J/A+AS/146/141 Intensive monitoring of OJ 287 (Pursimo+, 2000)
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., Wiren S.
<Astron. Astrophys. Suppl. Ser., 146, 141-155 (2000)>
=2000A&AS..146..141P 2000A&AS..146..141P (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry; Polarization; Radio continuum
Keywords: BL Lac objects - OJ 287 - photometry
Abstract:
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.
Description:
We present intensive optical, infrared, and radio monitoring
observations of the BL Lac object OJ 287, taken between the years
1993-1998. Most of the optical observations were taken using
CCD-cameras and the data were reduced using standard procedures, i.e.
bias and flat field corrections. For these data differential photometry
was performed using calibration stars (4,10,11) from (Smith et al.
1985AJ.....90.1184S 1985AJ.....90.1184S) or Fiorucci & Tosti (1996A&AS..116..403F 1996A&AS..116..403F, Cat.
J/A+AS/116/403).
All the optical polarisation observations were made using similar
UBVRI photopolarimeter both at Crimea and at the NOT. The infrared
data were collected mostly at the 1.5m Carlos Sanchez telescope on
Tenerife, using a single channel CVF-photometer with some additional
data from UKIRT.
The radio data are nightly averages collected within radio monitoring
programs at Michigan, Metsahovi, and SEST, with frequencies from 4.8
to 230GHz.
Small amount of UV data was obtained with the IUE-satellite during the
first outburst.
In addition we provide visual brightness estimates from amateur
astronomers.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
08 54 48.87 +20 06 30.6 OJ 287 = OHIO J 287
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 36 9888 Optical observations of OJ 287
table2.dat 35 242 NIR observations of OJ 287
table3.dat 38 1245 Radio flux density 5-375GHz observations of
OJ 287
table4.dat 37 7 IUE UV observations of OJ 287
table5.dat 53 437 Optical polarimetry observations of OJ 287
table6.dat 56 526 Radio polarimetry observations of OJ 287
table7.dat 35 134 Visual brightness estimates of OJ 287
--------------------------------------------------------------------------------
See also:
J/A+AS/129/569 : BVRI photometry of OJ 287 (Jia Guibin+ 1998)
J/AJ/132/1256 : eim BATC photometry of OJ 287 (Wu+, 2006)
J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)
J/MNRAS/402/2087 : Optical polarization of OJ 287 in 2005-2009
(Villforth+, 2010)
J/AJ/141/65 : BATC ceimo light curves of OJ 287 (Dai+, 2011)
J/ApJ/764/5 : BR photometry of 2012 precursor flare in OJ287
(Pihajoki+, 2013)
J/A+A/597/A80 : GMVA 86GHz images of OJ 287 (Hodgson+, 2017)
J/ApJ/835/275 : OJ 287 flux + polarization during 2016 outburst
(Rakshit+, 2017)
J/A+A/610/A74 : OJ 287 far-infrared photometry (Kidger+, 2018)
J/A+A/619/A88 : High cadence polarization monitoring of OJ287
(Myserlis+, 2018)
J/AJ/157/95 : Optical variability of OJ 287 in 2016-2017 (Gupta+, 2019)
J/ApJ/862/1 : Rotation reversals in the polarization in OJ 287
(Cohen+, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d JD Time of observation Julian Date
15 A1 --- l_mag Upper limit flag on mag
16- 21 F6.3 mag mag Instrumental Magnitude
23- 27 F5.3 mag e_mag ?=9.999 Uncertainty in Magnitude (brightness
upper limit indicated as 9.99)
30 I1 --- B [1/5] Pass Band identifier (G1)
31- 32 I2 --- O [01/16] Observation identifier (G2)
