High cadence polarization monitoring of OJ287

DOI

We present a multifrequency, dense radio monitoring program of the blazar OJ287 using the 100-m Effelsberg radio telescope. The program aims to test different binary supermassive black hole (SMBH) scenarios and studying the physical conditions in the central region of this bright blazar. Between December 2015 and January 2017 (MJD 57370-57785), the radio electric vector position angle (EVPA) showed a large clockwise (CW) rotation by about 340{deg} with a mean rate of -1.04{deg}/day. Based on concurrent polarized Very Long Baseline Array (VLBA) data, the rotation seems to originate within the jet core at 43GHz. Optical polarization data show a similar monotonic CW EVPA rotation of about -1.1{deg}/day, superposed by shorter and faster rotations of about 7.8{deg}/day, mainly in the CW sense. When combined, the single dish, VLBI and optical polarization data are consistent with a polarized emission component propagating on a helical trajectory within a bent jet. We constrained the helix arc length (0.26pc) and radius (about 0.04pc) and the projected jet bending arc length (about 1.9-7.6pc). The helical trajectory covers only a part of the jet width, possibly its spine. In addition, we found a stable polarized component with EVPA (-10{deg}) perpendicular to the large scale jet, suggesting dominance of the poloidal magnetic field component.

Cone search capability for table J/A+A/619/A88/fig6pa (Integrated polarization angle - VLBA)

Cone search capability for table J/A+A/619/A88/list (List of fits files)

Cone search capability for table J/A+A/619/A88/fig1i (Stokes I - Effelsberg)

Cone search capability for table J/A+A/619/A88/fig1ml (Linear polarization degree - Effelsberg)

Cone search capability for table J/A+A/619/A88/fig1pa (Polarization angle - Effelsberg)

Cone search capability for table J/A+A/619/A88/fig1mc (Circular polarization degree - Effelsberg)

Cone search capability for table J/A+A/619/A88/fig6i (Integrated Stokes I - VLBA)

Cone search capability for table J/A+A/619/A88/fig6ml (Integrated linear polarization degree - VLBA)

Identifier
DOI http://doi.org/10.26093/cds/vizier.36190088
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/619/A88
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/619/A88
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/619/A88
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/A+A/619/A88
Provenance
Creator Myserlis I.; Komossa S.; Angelakis E.; Gomez J.L.; Karamanavis V.,Krichbaum T.P.; Bach U.; Grupe D.
Publisher CDS
Publication Year 2018
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Cosmology; Exoplanet Astronomy; Galactic and extragalactic Astronomy; High Energy Astrophysics; Interstellar medium; Natural Sciences; Observational Astronomy; Physics