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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Multiwavelength observations of short-timescale variability in NGC 4151. I. ultraviolet observations
Astrophysical Journal, Volume 470, No. 1 PART I, Year 1996
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Description
We present the results of an intensive ultraviolet monitoring campaign on the Seyfert 1 galaxy NGC 4151, as part of an effort to study its short-timescale variability over a broad range in wavelength. The nucleus of NGC 4151 was observed continuously with the International Ultraviolet Explorer for 9.3 days, yielding a pair of LWP and SWP spectra every ~70 minutes, and during 4 hr periods for 4 days prior to and 5 days after the continuous-monitoring period. The sampling frequency of the observations is an order of magnitude higher than that of any previous UV monitoring campaign on a Seyfert galaxy. The continuum fluxes in bands from 1275 to 2688 A went through four significant and well-defined " events " of duration 2-3 days during the continuous-monitoring period. We find that the amplitudes of the continuum variations decrease with increasing wavelength, which extends a general trend for this and other Seyfert galaxies to smaller timescales (i.e., a few days). The continuum variations in all the UV bands are simultaneous to within an accuracy of ∼0.15 days, providing a strict constraint on continuum models. The emission-line light curves show only one major event during the continuous monitoring (a slow rise followed by a shallow dip) and do not correlate well with continuum light curves over the short duration of the campaign, because the timescale for continuum variations is apparently smaller than the response times of the emission lines. © 1996. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Crenshaw, D. Michael
United States, Falls Church
Computer Sciences Corporation - Usa
Penton, Steven Victor
United States, Boulder
University of Colorado Boulder
Alloin, Danielle
France, Paris
L'observatoire de Paris
Clavel, Jean
United Kingdom, St Andrews
University of st Andrews
Hörne, Keith D.
Israel, Tel Aviv-yafo
Tel Aviv University
Johnson, William Neil
United States, Washington, D.c.
U.s. Naval Research Laboratory
Kaspi, Shai S.
United States, Lexington
University of Kentucky
Korista, Kirk T.
United States, Baltimore
Johns Hopkins University
Kriss, Gerard A.
United States, Los Angeles
University of California, Los Angeles
Krolik, Julian H.
United Kingdom, Oxford
University of Oxford
Malkan, Matthew A.
United States, Columbus
The Ohio State University
Maoz, Dan
United States, Iowa City
University of Iowa
Netzer, Hagai
United States, Falls Church
Computer Sciences Corporation - Usa
O'Brien, Paul T.
United States, Boulder
University of Colorado Boulder
Peterson, Bradley M.
Spain, Madrid
European Space Astronomy Centre
Reichert, Gail A.
United States, Boulder
University of Colorado Boulder
Shull, J. Michael
United Kingdom, St Andrews
University of st Andrews
Ulrich, Marie Helene
Israel, Tel Aviv-yafo
Tel Aviv University
Wamsteker, Willem
United States, Washington, D.c.
U.s. Naval Research Laboratory
Robert S. Warwick, Robert S.
United Kingdom, St Andrews
University of st Andrews
Balonek, Thomas J.
United States, Boulder
University of Colorado Boulder
Barr, Paul
Spain, Madrid
European Space Astronomy Centre
Bromage, Gordon E.
United States, Falls Church
Computer Sciences Corporation - Usa
Carini, Michael T.
United States, Iowa City
University of Iowa
Carone, Timothy E.
Spain, Madrid
European Space Astronomy Centre
Cheng, Fuzhen
United States, Falls Church
Computer Sciences Corporation - Usa
Chuvaev, K. K.
Spain, Madrid
European Space Astronomy Centre
Dietrich, Matthias
United States, Lexington
University of Kentucky
Doroshenko, V. T.
United States, Baltimore
Johns Hopkins University
Dultziń-Hacyan, Deborah
United States, Los Angeles
University of California, Los Angeles
Filippenko, Alexei V.
United States, Columbus
The Ohio State University
Gaskell, C. Martin
United Kingdom, Oxford
University of Oxford
Glass, Ian S.
United States, Baltimore
Johns Hopkins University
Goad, Michael R.
United Kingdom, Oxford
University of Oxford
Hutchings, John B.
United States, Columbus
The Ohio State University
Kazanas, Demosthenes
Spain, Madrid
European Space Astronomy Centre
Kollatschny, Wolfram
France, Paris
L'observatoire de Paris
Koratkar, Anuradha P.
Netherlands, Noordwijk Aan Zee
Estec - European Space Research and Technology Centre
Laor, Ari
United Kingdom, St Andrews
University of st Andrews
Leighly, Karen Marie
United States, Washington, D.c.
U.s. Naval Research Laboratory
MacAlpine, Gordon M.
United States, Lexington
University of Kentucky
Malkov, Yu F.
United States, Baltimore
Johns Hopkins University
Martin, Peter G.
United Kingdom, Oxford
University of Oxford
McCollum, Bruce
United States, Columbus
The Ohio State University
Merkulova, Nelly I.
United States, Baltimore
Johns Hopkins University
Metik, L. P.
United States, Lexington
University of Kentucky
Metlov, Vladimir G.
Israel, Tel Aviv-yafo
Tel Aviv University
Miller, Hugh Richard
United States, Washington, D.c.
U.s. Naval Research Laboratory
Morris, Simon L.
United Kingdom, St Andrews
University of st Andrews
Penfold, J. E.
United States, Los Angeles
University of California, Los Angeles
Pérez, Enrique
United Kingdom, Oxford
University of Oxford
Perola, Giuseppe Cesare
United States, Iowa City
University of Iowa
Pogge, Richard W.
United States, Iowa City
University of Iowa
Pronik, I. I.
United States, Falls Church
Computer Sciences Corporation - Usa
Pronik, Vladimir I.
Spain, Madrid
European Space Astronomy Centre
Ptak, R. L.
United States, Boulder
University of Colorado Boulder
Recondo, Carmen
United States, Washington, D.c.
U.s. Naval Research Laboratory
Sadun, Alberto C.
United States, Falls Church
Computer Sciences Corporation - Usa
Salamanca, Isabel M.
Spain, Madrid
European Space Astronomy Centre
Santos-Lleó, María
United Kingdom, St Andrews
University of st Andrews
Sergeev, Sergey G.
United States, Falls Church
Computer Sciences Corporation - Usa
Smith, S. M.
United States, Baltimore
Johns Hopkins University
Snijders, M. A.J.
Spain, Madrid
European Space Astronomy Centre
Sparke, Linda S.
Spain, Madrid
European Space Astronomy Centre
Stirpe, G. M.
United States, Falls Church
Computer Sciences Corporation - Usa
Sun, Wei-Hsin
United States, Iowa City
University of Iowa
van Groningen, Ernst
United States, Los Angeles
University of California, Los Angeles
Wagner, Ryan Mark
United States, Los Angeles
University of California, Los Angeles
Wagner, Stefan J.
United Kingdom, Oxford
University of Oxford
Welsh, William F.
United States, Boulder
University of Colorado Boulder
Weymann, Ray J.
United States, Iowa City
University of Iowa
Wilkes, Belinda J.
United States, Los Angeles
University of California, Los Angeles
Zheng, Wei
France, Paris
L'observatoire de Paris
Statistics
Citations: 64
Authors: 73
Affiliations: 14
Identifiers
Doi:
10.1086/177869
ISSN:
0004637X
Research Areas
Environmental