Related papers: Photoionized HBeta Emission in NGC 5548: It Breath…

Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548

We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base consists of 1530 optical continuum measurements and 1248…

Astrophysics · Physics 2009-11-07 B. M. Peterson , the International AGN Watch

Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-Line Analysis for NGC 5548

We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved an almost daily cadence with…

Astrophysics of Galaxies · Physics 2017-03-22 L. Pei , M. M. Fausnaugh , A. J. Barth , B. M. Peterson , M. C. Bentz , G. De Rosa , K. D. Denney , M. R. Goad , C. S. Kochanek , K. T. Korista , G. A. Kriss , R. W. Pogge , V. N. Bennert , M. Brotherton , K. I. Clubb , E. Dalla Bontà , A. V. Filippenko , J. E. Greene , C. J. Grier , M. Vestergaard , W. Zheng , Scott M. Adams , Thomas G. Beatty , A. Bigley , Jacob E. Brown , Jonathan S. Brown , G. Canalizo , J. M. Comerford , Carl T. Coker , E. M. Corsini , S. Croft , K. V. Croxall , A. J. Deason , Michael Eracleous , O. D. Fox , E. L. Gates , C. B. Henderson , E. Holmbeck , T. W. -S. Holoien , J. J. Jensen , C. A. Johnson , P. L. Kelly , S. Kim , A. King , M. W. Lau , Miao Li , Cassandra Lochhaas , Zhiyuan Ma , E. R. Manne-Nicholas , J. C. Mauerhan , M. A. Malkan , R. McGurk , L. Morelli , Ana Mosquera , Dale Mudd , F. Muller Sanchez , M. L. Nguyen , P. Ochner , B. Ou-Yang , A. Pancoast , Matthew T. Penny , A. Pizzella , Radosław Poleski , Jessie Runnoe , B. Scott , Jaderson S. Schimoia , B. J. Shappee , I. Shivvers , Gregory V. Simonian , A. Siviero , Garrett Somers , Daniel J. Stevens , M. A. Strauss , Jamie Tayar , N. Tejos , T. Treu , J. Van Saders , L. Vican , S. Villanueva , H. Yuk , N. L. Zakamska , W. Zhu , M. D. Anderson , P. Arévalo , C. Bazhaw , S. Bisogni , G. A. Borman , M. C. Bottorff , W. N. Brandt , A. A. Breeveld , E. M. Cackett , M. T. Carini , D. M. Crenshaw , A. De Lorenzo-Cáceres , M. Dietrich , R. Edelson , N. V. Efimova , J. Ely , P. A. Evans , G. J. Ferland , K. Flatland , N. Gehrels , S. Geier , J. M. Gelbord , D. Grupe , A. Gupta , P. B. Hall , S. Hicks , D. Horenstein , Keith Horne , T. Hutchison , M. Im , M. D. Joner , J. Jones , J. Kaastra , S. Kaspi , B. C. Kelly , J. A. Kennea , M. Kim , S. C. Kim , S. A. Klimanov , J. C. Lee , D. C. Leonard , P. Lira , F. MacInnis , S. Mathur , I. M. McHardy , C. Montouri , R. Musso , S. V. Nazarov , H. Netzer , R. P. Norris , J. A. Nousek , D. N. Okhmat , I. Papadakis , J. R. Parks , J. -U. Pott , S. E. Rafter , H. -W. Rix , D. A. Saylor , K. Schnülle , S. G. Sergeev , M. Siegel , A. Skielboe , M. Spencer , D. Starkey , H. -I. Sung , K. G. Teems , C. S. Turner , P. Uttley , C. Villforth , Y. Weiss , J. -H. Woo , H. Yan , S. Young , Y. Zu

Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XV. Long-Term Optical Monitoring of NGC 5548

We present the results of three years of ground-based observations of the Seyfert 1 galaxy NGC 5548, which combined with previously reported data, yield optical continuum and broad-line H-beta light curves for a total of eight years. The…

