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For refcode 1993A&A...269...39W:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&A...269...39W Spectroscopic monitoring of active galactic nuclei II. The Seyfert-1 galaxy NGC 3516 I. Wanders, E. van Groningen, D. Alloin, I. Aretxaga, D. Axon, A.G. de Bruyn, J. Clavel, M. Dietrich, M.R. Goad, P. Gondhalekar, K. Horne, N. Jackson, W. Kollatschny, E. Laurikainen, A. Lawrence, J Masegosa, P.T. O'Brien, A. del Olmo, M.V. Penston, J. Perea, I. Perez, I. Perez-Fournon, J. J. Perry, A. Robinson, J.M. Rodriguez Espinosa, G.M. Stirpe, C. Tadhunter, R. Terlevich, S. Unger, S. J. Wagner and R. Williams Astronomiska observatoriet, Box 515,S-75120 Uppsala, Sweden Observatoire de Paris, Place Jules Janssen, F-92195 Meudon Principal Cedex, France Dpto. Fisica Teorica, C-XI, Univ. Autonoma de Madrid, E-28049 Madrid, Spain NRAL, Jodrell Bank, Macclesfield, Cheshire SKI1 9DL, United Kingdom Radiosterrewacht, Postbus 2, NL-7990 AA Dwingeloo. The Netherlands ESA Astrophysics Division, ESTEC, Postbus 299, NL-2200 AG Noordwijk, The Netherlands Universitats-Sternwarte, Geismarlandstrafle 11, W-3400 Gottingen, Germany Department of Physics and Astronomy, UCL, Gower Street, London WClE 6BT, United Kingdom Rutherford Appleton Laboratory, Chilton, Didcot, Berks OXl 0QX, United Kingdom Space Science Telescope Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, The Netherlands Turku University Observatory, Tuorla, SF-2l500 Piikkio, Finland Queen Mary College, University of London, Mile End Road, London El, United Kingdom Instituto de Astrofisica de Andalucia, Apartado 2144, E-l808O Granada, Spain Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, United Kingdom Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain Institute of Astronomy, Madingley Rd., Cambridge CB3 0HA, United Kingdom Osservatorio Astronomico di Bologna, Via Zamboni 33,140126 Bologna, Italy Department of Physics, Hounsfield Rd., Sheffield 53 73H, United Kingdom Landessternwarte, Konigstuhl, W-6900 Heidelberg, Germany Received August 26, accepted November 4,1992 Abstract, We present results of a five month spectroscopic monitoring campaign of the Seyfert-1 galaxy NGC 3516. Using a new calibration method and applying a correction for seeing differences during the various observations we can scale the spectra to each other with a much higher accuracy than hitherto achieved. NGC 3516 shows large amplitude variations on a time scale of several weeks. Asymmetric profile variations occur on the same time scale as the continuum variations. We show the presence of a varying dip on the blue wing of the H{beta} profile which is not present on the H{alpha} profile, and which corresponds to the absorption features previously seen in the UV emission lines of NGC 3516. From cross-correlation analysis we find a time lag of 14+/-2 days for the H{alpha} and 7+/-3 days for the H{beta} emission-line response to continuum variations. Key words: data analysis - galaxies: NGC 3516 - galaxies: Seyfert - lines: profile - spectroscopy
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