MONITORING OF ACTIVE GALACTIC NUCLEI .4. THE SEYFERT-1 GALAXY NGC-4593

Authors
DIETRICH M KOLLATSCHNY W ALLOIN D ARETXAGA I AXON D DEBRUYN AG CLAVEL J GOAD MR GONDHALEKAR P VANGRONINGEN E HORNE K JACKSON N LAURIKAINEN E LAWRENCE A MASEGOSA J MOLES M OBRIEN P DELOLMO A PENSTON MV PEREA J PEREZ E PEREZFOURNON I PERRY JJ PETERSON BM ROBINSON A ESPINOSA JMR STIRPE GM TADHUNTER C TERLEVICH R UNGER S WAGNER SJ WANDERS I WILLIAMS R
Citation
M. Dietrich et al., MONITORING OF ACTIVE GALACTIC NUCLEI .4. THE SEYFERT-1 GALAXY NGC-4593, Astronomy and astrophysics, 284(1), 1994, pp. 33-43
Citations number
41
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
284
Issue
1
Year of publication
1994
Pages
33 - 43
Database
ISI
SICI code
0004-6361(1994)284:1<33:MOAGN.>2.0.ZU;2-6
Abstract
Results of a five-month campaign of optical monitoring the Seyfert 1 g alaxy 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 s howed strong variations on time scales of weeks to days. The Halpha li ne varied by more than 30 % within only 5 days. Cross-correlating the light curves of the Balmer lines with that of the optical continuum gi ves a lag of around 4 days. Therefore, this low luminosity Seyfert gal axy may have one of the smallest BLRs known so far.