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Date and Time of the Query: 2019-06-25 T19:36:34 PDT
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For refcode 1994A&A...284...33D:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...284...33D Monitoring of active galactic nuclei IV. The Seyfert 1 galaxy NGC 4593 M. Dietrich, W. Kollatschny, D. Alloin, I. Aretxaga, D. Axon, A. G. de Bruyn, J. Clavel, M. R. Goad, P. Gondhalekar, E. van Groningen, K. Horne, N. Jackson, E. Laurikainen, A. Lawrence, J. Masegosa M. Moles, P. O'Brien, A. del Olmo, M. V. Penston, J. Perea, E. Perez, I. Perez-Fournon, J. J. Perry, B. M. Peterson, A. Robinson, J. M. Rodriguez Espinosa, G. M. Stirpe, C. Tadhunter, R. Terlevich, S. Unger, S. J. Wagner, I. Wanders, and R. Williams Universitats-Sternwarte, Geismarlandstrasse 11, D-37083 Gottingen, Germany Observatoire de Paris, URA 173 CNRS, Universite Paris 7, Place Jules Janssen, F-92195 Meudon Principal Cedex, France Dpto. Fisica Teorica, C-XI, Universidad Autdnoma de Madrid, E-28049 Madrid, Spain NRAL, Jodrell Bank, Macclesfield, Cheshire SKll 9DL, UK Radiosterrewacht, Postbus 2, NL-7990 AA Dwingeloo, The Netheriands ESA Astrophysics Division, ESTEC, Postbus 299, ~2200 AG Noordwijk, The Netherlands Department of Physics and Astronomy, UCL, Gower Street, London WC1E 6BT, UK Rutherford Appleton Laboratory, Chilton, Didcot, Berks OX1 0QX, UK Astronomiska observatoriet, Box 515,5-75120 Uppsala, Sweden Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Sterrewacht Lieiden, 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, UK Instituto de Astrofisica de Andalucia, CSIC, Apartado 3004, E-Granada, Spain Royal Greenwich Observatory, Madingley Road, Cambridge CB3 OEZ, UK Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain Institute of Astronomy, Madingley Rd., Cambridge CB3 0HA, UK Department of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210, USA Osservatorio Astronomico di Bologna, Via Zamboni 33, I-40126 Bologna, Italy Department of Physics, Hounsfield Rd., Sheffield S3 73H, UK Landessternwarte Konigstuhl, D-69117 Heidelberg, Germany Received 23 February 1993 / Accepted 30 September 1993 Abstract. Results of a five-month campaign of optical monitoring the Seyfert 1 galaxy NGC 4593 are presented. High resolution H{alpha} and H{beta} spectra and direct images in the Johnson U, B, V, R and I bands were obtained between January and June The emission lines and the continuum showed strong variations on time scales of weeks to days. The H{alpha} line varied by more than 30% within only 5 days. Cross- correlating the light curves of the Balmer lines with that of the optical continuum gives a lag of around 4 days. Therefore, this low luminosity Seyfert galaxy may have one of the smallest BLRs known so far. Key words: galaxies: individual: NGC 4593 - galaxies: Seyfert - lines: profile
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