Research Papers in Physics and Astronomy

 

Authors

M. Dietrich, Landessternwarte Heidelberg, Heidelberg, Germany
Bradley M. Peterson, Ohio State UniversityFollow
P. Albrecht, UniversitaŽtssternwarte GoŽttingen, GoŽttingen, Germany
M. Altmann, Sternwarte der UniversitaŽt Bonn, Auf dem HuŽ gel 71, D-53121 Bonn, Germany
A.J. Barth, Department of Astronomy, University of California, Berkeley, CA
P.J. Bennie, University of St. Andrews, School of Physics and Astronomy, North Haugh, St. Andrews, Scotland, UK
R. Bertram, Lowell Observatory, Flagstaf, AZ
N.G. Bochkarev, Sternberg Astronomical Institute, Universitetskij Prospect, Moscow, Russia
H. Bock, Landessternwarte Heidelberg, KoŽnigstuhl, Heidelberg, Germany
J.M. Braun, Sternwarte der UniversitaŽt Bonn, Auf dem HuŽ gel 71, Bonn, Germany
A. Burenkov, Special Astrophysical Observatory, Russian Academy of Science, Nyzknij Arkhyz, Karachaj-Cherkess Republic, 357147, Russia
S. Collier, University of St. Andrews, School of Physics and Astronomy, North Haugh, St. Andrews, Scotland, UK
L.-Z. Fang, Department of Physics, University of Arizona, Tucson, AZ
O.P. Francis, University of Nebraska - Lincoln
A. V. Filippenko, University of California, BerkeleyFollow
C.B. Foltz, MMT Observatory, University of Arizona, Tucson, AZ
W. Gassler, UniversitaŽtssternwarte MuŽnchen, MuŽnchen, Germany
C. Martin Gaskell, University of Nebraska-LincolnFollow
M. Geffert, Sternwarte der UniversitaŽt Bonn, Bonn, Germany
K.K. Ghosh, Indian Institute of Astrophysics, Vainu Bappu Observatory, Kavalur, Alangayam, N.A.A. 635 701, T.N., India
R.W. Hilditch, University of St. Andrews, School of Physics and Astronomy, North Haugh, St. Andrews, Scotland, UK
R.K. Honeycutt, Department of Astronomy, Indiana University, Bloomington, IN
K. Horne, University of St. Andrews, School of Physics and Astronomy, North Haugh, St. Andrews, Scotland, UK
J.P. Huchra, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
Shai Kaspi, Tel Aviv UniversityFollow
M. Kummel, Landessternwarte Heidelberg, KoŽnigstuhl, Heidelberg, Germany
K.M. Leighly, Columbia Astrophysics Laboratory, Columbia University, New York, NY
D.C. Leonard, Department of Astronomy, University of California, Berkeley, CA
Yu. F. Malkov, Crimean Astrophysical Observatory, Crimea, Ukraine
V. Mikhailov, Special Astrophysical Observatory, Russian Academy of Science, Nyzknij Arkhyz, Karachaj-Cherkess Republic, Russia
H. Richard Miller, Georgia State UniversityFollow
A.C. Morrill, Center for Space Physics, Boston University, Boston, MA
J. Noble, Center for Automated Space Sciences, Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY
Paul T. O'Brien, University of LeicesterFollow
T.D. Oswalt, Department of Physics and Space Science, Florida Institute of Technology, Melbourne, FL
S.P. Pebley, University of Nebraska - Lincoln
M. Pfeiffer, Landessternwarte Heidelberg, KoŽnigstuhl, Heidelberg, Germany
V.I. Pronik, Crimean Astrophysical Observatory, Crimea, Ukraine
B.-C. Qian, Shanghai Observatory, The Chinese Academy of Sciences, Shanghai, China
J.W. Robertson, Department of Astronomy, Indiana University, Bloomington, IN
A. Robinson, Division of Physics and Astronomy, Department of Physical Science, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK
Kenneth S. Rumstay, Valdosta State UniversityFollow
J. Schmoll, Astrophysikalisches Institut Potsdam, Potsdam, Germany
S.G. Sergeev, Crimean Astrophysical Observatory, Crimea, Ukraine
E.A. Sergeeva, Crimean Astrophysical Observatory, Crimea, Ukraine
A.I. Shapovalova, Special Astrophysical Observatory, Russian Academy of Science, Nyzknij Arkhyz, Karachaj-Cherkess Republic, Russia
D.R. Skillman, Center for Basement Astrophysics, Laurel, MD
Stephanie A. Snedden, University of Nebraska-LincolnFollow
S. Soundararajaperumal, Indian Institute of Astrophysics, Vainu Bappu Observatory, Kavalur, Alangayam, India
G.M. Stirpe, Osservatorio Astronomica di Bologna, Bologna, Italy
J. Tao, Department of Physics and Space Science, Florida Institute of Technology, Melbourne, FL
G.W. Turner, Department of Astronomy, Indiana University, Bloomington, IN
R.M. Wagner, Lowell Observatory, Flagstaf, AZ
S.J. Wagner, Landessternwarte Heidelberg, Heidelberg, Germany
J.Y. Wei, Beijing Astronomical Observatory, Beijing, China
H. Wu, Beijing Astronomical Observatory, Beijing, China
W. Zheng, Center for Astrophysical Sciences, John Hopkins University, Baltimore, MD
Z.L. Zhou, Beijing Astronomical Observatory, Beijing, China

Date of this Version

4-1-1998

Comments

Published by University of Chicago Press; Astrophys. J. Suppl., 115, 185 (1998). Copyright 1998. Permission to use. http://www.journals.uchicago.edu/ApJ/issues.html

Abstract

Results of a ground-based optical monitoring campaign on 3C 390.3 in 1994-1995 are presented. The broadband fluxes (B, V , R, and I), the spectrophotometric optical continuum flux Fλ(5177 Å), integrated emission-line fluxes of Hα, Hβ, Hγ, He I λ5876, and He II λ4686 all show a nearly monotonic increase with episodes of milder short-term variations superposed. The amplitude of the continuum variations increases with decreasing wavelength (4400-9000 Å). The optical continuum variations follow the variations in the ultraviolet and X-ray with time delays, measured from the centroids of the crosscorrelation functions, typically around 5 days, but with uncertainties also typically around 5 days; zero time delay between the high-energy and low-energy continuum variations cannot be ruled out. The strong optical emission lines Hα, Hβ, Hγ, He I λ5876 respond to the high-energy continuum variations with time delays typically about 20 days, with uncertainties of about 8 days. There is some evidence that He II λ4686 responds somewhat more rapidly, with a time delay of around 10 days, but again, the uncertainties are quite large (~8 days). The mean and rms spectra of the Hα and Hβ line profiles provide indications for the existence of at least three distinct components located at ±4000 and 0 km s-1 relative to the line peak. The emission-line proÐle variations are largest near line center.

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