A
Alla I. Shapovalova
Researcher at Special Astrophysical Observatory
Publications - 106
Citations - 3721
Alla I. Shapovalova is an academic researcher from Special Astrophysical Observatory. The author has contributed to research in topics: Active galactic nucleus & Galaxy. The author has an hindex of 37, co-authored 106 publications receiving 3560 citations. Previous affiliations of Alla I. Shapovalova include Sternberg Astronomical Institute & Russian Academy of Sciences.
Papers
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Journal ArticleDOI
Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. II - An intensive study of NGC 5548 at optical wavelengths
Bradley M. Peterson,Bradley M. Peterson,Thomas J. Balonek,Edwin S. Barker,Jill Bechtold,R. Bertram,R. Bertram,N. G. Bochkarev,M. J. Bolte,M. J. Bolte,D. Bond,T. A. Boroson,M. T. Carini,T. E. Carone,T. E. Carone,J. A. Christensen,S. D. Clements,Anita L. Cochran,Ross D. Cohen,David Crampton,M. Dietrich,Martin Elvis,A. Ferguson,A. Ferguson,Alexei V. Filippenko,Klaus J. Fricke,C. M. Gaskell,Jules P. Halpern,John P. Huchra,J. B. Hutchings,Wolfram Kollatschny,A. P. Koratkar,A. P. Koratkar,Kirk T. Korista,Kirk T. Korista,Julian H. Krolik,N. J. Lame,Ari Laor,R. J. Leacock,Gordon M. MacAlpine,M. A. Malkan,D. Maoz,H. R. Miller,Simon L. Morris,Hagai Netzer,C. L. M. Oliveira,Jeffrey Penfold,M. V. Penston,Enrique Pérez,Richard W. Pogge,Richard W. Pogge,M. W. Richmond,W. Romanishin,E. I. Rosenblatt,E. I. Rosenblatt,Leslie Saddlemyer,A. C. Sadun,S. R. Sawyer,Joseph C. Shields,Alla I. Shapovalova,Alex G. Smith,Horace A. Smith,Paul S. Smith,Wei-Hsin Sun,Wei-Hsin Sun,U. Thiele,T. J. Turner,Sylvain Veilleux,Sylvain Veilleux,R. M. Wagner,R. M. Wagner,Ray J. Weymann,Belinda Jane Wilkes,Beverley J. Wills,Derek Wills,P. F. Younger +75 more
TL;DR: In this paper, a large-scale ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign is described.
Journal ArticleDOI
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A 13 Year Study of Spectral Variability in NGC 5548
Bradley M. Peterson,Perry Berlind,R. Bertram,R. Bertram,K. Bischoff,N. G. Bochkarev,N. V. Borisov,A. N. Burenkov,A. N. Burenkov,Michael L. Calkins,L. Carrasco,V. H. Chavushyan,Ryan Chornock,Matthias Dietrich,V. T. Doroshenko,O. V. Ezhkova,Alexei V. Filippenko,Andrea M. Gilbert,John P. Huchra,Wolfram Kollatschny,Douglas C. Leonard,Douglas C. Leonard,Weidong Li,V. M. Lyuty,Yu. F. Malkov,Thomas Matheson,Thomas Matheson,N. I. Merkulova,V. P. Mikhailov,Maryam Modjaz,Maryam Modjaz,Christopher A. Onken,R. W. Pogge,V. I. Pronik,B.-C. Qian,P. Romano,Sergey G. Sergeev,E. A. Sergeeva,Alla I. Shapovalova,Alla I. Shapovalova,O. I. Spiridonova,J. Tao,Susan Tokarz,José R. Valdés,V. V. Vlasiuk,R. M. Wagner,R. M. Wagner,Belinda Jane Wilkes +47 more
TL;DR: In this paper, the authors 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.
Journal ArticleDOI
Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XIV. Intensive Optical Spectrophotometric Observations of NGC 7469
Stefan Collier,Stefan Collier,Keith Horne,Shai Kaspi,Hagai Netzer,Bradley M. Peterson,Ignaz Wanders,Ignaz Wanders,Tal Alexander,R. Bertram,R. Bertram,Andrea Comastri,C. M. Gaskell,Yu. F. Malkov,D. Maoz,M. Mignoli,Richard W. Pogge,V. I. Pronik,S. G. Sergeev,Stephanie A. Snedden,G. M. Stirpe,N. G. Bochkarev,A. N. Burenkov,Alla I. Shapovalova,R. M. Wagner,R. M. Wagner +25 more
TL;DR: In this paper, the authors present results of an intensive 2 month campaign of ground-based spectrophotometric monitoring of the Seyfert 1 galaxy NGC 7469, with a temporal resolution 1 day.
Journal ArticleDOI
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC 7469
Ignaz Wanders,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,Hagai Netzer,P. T. O'Brien,Gail A. Reichert,P. M. Rodríguez-Pascual,Willem Wamsteker,Tal Alexander,Tal Alexander,K. S. J. Anderson,Erika Benítez,N. G. Bochkarev,Alexander N. Burenkov,FZ Cheng,Stefan Collier,Andrea Comastri,M. Dietrich,D. Dultzin-Hacyan,Brian R. Espey,Alexei V. Filippenko,C. M. Gaskell,Ian M. George,Ian M. George,M. R. Goad,Luis C. Ho,Shai Kaspi,Wolfram Kollatschny,Kirk T. Korista,Ari Laor,Gordon M. MacAlpine,M. Mignoli,Simon L. Morris,K. Nandra,K. Nandra,Steve Penton,Richard 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,T. J. Turner,M. H. Ulrich,Tinggui Wang,C. Wei,W. F. Welsh,SJ Xue,Z.-L. Zou +61 more
TL;DR: In this article, 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
The First Spectroscopically Resolved Sub-parsec Orbit of a Supermassive Binary Black Hole
Edi Bon,Predrag Jovanović,Paola Marziani,Paola Marziani,Alla I. Shapovalova,N. Bon,V. Borka Jovanović,V. Borka Jovanović,Duško Borka,Duško Borka,J. W. Sulentic,Luka Č. Popović +11 more
TL;DR: In this paper, the authors presented an observational evidence for the first spectroscopically resolved sub-parsec orbit of a supermassive binary black hole system in the core of Seyfert galaxy NGC 4151.