Astrophysics · Physics 2009-10-30 B. M. Peterson , A. J. Barth , P. Berlind , R. Bertram , K. Bischoff , N. G. Bochkarev , A. N. Burenkov , F. -Z. Cheng , M. Dietrich , A. V. Filippenko , E. Giannuzzo , L. C. Ho , J. P. Huchra , J. Hunley , S. Kaspi , W. Kollatschny , D. C. Leonard , Yu. F. Malkov , T. Matheson , M. Mignoli , B. Nelson , P. Papaderos , J. Peters , R. W. Pogge , V. I. Pronik , S. G. Sergeev , E. A. Sergeeva , A. I. Shapovalova , G. M. Stirpe , S. Tokarz , R. M. Wagner , I. Wanders , J. -Y. Wei , B. J. Wilkes , H. Wu , S. -J. Xue , Z. -L. Zou

Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548

We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric and spectroscopic monitoring in the optical and…

Astrophysics of Galaxies · Physics 2020-10-21 P. R. Williams , A. Pancoast , T. Treu , B. J. Brewer , B. M. Peterson , A. J. Barth , M. A. Malkan , G. De Rosa , Keith Horne , G. A. Kriss , N. Arav , M. C. Bentz , E. M. Cackett , E. Dalla Bontà , M. Dehghanian , C. Done , G. J. Ferland , C. J. Grier , J. Kaastra , E. Kara , C. S. Kochanek , S. Mathur , M. Mehdipour , R. W. Pogge , D. Proga , M. Vestergaard , T. Waters , S. M. Adams , M. D. Anderson , P. Arévalo , T. G. Beatty , V. N. Bennert , A. Bigley , S. Bisogni , G. A. Borman , T. A. Boroson , M. C. Bottorff , W. N. Brandt , A. A. Breeveld , M. Brotherton , J. E. Brown , J. S. Brown , G. Canalizo , M. T. Carini , K. I. Clubb , J. M. Comerford , E. M. Corsini , D. M. Crenshaw , S. Croft , K. V. Croxall , A. J. Deason , A. De Lorenzo-Cáceres , K. D. Denney , M. Dietrich , R. Edelson , N. V. Efimova , J. Ely , P. A. Evans , M. M. Fausnaugh , A. V. Filippenko , K. Flatland , O. D. Fox , E. Gardner , E. L. Gates , N. Gehrels , S. Geier , J. M. Gelbord , L. Gonzalez , V. Gorjian , J. E. Greene , D. Grupe , A. Gupta , P. B. Hall , C. B. Henderson , S. Hicks , E. Holmbeck , T. W. -S. Holoien , T. Hutchison , M. Im , J. J. Jensen , C. A. Johnson , M. D. Joner , J. Jones , S. Kaspi , P. L. Kelly , J. A. Kennea , M. Kim , S. Kim , S. C. Kim , A. King , S. A. Klimanov , C. Knigge , Y. Krongold , M. W. Lau , J. C. Lee , D. C. Leonard , Miao Li , P. Lira , C. Lochhaas , Zhiyuan Ma , E. R. Manne-Nicholas , F. MacInnis , J. C. Mauerhan , R. McGurk , I. M. Mc Hardy , C. Montuori , L. Morelli , A. Mosquera , D. Mudd , F. Müller-Sánchez , S. V. Nazarov , R. P. Norris , J. A. Nousek , M. L. Nguyen , P. Ochner , D. N. Okhmat , I. Papadakis , J. R. Parks , L. Pei , M. T. Penny , A. Pizzella , R. Poleski , J. -U. Pott , S. E. Rafter , H. -W. Rix , J. Runnoe , D. A. Saylor , J. S. Schimoia , B. Scott , S. G. Sergeev , B. J. Shappee , I. Shivvers , M. Siegel , G. V. Simonian , A. Siviero , A. Skielboe , G. Somers , M. Spencer , D. Starkey , D. J. Stevens , H. -I. Sung , J. Tayar , N. Tejos , C. S. Turner , P. Uttley , J. Van Saders , S. A. Vaughan , L. Vican , S. Villanueva , C. Villforth , Y. Weiss , J. -H. Woo , H. Yan , S. Young , H. Yuk , W. Zheng , W. Zhu , Y. Zu

