Monitoring of active galactic nuclei. IV. The Seyfert 1 galaxy NGC 4593
1994 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 284, no 1, 33-4343 p.Article in journal (Refereed) Published
Results of a five-month campaign of optical monitoring the Seyfert 1 galaxy NGC 4593 are presented. High resolution Halpha and Hbeta 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 Halpha 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 known so far
Place, publisher, year, edition, pages
1994. Vol. 284, no 1, 33-4343 p.
Experimental/ astronomical photometry, astronomical spectra, Seyfert galaxies, visible astronomical observations/ Seyfert 1 galaxy, NGC 4593, optical monitoring, active galactic nucleus, Hbeta spectral line, direct images, Johnson UBVRI bands, AD 1990 01 to 06, emission lines, optical continuum variations, Halpha line, light curves, Balmer lines, visible, low luminosity Seyfert galaxy, broad line region size, 450 to 540 nm, 620 to 720 nm, H/ A9850R Active and peculiar galaxies A9580J Photographic region astronomical observations A9850G Radiation and spectra of galaxies/ wavelength 4.5E-07 to 5.4E-07 m, wavelength 6.2E-07 to 7.2E-07 m/ H/el
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-197168ISI: 4665399OAI: oai:DiVA.org:uu-197168DiVA: diva2:611952