33 I1 --- Inst [1/6] Magnitude zero point (G3)
36 A1 --- Band [UBVRI] Human readable Passband
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d JD Time of observation Julian Date
15 A1 --- l_mag Upper limt flag on mag
16- 21 F6.3 mag mag Magnitude
23- 27 F5.3 mag e_mag ?=9.999 Magnitude error (brightness
upper limit indicated as 9.999)
30 I1 --- B [6/9] Code For Pass Band or Frequency (G1)
31- 32 I2 --- O [13/99] Origin of Observation (G2)
35 A1 --- Band [JHKE] Human readable Passband
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d JD Time of observation Julian Date
16- 20 F5.3 Jy Flux Flux density
22- 26 F5.3 Jy e_Flux Flux density error
29- 30 I2 --- B [11/20] Code For Frequency (G1)
31- 32 I2 --- O [10/24] Origin of Observation (G2)
35- 38 A4 --- Band Human readable Frequency (1)
--------------------------------------------------------------------------------
Note (1): Human readable Frequency:
for table3.dat:
4.8, 8.0, 14.5, 22, 37, 90, 150, 230, 270, 375GHz
for table4.dat: LWP
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d JD Time of observation Julian Date
16- 21 F6.3 % P Degree of linear polarization
23- 27 F5.3 % e_P Error in linear polarization
30- 36 F7.3 deg PA Position Angle
38- 44 F7.3 deg e_PA Error in Position Angle
47- 48 I2 --- B [1/13] Code For Band (G1)
49- 50 I2 --- O [01/21] Origin of Observation (G2)
53- 56 A4 --- Band Human readable Passband (1)
--------------------------------------------------------------------------------
Note (1): Human readable Passband:
for table5.dat: UBVRI
for table6.dat: 4.8, 8.0 or 14.5GHz
--------------------------------------------------------------------------------
Global notes:
Note (G1): Pass Band identifier as follows:
1 = U
2 = B
3 = V
4 = R
5 = I
6 = J
7 = H
8 = K
9 = Eye estimate
10 = LWP 2500Å
11 = 5 GHz
12 = 8 GHz
13 = 14.5 GHz
14 = 22 GHz
15 = 37 GHz
16 = 90 GHz
17 = 150 GHz
18 = 230 GHz
19 = 270 GHz
20 = 375 GHz
Note (G2): Observation identifier code as follows:
1 = Nordic Optical Telescope
2 = Jacobus Kapteyn Telescope
3 = Heidelberg
4 = Torino Observatory
5 = Tuorla Observatory
6 = Calar Alto
7 = Boltwood
8 = IAC-80
10 = Cananea
11 = Lowell Observatory
12 = Rome
13 = Crimea Observatory
14 = San Pedro Martir
15 = RoboScope
16 = Perugia Observatory
18 = Carlos Sanchez Telescope
19 = UKIRT
20 = IUE
21 = Michigan Radio Telescope
22 = Metsahovi Radio Telescope
23 = SEST
24 = Stevens J. A. et al., 1994ApJ...437...91S 1994ApJ...437...91S
90 = Day
91 = Hewitt
92 = Jensen
93 = Kinnunen
94 = Nelson
95 = Poyner
96 = Toone
97 = Vanmunster
98 = Westlund
99 = Worraker
Note (G3): Instrumental magnitude zero point code as follows:
1 = CCD photmetry: OJ287 magnitude zero point from field stars
2 = CCD photmetry: Magnitude zero point from Star 10
(Smith et al., 1985AJ.....90.1184S 1985AJ.....90.1184S)
3 = CCD photmetry: Magnitude zero point from Star 4
(Smith et al., 1985AJ.....90.1184S 1985AJ.....90.1184S)
4 = CCD photmetry: Magnitude zero point from Star 11
(Smith et al., 1985AJ.....90.1184S 1985AJ.....90.1184S)
5 = CCD photmetry: Magnitude zero point from Star C2
Fiorucci & Tosti 1996, Cat. J/A+AS/116/403
6 = Photopolarimeter
--------------------------------------------------------------------------------
Acknowledgements:
Tapio Pursimo, tpursimo(at)not.iac.es
(End) Patricia Vannier [CDS] 08-May-2021