Taming the derivative: diagnostics of the continuum and H$\beta$ emission in a prototypical Population B active galaxy

We report preliminary results on the analysis of the continuum and H$\beta$ light curves of the type-1 active galactic nucleus (AGN) NGC 5548. We notice a clear signature of shallowing in the trend between the H$\beta$ and the continuum…

High Energy Astrophysical Phenomena · Physics 2022-02-16 Swayamtrupta Panda , Edi Bon , Paola Marziani , Nataša Bon

Reverberation Mapping of the Broad-line Region in NGC 5548: Evidence for Radiation Pressure?

NGC 5548 is the best-observed reverberation-mapped active galactic nucleus with long-term, intensive monitoring. Here we report results from a new observational campaign between January and July, 2015. We measure the centroid time lag of…

Astrophysics of Galaxies · Physics 2016-08-24 Kai-Xing Lu , Pu Du , Chen Hu , Yan-Rong Li , Zhi-Xiang Zhang , Kai Wang , Ying-Ke Huang , Shao-Lan Bi , Jin-Ming Bai , Luis C. Ho , Jian-Min Wang

Saturation of the curve -- diagnostics of the continuum and H$\beta$ emission in Population B active galaxy NGC 5548

NGC 5548 has been hailed as an archetypical type-1 active galactic nuclei (AGN) and serves as a valuable laboratory to study the long-term variation of its broad-line region (BLR). In this work, we re-affirm our finding on the connection…

Astrophysics of Galaxies · Physics 2023-08-14 Swayamtrupta Panda , Edi Bon , Paola Marziani , Nataša Bon

Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption…

Astrophysics of Galaxies · Physics 2019-09-04 G. A. Kriss , G. De Rosa , J. Ely , B. M. Peterson , J. Kaastra , M. Mehdipour , G. J. Ferland , M. Dehghanian , S. Mathur , R. Edelson , K. T. Korista , N. Arav , A. J. Barth , M. C. Bentz , W. N. Brandt , D. M. Crenshaw , E. Dalla Bontà , K. D. Denney , C. Done , M. Eracleous , M. M. Fausnaugh , E. Gardner , M. R. Goad , C. J. Grier , Keith Horne , C. S. Kochanek , I. M. Mchardy , H. Netzer , A. Pancoast , L. Pei , R. W. Pogge , D. Proga , C. Silva , N. Tejos , M. Vestergaard , S. M. Adams , M. D. Anderson , P. Arévalo , T G. Beatty , E. Behar , V. N. Bennert , S. Bianchi , A. Bigley , S. Bisogni , R. Boissay-Malaquin , G. A. Borman , M. C. Bottorff , A. A. Breeveld , M. Brotherton , J. E. Brown , J. S. Brown , E. M. Cackett , G. Canalizo , M. Cappi , M. T. Carini , K. I. Clubb , J. M. Comerford , C. T. Coker , E. M. Corsini , E. Costantini , S. Croft , K. V. Croxall , A. J. Deason , A. De Lorenzo-Cáceres , B. De Marco , M. Dietrich , L. Di Gesu , J. Ebrero , P. A. Evans , A. V. Filippenko , K. Flatland , E. L. Gates , N. Gehrels , Z S. Geier , J. M. Gelbord , L. Gonzalez , V. Gorjian , D. Grupe , A. Gupta , P. B. Hall , C. B. Henderson , S. Hicks , E. Holmbeck , T. W. -S. Holoien , T. A. Hutchison , M. Im , J. J. Jensen , C. A. Johnson , M. D. Joner , S. Kaspi , B. C. Kelly , P. L. Kelly , J. A. Kennea , M. Kim , S. C. Kim , S. Y. Kim , A. King , S. A. Klimanov , Y. Krongold , M. W. Lau , J. C. Lee , D. C. Leonard , Miao Li , P. Lira , C. Lochhaas , Zhiyuan Ma , F. Macinnis , M. A. Malkan , E. R. Manne-Nicholas , G. Matt , J. C. Mauerhan , R. Mcgurk , C. Montuori , L. Morelli , A. Mosquera , D. Mudd , F. Müller-Sánchez , S. V. Nazarov , R. P. Norris , J. A. Nousek , M. L. Nguyen , P. Ochner , D. N. Okhmat , S. Paltani , J. R. Parks , C. Pinto , A. Pizzella , R. Poleski , G. Ponti , J. -U. Pott , S. E. Rafter , H. -W. Rix , J. Runnoe , D. A. Saylor , J. S. Schimoia , K. Schnülle , B. Scott , S. G. Sergeev , B. J. Shappee , I. Shivvers , M. Siegel , G. V. Simonian , A. Siviero , A. Skielboe , G. Somers , M. Spencer , D. Starkey , D. J. Stevens , H. -I. Sung , J. Tayar , K. G. Teems , T. Treu , C. S. Turner , P. Uttley , J . Van Saders , L. Vican , C. Villforth , S. Villanueva , D. J. Walton , T. Waters , Y. Weiss , J. -H. Woo , H. Yan , H. Yuk , W. Zheng , W. Zhu , Y. Zu

