J/ApJ/949/20 Multiepoch ∼2-43GHz VLBI monitoring obs. of OJ 287 (Yuan+, 2023)
Correlation analysis between OJ 287 radio jet observables.
Yuan Q., Zhang M., Liu X., Jiang P.F., Kokhirova G.I.
<Astrophys. J., 949, 20 (2023)>
=2023ApJ...949...20Y 2023ApJ...949...20Y
ADC_Keywords: BL Lac objects; Interferometry; Radio sources
Keywords: Active galactic nuclei ; Blazars ; Radio jets ;
Relativistic aberration ; Relativistic jets ;
Very long baseline interferometry
Abstract:
We collected the archival data of blazar OJ 287 from heterogeneous
very long baseline interferometry monitoring programs at 2.3, 8.6, 15,
and 43GHz. The data reduction and observable extraction of those
multiband, multiepoch observations are batch-processed consistently
with our automated pipeline. We present the multivariate correlation
analysis on the observables at each band. We employ the
cross-correlation function to search the correlations and the Monte
Carlo technique to verify the certainty of correlations. Several
correlations are found. The foremost findings are the correlations
between the core flux density and the jet position angles on different
scales, which validated the plausible predictions of the jet with
precession characteristics. Meanwhile, there is a variation in the
offset between the core electric vector position angle and the
inner-jet position angle over time at 15 and 43 GHz.
Description:
A collection of archived multiband multiepoch VLBI data from several
geodetic/astrometric and astrophysical VLBI programs of the
low-synchrotron-peaked (LSP) BL Lac object, OJ 287, are analyzed in
this study. It includes the S/X-band (2.3GHz/8.6GHz) data from the
Research and Development VLBA (RDV) program, the Ku-band (15GHz) data
from the MOJAVE program, and the Q-band (43GHz) data from the
VLBA-BU-BLAZAR program.
We use the RDV data observed from 1994 July to 2003 December until the
source was dropped from the astrometric monitoring owing to the
structural complexity.
For this source, the database maintained by the MOJAVE team comprises
127 observed epochs over a span of 25yr from 1995 April to 2020 June.
The MOJAVE database consists of two parts: the 2cm Survey, and the
MOJAVE program initiated in 2002 as the successor to the former.
MOJAVE program observations were carried out in dual polarization mode
using frequencies centered at 15.4GHz, with a bandwidth of 32MHz. We
use the self-calibrated visibility data from the streamed release of
the MOJAVE database in our analyzing pipeline.
In addition, we also use the 43GHz data from the VLBA-BU-BLAZAR
program (Jorstad+ 2017, J/ApJ/846/98), which includes data from
2007 June onward.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
08 54 48.87 +20 06 30.6 OJ 287 = QSO B0851+202
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 63 323 Core component properties
table2.dat 36 609 Jet components properties
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See also:
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
J/A+AS/139/545 : 1-22 GHz spectra survey (Kovalev+, 1999)
J/A+AS/143/357 : Tuorla Quasar Monitoring (Katajainen+ 2000)
J/A+AS/146/141 : Intensive monitoring of OJ 287 (Pursimo+, 2000)
J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)
J/ApJ/613/682 : AGN central masses (Peterson+, 2004)
J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)
J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005)
J/AJ/131/1262 : Circular pol. images at 15GHz of AGN jets (Homan+, 2006)
J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)
J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)
J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)
J/AJ/138/1874 : MOJAVE. VI. Kinematics of blazar jets (Lister+, 2009)
