several relatively low-luminosity active galactic nuclei (AGNs).