Measuring H-beta BLR Flows in NGC 5548

Using archival International AGN Watch observations we find a correlation between the asymmetry of the H-beta line and the system luminosity: the line becomes bluer as the system gets brighter. We also find a differential lag between the…

Astrophysics · Physics 2007-07-19 William F. Welsh , Danielle L. Martino , Go Kawaguchi , Wolfram Kollatschny

An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548

We investigate the possibility of an intrinsic Baldwin Effect (i.e.,nonlinear emission-line response to continuum variations) in the broad H-beta emission line of the active galaxy NGC 5548 using cross-correlation techniques to remove light…

Astrophysics · Physics 2009-11-07 Karoline M. Gilbert , Bradley M. Peterson

A High-Quality velocity-delay map of the broad-line region in NGC 5548

NGC 5548 has been well spectroscopically monitored for reverberation mapping of the central kinematics by 19 campaigns. Using the maximum entropy method in this Letter, we build up a high-quality velocity-delay map of the H$\beta$ emission…

Astrophysics of Galaxies · Physics 2018-09-26 Ming Xiao , Pu Du , Kai-Xing Lu , Chen Hu , Yan-Rong Li , Zhi-Xiang Zhang , Kai Wang , Ying-Ke Huang , Jin Ming Bai , Weihao Bian , Luis C. Ho , Ye-Fei Yuan , Jian-Min Wang

Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548

We report velocity-delay maps for prominent broad emission lines, Ly_alpha, CIV, HeII and H_beta, in the spectrum of NGC5548. The emission-line responses inhabit the interior of a virial envelope. The velocity-delay maps reveal stratified…

