Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 143, Number 3, May I 2000
Page(s) 357 - 368
DOI https://doi.org/10.1051/aas:2000184
Published online 15 May 2000
DOI: 10.1051/aas:2000184

Astron. Astrophys. Suppl. Ser. 143, 357-368

Tuorla quasar monitoring[*]

I. Observations of 1995-1997

S. Katajainen1 - L.O. Takalo1 - A. Sillanpää1 - K. Nilsson1 - T. Pursimo1 - M. Hanski1 - P. Heinämäki1 - E. Kotoneva1 - M. Lainela1 - P. Nurmi1 - H. Pietilä1 - R. Rekola1 - A. Riehokainen1 - P. Teerikorpi1 - E. Valtaoja1,2 - A. Lähteenmäki2

Send offprint request: S. Katajainen,
e-mail: sekataja@astro.utu.fi


1 - Tuorla Observatory, Väisäläntie 20, FIN-21500 Piikkiö, Finland
2 - Metsähovi Radio Observatory, Helsinki University of Technology, FIN-02540 Kylmälä, Finland

Received March 30; accepted November 26, 1999

Abstract:

We present results of optical monitoring of quasars and blazars obtained at Tuorla Observatory between September 1995 and May 1997. The aim of our monitoring is to provide well sampled optical light curves for quasar and blazar studies. During the observing period the V-band brightness of S2 0109+224, 3C 66A, and ON 231 (W Comae) reached some of the brightest values ever measured for these objects. A strong outburst was observed in Mrk 421 and the large outburst, which was predicted earlier, in OJ 287 was confirmed. CTA 102 had over one magnitude outburst which happened in a timescale of a few days. For OI 090.4 we measured one of the faintest V-band brightness values ever.

Key words: galaxies: active -- BL Lacertae objects: general -- quasars: general

SIMBAD Objects
Tables at the CDS

Copyright The European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.