J/ApJ/706/1253 : MOJAVE VII. Blazar jet acceleration (Homan+, 2009)
J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010)
J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)
J/AJ/141/65 : BATC ceimo light curves of OJ 287 (Dai+, 2011)
J/ApJ/747/63 : 7mm VLBA observations of BL Lac object OJ287 (Agudo+, 2012)
J/ApJ/758/84 : Relativistic jets in RRFID database. II. 10yr (Piner+, 2012)
J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)
J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012)
J/MNRAS/421/1861 : OJ287 polarization and VLBI jet direction (Valtonen+, 2012)
J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013)
J/A+A/562/A79 : Variability of 7 blazars in six bands (Sandrinelli+, 2014)
J/ApJ/784/159 : Revisited jet bending in γ-ray AGNs (Graham+, 2014)
J/ApJ/798/134 : MOJAVE. XII. Acceleration of blazar jets (Homan+, 2015)
J/ApJ/810/L9 : 1.5Jy MOJAVE AGN sample and 3FGL data (Lister+, 2015)
J/AJ/151/142 : Five years of blazar obs. with VERITAS (Archambault+, 2016)
J/AJ/152/12 : MOJAVE. XIII. New 15GHz obs. on 1994-2013 (Lister+, 2016)
J/A+A/590/A10 : 3C 279 optical photometry and polarimetry (Kiehlmann+, 2016)
J/A+A/597/A80 : GMVA 86GHz images of OJ 287 (Hodgson+, 2017)
J/ApJ/846/98 : Jet kinematics of blazars with VLBA (Jorstad+, 2017)
J/MNRAS/468/4992 : MOJAVE XIV. AGN jet shapes & angles (Pushkarev+, 2017)
J/ApJ/862/1 : Rot. reversals in the polarization in OJ 287 (Cohen+, 2018)
J/ApJ/862/151 : MOJAVE. XVI: pc-scale AGN jet cores at 15GHz (Hodge+, 2018)
J/A+A/609/A68 : Full-Stokes polarimetry of 5 radio sources (Myserlis+, 2018)
J/A+A/619/A88 : High cadence polarization obs. of OJ287 (Myserlis+, 2018)
J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 2018)
J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs. of AGN jets (Lister+, 2018)
J/ApJ/874/43 : MOJAVE. XVII. Pc-scale jet kinematics (Lister+, 2019)
J/AJ/157/95 : Optical variability of OJ 287 in 2016-2017 (Gupta+, 2019)
J/MNRAS/495/3576 : AGN jet shape transition geometry (Kovalev+, 2020)
J/ApJ/902/104 : Korean VLBI Network monitoring of OJ 287 (Lee+, 2020)
J/ApJ/923/30 : MOJAVE. XVIII. Bright radio-loud active AGNs (Lister+, 2021)
J/ApJ/944/177 : MOMO. VI. Radio variability of OJ 287 (Komossa+, 2023)
J/MNRAS/520/6053 : MOJAVE. Persistent pol. in AGN jets (Pushkarev+ 2023)
J/ApJS/265/8 : X & radio components in extragalactic jets (Reddy+, 2023)
J/A+A/694/A206 : OJ 287 polarisation in radio, mm & opt. (Jormanainen+, 2025)
http://www.cv.nrao.edu/MOJAVE/ : MOJAVE homepage
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 yr Epoch [1994.5/2020.9] Date of observation, Bessellian
year
10- 13 F4.1 GHz Freq [2.3/43] Observing frequency
15- 17 A3 --- --- [GHz]
19- 23 F5.3 Jy Icore [0.5/9.3] Flux density of the fitted Gaussian
core component
25- 29 F5.3 Jy e_Icore [0.028/0.5] Uncertainty in Icore
31- 34 F4.2 mas Maj [0.2/3.63]? Major axis, fitted Gaussian core
component
36- 39 F4.2 mas Min [0.18/3.2]? Minor axis, fitted Gaussian core
component
41- 46 F6.1 deg PA [-171.2/90.3]? Position Angle, fitted Gaussian
core component
48- 50 F3.1 deg e_PA [0/1]? Uncertainty in PA
52- 56 F5.1 deg EVPA [-84.4/85.4]? EVPA of the fitted Gaussian core
component
58- 63 F6.3 deg e_EVPA [3/19]? Uncertainty in EVPA
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 yr Epoch [1994.5/2020.9] Date of Observation, Bessellian
year
10- 13 F4.1 GHz Freq [2.3/43] Observing Frequency
15- 17 A3 --- --- [GHz]
19 I1 --- ID [1/9] Fitted jet component number
21- 25 F5.2 mas dRA [-7.2/0.61] Jet offset from core in Right
Ascension
27- 31 F5.2 mas dDE [-4.6/1] Jet offset from core in Declination
33- 36 I4 deg JPA [-150/-14] Jet position angle, fitting
regression line
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-May-2025