2000A&AS..146..141P

Query : 2000A&AS..146..141P

2000A&AS..146..141P - Astron. Astrophys., Suppl. Ser., 146, 141-155 (2000/October-1)

Intensive monitoring of OJ 287.

PURSIMO T., TAKALO L.O., SILLANPAEAE A., KIDGER M., LEHTO H.J., HEIDT J., CHARLES P.A., ALLER H., ALLER M., BECKMANN V., BENITEZ E., BOCK H., BOLTWOOD P., BORGEEST U., DE DIEGO J.A., DE FRANCESCO G., DIETRICH M., DULTZIN-HACYAN D., EFIMOV Yu., FIORUCCI M., GHISELLINI G., GONZALEZ-PEREZ J.N., HANSKI M., HEINAEMAEKI P., HONEYCUTT R.K., HUGHES P., KARLAMAA K., KATAJAINEN S., KNEE L.B.G., KURTANIDZE O.M., KUEMMEL M., KUEHL D., LAINELA M., LANTERI L., VON LINDE J., LAEHTEENMAEKI A., MAESANO M., MAHONEY T., MARCHENKO S., MARSCHER A., MASSARO E., MONTAGNI F., NESCI R., NIKOLASHVILI M., NILSSON K., NURMI P., PIETILAE H., POYNER G., RAITERI C.M., REKOLA R., RICHTER G.M., RIEHOKAINEN A., ROBERTSON J.W., RODRIGUEZ-ESPINOZA J.M., SADUN A., SHAKHOVSKOY N., SCHRAMM K.J., SCHRAMM T., SOBRITO G., TEERIKORPI P., TERAESRANTA H., TORNIKOSKI M., TOSTI G., TURNER G.W., VALTAOJA E., VALTONEN M., VILLATA M., WAGNER S.J., WEBB J., WENEIT W. and WIREN S.

Abstract (from CDS):

We present intensive optical, infrared, and radio monitoring observations of the BL Lac object OJ 287, taken between the years 1993-1998. Two large optical outbursts were detected at the predicted times in November 1994 and December 1995. The detection of these outbursts supports the binary black hole model for OJ 287. Optical and radio polarisation observations show large variability in the degree of polarisation and position angle, very similar to those observed during the 1983/84 outburst in OJ 287. The polarisation position angles show very similar behaviour during these observations, indicating that, at least, the magnetic field orientations in radio and optical bands are related in OJ 287. Optical and infrared light curves show continuous variability in time scales ranging from tens of minutes to years. In the radio bands we have observed some of the lowest ever measured flux levels. During the first optical outburst in November 1994 the observed radio flux was very low, but during the second optical outburst radio bands also showed high flux levels. This is a puzzling observation, which can hopefully be used for discriminating between different outburst models. On top of the large outbursts OJ 287 has displayed flaring activity in time scales from days to weeks and shorter time scale flickering.

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Journal keyword(s): BL Lac objects - OJ 287 - photometry

VizieR on-line data: <Available at CDS (J/A+AS/146/141): table1.dat-table7.dat>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
2 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
3 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
4 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
5 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1
6 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
7 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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