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Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548

Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and the X-rays. This is the densest extended AGN UV/optical continuum sampling ever obtained, with a mean…

星系天体物理 · 物理学 2015-07-10 R. Edelson , J. M. Gelbord , K. Horne , I. M. McHardy , B. M. Peterson , P. Arevalo , A. A. Breeveld , G. De Rosa , P. A. Evans , M. R. Goad , G. A. Kriss , W. N. Brandt , N. Gehrels , D. Grupe , J. A. Kennea , C. S. Kochanek , J. A. Nousek , I. Papadakis , M. Siegel , D. Starkey , P. Uttley , S. Vaughan , S. Young , A. J. Barth , M. C. Bentz , B. J. Brewer , D. M. Crenshaw , E. Dalla Bonta , A. De Lorenzo-Caceres , K. D. Denney , M. Dietrich , J. Ely , M. M. Fausnaugh , C. J. Grier , P. B. Hall , J. Kaastra , B. C. Kelly , K. T. Korista , P. Lira , S. Mathur , H. Netzer , A. Pancoast , L. Pei , R. W. Pogge , J. S. Schimoia , T. Treu , M. Vestergaard , C. Villforth , H. Yan , Y. Zu

A hard look at thermal reverberation and optical/UV lags in NGC 5548

The UV/optical variations in many AGN are very well correlated, showing delays which increase with increasing wavelength. It is thought that this is due to thermal reprocessing of the X-ray emission by the accretion disk. In this scenario,…

高能天体物理现象 · 物理学 2019-07-17 E. S. Kammoun , I. E. Papadakis , M. Dovciak

Simultaneous X-ray and Ultraviolet spectroscopy of the Seyfert galaxy NGC 5548. III. X-ray time variability

The Seyfert 1 galaxy NGC 5548 was observed for a week by Chandra using both the HETGS and LETGS spectrometers. In this paper we study the time variability of the continuum radiation. During our observation, the source showed a gradual…

天体物理学 · 物理学 2009-11-10 J. S. Kaastra , K. C. Steenbrugge , D. M. Crenshaw , S. B. Kraemer , N. Arav , I. M. George , D. A. Liedahl , R. L. J. van der Meer , F. B. S. Paerels , T. J. Turner , T. Yaqoob

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…

星系天体物理 · 物理学 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

We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the relationship between the optical and X-ray continua. The…

天体物理学 · 物理学 2009-11-07 Phil Uttley , Rick Edelson , Ian McHardy , Bradley M. Peterson , Alex Markowitz

Anatomy of the AGN in NGC 5548: VII. Swift study of obscuration and broadband continuum variability

We present our investigation into the long-term variability of the X-ray obscuration and optical-UV-X-ray continuum in the Seyfert 1 galaxy NGC 5548. In 2013 and 2014, the Swift observatory monitored NGC 5548 on average every day or two,…

高能天体物理现象 · 物理学 2016-04-06 M. Mehdipour , J. S. Kaastra , G. A. Kriss , M. Cappi , P. -O. Petrucci , B. De Marco , G. Ponti , K. C. Steenbrugge , E. Behar , S. Bianchi , G. Branduardi-Raymont , E. Costantini , J. Ebrero , L. Di Gesu , G. Matt , S. Paltani , B. M. Peterson , F. Ursini , M. Whewell

Tests for Standard Accretion Disk Models by Variability in Active Galactic Nuclei

In this paper, standard accretion disk models of AGNs are tested using light curves of 26 objects well observed for reverberation mapping. Time scales of variations are estimated by the most common definition of the variability time scale…

天体物理学 · 物理学 2014-01-10 H. T. Liu , J. M. Bai , X. H. Zhao , L. Ma

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…

天体物理学 · 物理学 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

The origin of the UV/optical lags in NGC 5548

The new multi-wavelength monitoring campaign on NGC 5548 shows clearly that the variability of the UV/optical lightcurves lags by progressively longer times at longer wavelengths, as expected from reprocessing of an optically thick disk,…

高能天体物理现象 · 物理学 2017-10-11 Emma Gardner , Chris Done

A model of the broad-band continuum of NGC 5548

We discuss a model of the central source in Seyfert 1 galaxy NGC 5548. The model assumes a three phase disk structure consisting of a cold outer disk, a hot central disk constituting a Comptonizing X/gamma source, and an intermediate…

天体物理学 · 物理学 2007-05-23 P. Magdziarz , O. Blaes

Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies

The most intense monitoring observations yet made in the optical (UBV) and near-infrared (JHK) wave bands were carried out for nearby Seyfert1 galaxies of NGC 5548, NGC 4051, NGC 3227, and NGC 7469. Over three years of observations with…

天体物理学 · 物理学 2009-11-13 M. Suganuma , Y. Yoshii , Y. Kobayashi , T. Minezaki , K. Enya , H. Tomita , T. Aoki , S. Koshida , B. A. Peterson

The Lick AGN Monitoring Project: Photometric Light Curves and Optical Variability Characteristics

The Lick AGN Monitoring Project targeted 13 nearby Seyfert 1 galaxies with the intent of measuring the masses of their central black holes using reverberation mapping. The sample includes 12 galaxies selected to have black holes with masses…

