1999A&A...345..760P


Query : 1999A&A...345..760P

1999A&A...345..760P - Astronomy and Astrophysics, volume 345, 760-768 (1999/5-3)

OJ 287 and the predicted fade of 1998.

PIETILAE H., TAKALO L.O., TOSTI G., BENITEZ E., CHIATTELLI B., CORRADI R.L.M., COX G., DE DIEGO J.A., DE FRANCESCO G., DULTZIN-HACYAN D., HEINAEMAEKI P., KATAJAINEN S., KEINAENEN P., KORHONEN H., KOTILAINEN J., LAINELA M., LICANDRO J., LUCIANI M., NILSSON K., PURSIMO T., RAITERI C.M., REKOLA R., SILLANPAEAE A., SOBRITO G., TERAESRANTA H., VILLATA M. and ZURITA A.

Abstract (from CDS):

There were predictions that blazar OJ 287 should have faded in late 1997 or early 1998. The observational background for these predictions is the sudden fade of OJ 287 in 1989. Back then, the radio flux decreased steadily for 4-5 months and then the brightness dropped also in the optical region suddenly for 2-3 weeks to all time low values, e.g. V=17.4mag. The predictions are based on a binary black hole model, where the companion black hole and its accretion disk eclipse the emission areas of the primary black hole. We have made observations of OJ 287 during the time of the predicted fade. The results show that, in the optical, OJ 287 starts to fade almost linearly in December 1997 until mid-February 1998, when it suddenly shows a sharp rise and sharp fade, and starts to get brighter again. The radio observations show no signs of variability, but the radio flux has been very low since the 1995 outburst. We also have earlier observations since Fall 1993 to Spring 1998, which show that the local minimum reached in February 1998 was the lowest since 1995. We have made observations with several telescopes in the optical (UBVRI) and radio (22 and 37GHz) bands. We discuss the various events in the light curves and their implications on the proposed models, especially the binary black hole model by Lehto & Valtonen (1996ApJ...460..207L) which was used to make the prediction of the time of the fade.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: individual: OJ 287 - galaxies: quasars: general - black hole physics

Simbad objects: 2

goto View the references in ADS

Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2169 1
2 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 1001 0

To bookmark this query, right click on this link: simbad:objects in 1999A&A...345..760P and select 'bookmark this link' or equivalent in the popup menu


2022.06.27-17:51:05

© Université de Strasbourg/CNRS

    • Contact