Monitoring of active galacitc nuclei. 4: The Seyfert 1 galaxy NGC 4593

Details Monitoring of active galacitc nuclei. 4: The Seyfert 1 galaxy NGC 4593 Monitoring of active galacitc nuclei. 4: The Seyfert 1 galaxy NGC 4593

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284...33d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 33-43

Astronomy and Astrophysics

Astrophysics

23

Active Galactic Nuclei, Balmer Series, H Alpha Line, H Beta Line, Light Curve, Seyfert Galaxies, Astronomical Photometry, Cross Correlation, Optical Emission Spectroscopy, Time Series Analysis

Scientific paper

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 1990. 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 broad line regions (BLRs) known so far.

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