Astrophysics of Galaxies · Physics 2021-02-10 Keith Horne , G. De Rosa , B. M. Peterson , A. J. Barth , J. Ely , M. M. Fausnaugh , G. A. Kriss , L. Pei , S. M. Adams , M. D. Anderson , P. Arevalo , T G. Beatty , V. N. Bennert , M. C. Bentz , A. Bigley , S. Bisogni , G. A. Borman , T. A. Boroson , M. C. Bottorff , W. N. Brandt , A. A. Breeveld , M. Brotherton , J. E. Brown , J. S. Brown , E. M. Cackett , G. Canalizo , M. T. Carini , K. I. Clubb , J. M. Comerford , E. M. Corsini , D. M. Crenshaw , S. Croft , K. V. Croxall , E. Dalla Bonta , A. J. Deason , M. Dehghanian , A. De Lorenzo-Caceres , K. D. Denney , M. Dietrich , C. Done , R. Edelson , N. V. Efimova , M. Eracleous , P. A. Evans , G. J. Ferland , A. V. Filippenko , K. Flatland , O. D. Fox , E. Gardner , E. L. Gates , N. Gehrels , S. Geier , J. M. Gelbord , M. R. Goad , L. Gonzalez , V. Gorjian , J. E. Greene , C. J. Grier , D. Grupe , A. Gupta , P. B. Hall , C. B. Henderson , S. Hicks , E. Holmbeck , T. W. -S. Holoien , T. Hutchison , M. Im , J. J. Jensen , C. A. Johnson , M. D. Joner , J. Jones , J. Kaastra , S. Kaspi , P. L. Kelly , J. A. Kennea , M. Kim , S. Kim , S. C. Kim , A. King , S. A. Klimanov , C. S. Kochanek , K. T. Korista , Y. Krongold , M. W. Lau , J. C. Lee , D. C. Leonard , Miao Li , P. Lira , C. Lochhaas , Zhiyuan Ma , F. MacInnis , M. A. Malkan , E. R. Manne-Nicholas , S. Mathur , J. C. Mauerhan , R. McGurk , I. M. Mc Hardy , C. Montuori , L. Morelli , A. Mosquera , D. Mudd , F. Mueller-Sanchez , S. V. Nazarov , H. Netzer , R. P. Norris , J. A. Nousek , M. L. Nguyen , P. Ochner , D. N. Okhmat , A. Pancoast , I. Papadakis , J. R. Parks , M. T. Penny , A. Pizzella , R. W. Pogge , R. Poleski , J. -U. Pott , D. Proga , S. E. Rafter , H. -W. Rix , J. Runnoe , D. A. Saylor , J. S. Schimoia , K. Schnuelle , B. Scott , S. G. Sergeev , B. J. Shappee , I. Shivvers , M. Siegel , G. V. Simonian , A. Siviero , A. Skielboe , G. Somers , M. Spencer , D. Starkey , D. J. Stevens , M. A. Strauss , H. -I. Sung , J. Tayar , K. G. Teems , N. Tejos , T. Treu , C. S. Turner , P. Uttley , J . Van Saders , M. Vestergaard , L. Vican , S. Villanueva , C. Villforth , Y. Weiss , J. -H. Woo , H. Yan , S. Young , H. Yuk , N. L. Zakamska , W. Zheng , W. Zhu , Y. Zu

Modeling Variable Emission Lines in AGNs: Method and Application to NGC 5548

We present a new scheme for modeling the broad line region in active galactic nuclei (AGNs). It involves photoionization calculations of a large number of clouds, in several pre-determined geometries, and a comparison of the calculated line…

Astrophysics · Physics 2009-10-31 Shai Kaspi , Hagai Netzer

Interpreting broad emission-line variations II: Tensions between luminosity, characteristic size and responsivity

We investigate the variability behaviour of the broad Hb emission-line to driving continuum variations in the best-studied AGN NGC 5548. For a particular choice of BLR geometry, Hb surface emissivity based on photoionization models, and…

Astrophysics of Galaxies · Physics 2015-09-23 Michael R. Goad , Kirk T. Korista

Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VI. Variability of NGC 3783 from ground-based data

The Seyfert 1 galaxy NGC 3783 was intensely monitored between 1991 December and 1992 August. We present the results from the ground-based observations in the optical and near-IR, which complement the data-set from the IUE, discussed…

Astrophysics · Physics 2009-10-22 G. M. Stirpe

Profile variability of the H-alpha and H-beta broad emission lines in NGC5548

Between 1996 and 2002, we have carried out a spectral monitoring program for the Seyfert galaxy NGC 5548. High quality spectra (S/N>50), covering the spectral range (4000-7500)AA were obtained with the 6 m and 1 m telescopes of SAO (Russia)…