宇宙学与河外天体物理 · 物理学 2014-11-20 Jonelle L. Walsh , Takeo Minezaki , Misty C. Bentz , Aaron J. Barth , Nairn Baliber , Weidong Li , Daniel Stern , Vardha Nicola Bennert , Timothy M. Brown , Gabriela Canalizo , Alexei V. Filippenko , Elinor L. Gates , Jenny E. Greene , Matthew A. Malkan , Yu Sakata , Rachel A. Street , Tommaso Treu , Jong-Hak Woo , Yuzuru Yoshii

Using Multiwavelength Observations to Determine the Black Hole Mass and Accretion Rate in the Type 1 Seyfert Galaxy NGC 5548

We model the spectral energy distribution of the type 1 Seyfert galaxy NGC 5548, fitting data from simultaneous optical, UV, and X-ray monitoring observations. We assume a geometry consisting of a hot central Comptonizing region surrounded…

天体物理学 · 物理学 2009-11-07 James Chiang , Omer Blaes

Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability

Lags measured from correlated X-ray/UV/optical monitoring of AGN allow us to determine whether UV/optical variability is driven by reprocessing of X-rays or X-ray variability is driven by UV/optical seed photon variations. We present the…

高能天体物理现象 · 物理学 2015-06-22 I. M. McHardy , D. T. Cameron , T. Dwelly , S. Connolly , P. Lira , D. Emmanoulopoulos , J. Gelbord , E. Breedt , P. Arevalo , P. Uttley

Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope

We describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 170 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space Telescope.…

星系天体物理 · 物理学 2015-07-10 G. De Rosa , B. M. Peterson , J. Ely , G. A. Kriss , D. M. Crenshaw , Keith Horne , K. T. Korista , H. Netzer , R. W. Pogge , P. Arevalo , A. J. Barth , M. C. Bentz , W. N. Brandt , A. A. Breeveld , B. J. Brewer , E. Dalla Bonta , A. De Lorenzo-Caceres , K. D. Denney , M. Dietrich , R. Edelson , P. A. Evans , M. M. Fausnaugh , N. Gehrels , J. M. Gelbord , M. R. Goad , C. J. Grier , D. Grupe , P. B. Hall , J. Kaastra , B. C. Kelly , J. A. Kennea , C. S. Kochanek , P. Lira , S. Mathur , I. M. McHardy , J. A. Nousek , A. Pancoast , I. Papadakis , L. Pei , J. S. Schimoia , M. Siegel , D. Starkey , T. Treu , P. Uttley , S. Vaughan , M. Vestergaard , C. Villforth , H. Yan , S. Young , Y. Zu

AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817

We fit the UV/optical lightcurves of the Seyfert 1 galaxy Mrk 817 to produce maps of the accretion disk temperature fluctuations $\delta T$ resolved in time and radius. The $\delta T$ maps are dominated by coherent radial structures that…

高能天体物理现象 · 物理学 2023-10-04 Jack M. M. Neustadt , Christopher S. Kochanek , John Montano , Jonathan Gelbord , Aaron J. Barth , Gisella De Rosa , Gerard A. Kriss , Edward M. Cackett , Keith Horne , Erin A. Kara , Hermine Landt , Hagai Netzer , Nahum Arav , Misty C. Bentz , Elena Dalla Bonta , Maryam Dehghanian , Pu Du , Rick Edelson , Gary J. Ferland , Carina Fian , Travis Fischer , Michael R. Goad , Diego H. Gonzalez Buitrago , Varoujan Gorjian , Catherine J. Grier , Patrick B. Hall , Y. Homayouni , Chen Hu , Dragana Ilic , Michael D. Joner , Jelle Kaastra , Shai Kaspi , Kirk T. Korista , Andjelka B. Kovacevic , Collin Lewin , Yan-Rong Li , Ian M. McHardy , Missagh Mehdipour , Jake A. Miller , Christos Panagiotou , Ethan Partington , Rachel Plesha , Richard W. Pogge , Luka C. Popovic , Daniel Proga , Thaisa Storchi-Bergmann , David Sanmartim , Matthew R. Siebert , Matilde Signorini , Marianne Vestergaard , Fatima Zaidouni , Ying Zu

Models of optical/UV continuum in AGN. Constraints from NGC 5548 monitoring campaign

We analyse the data from the optical/IUE observational campaign of the Seyfert galaxy NGC 5548 in the context of 10 phenomenological models. On the basis of the optical/UV data as well as constraints from the X-ray observations we can…

天体物理学 · 物理学 2015-06-24 Z. Loska , B. Czerny

We present results of a 3-month combined X-ray/UV/optical monitoring campaign of the Seyfert 1 galaxy NGC 6814. The object was monitored by Swift from June through August 2012 in the X-ray and UV bands and by the Liverpool Telescope from…

星系天体物理 · 物理学 2016-01-20 Jon Troyer , David Starkey , Edward Cackett , Misty Bentz , Michael Goad , Keith Horne , James Seals

Complex optical/UV and X-ray variability in Seyfert 1 galaxy Mrk 509

We performed a detailed spectral and timing analysis of a Seyfert 1 galaxy Mrk 509 using data from the Neil Gehrels Swift observatory that spanned over ~13 years between 2006 and 2019. To study the variability properties from the optical/UV…

高能天体物理现象 · 物理学 2023-06-22 Neeraj Kumari , Main Pal , Sachindra Naik , Arghajit Jana , Gaurava K. Jaisawal , Pankaj kushwaha

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…

高能天体物理现象 · 物理学 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