Astrophysics · Physics 2009-11-10 A. I. Shapovalova , V. T. Doroshenko , N. G. Bochkarev , A. N. Burenkov. L. Carrasco , V. H. Chavushyan , S. Collin , J. R. Valdes , N. Borisov , A-M. Dumont , V. V. Vlasuyk , I. Chillingarian , I. S. Fioktistova , O. M. Martinez

A novel approach to study the variability of NGC 5548

Understanding the properties of the continuum radiation and broad emission lines of active galactic nuclei provide significant information not only to model the radiation mechanism and constrain the geometry and kinematics of the broad-line…

Astrophysics of Galaxies · Physics 2019-07-17 A. Bewketu Belete , L. J. Goicoechea , I. C. Leao , B. L. Canto Martins , J. R. De Medeiros

Evidence for periodicity in 43 year-long monitoring of NGC 5548

We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 H$\beta$ spectra and analyzed…

High Energy Astrophysical Phenomena · Physics 2016-09-22 E. Bon , S. Zucker , H. Netzer , P. Marziani , N. Bon , P. Jovanović , A. I. Shapovalova , S. Komossa , C. M. Gaskell , L. Č. Popović , S. Britzen , V. H. Chavushyan , A. N. Burenkov , S. Sergeev , G. La Mura , J. R. Valdés , M. Stalevski

Ionization of the diffuse gas in galaxies: Hot low-mass evolved stars at work

We revisit the question of the ionization of the diffuse medium in late type galaxies, by studying NGC 891, the prototype of edge-on spiral galaxies. The most important challenge for the models considered so far was the observed increase of…

Astrophysics of Galaxies · Physics 2015-03-19 Nahiely Flores-Fajardo , Christophe Morisset , Grazyna Stasinska , Luc Binette

Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548

We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multi-wavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (\emph{BVRI}…

Astrophysics of Galaxies · Physics 2016-04-27 M. M. Fausnaugh , K. D. Denney , A. J. Barth , M. C. Bentz , M. C. Bottorff , M. T. Carini , K. V. Croxall , G. De Rosa , M. R. Goad , Keith Horne , M. D. Joner , S. Kaspi , M. Kim , S. A. Klimanov , C. S. Kochanek , D. C. Leonard , H. Netzer , B. M. Peterson , K. Schnulle , S. G. Sergeev , M. Vestergaard , W. -K. Zheng , Y. Zu , M. D. Anderson , P. Arevalo , C. Bazhaw , G. A. Borman , T. A. Boroson , W. N. Brandt , A. A. Breeveld , B. J. Brewer , E. M. Cackett , D. M. Crenshaw , E. Dalla Bonta , A. De Lorenzo-Caceres , M. Dietrich , R. Edelson , N. V. Efimova , J. Ely , P. A. Evans , A. V. Filippenko , K. Flatland , N. Gehrels , S. Geier , J. M. Gelbord , L. Gonzalez , V. Gorjian , C. J. Grier , D. Grupe , P. B. Hall , S. Hicks , D. Horenstein , T. Hutchison , M. Im , J. J. Jensen , J. Jones , J. Kaastra , B. C. Kelly , J. A. Kennea , S. C. Kim , K. T. Korista , G. A. Kriss , J. C. Lee , P. Lira , F. MacInnis , E. R. Manne-Nicholas , S. Mathur , I. M. McHardy , C. Montouri , R. Musso , S. V. Nazarov , R. P. Norris , J. A. Nousek , D. N. Okhmat , A. Pancoast , I. Papadakis , J. R. Parks , L. Pei , R. W. Pogge , J. -U. Pott , S. E. Rafter , H. -W. Rix , D. A. Saylor , J. S. Schimoia , M. Siegel , M. Spencer , D. Starkey , H. -I. Sung , K. G. Teems , T. Treu , C. S. Turner , P. Uttley , C. Villforth , Y. Weiss , J. -H. Woo , H. Yan , S. Young