2014A&A...566A..26M


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.23CET00:54:33

2014A&A...566A..26M - Astronomy and Astrophysics, volume 566A, 26-26 (2014/6-1)

Evidence of internal rotation and a helical magnetic field in the jet of the quasar NRAO 150.

MOLINA S.N., AGUDO I., GOMEZ J.L., KRICHBAUM T.P., MARTI-VIDAL I. and ROY A.L.

Abstract (from CDS):

The source NRAO150 is a very prominent millimeter to radio emitting quasar at redshift z=1.52 for which previous millimeter VLBI observations revealed a fast counterclockwise rotation of the innermost regions of the jet. Here we present new polarimetric multi-epoch VLBI-imaging observations of NRAO150 performed at 8, 15, 22, 43, and 86GHz with the Very Long Baseline Array (VLBA), and the Global Millimeter VLBI Array (GMVA) between 2006 and 2010. All new and previous observational evidence - i.e., spectral index maps, multi-epoch image cross-correlation, and low level of linear polarization degree in optically thin regions - are consistent with an interpretation of the source behavior where the jet is seen at an extremely small angle to the line of sight, and the high frequency emitting regions in NRAO150 rotate at high speeds on the plane of the sky with respect to a reference point that does not need to be related to any particularly prominent jet feature. The observed polarization angle distribution at 22, 43, and 86GHz during observing epochs with high polarization degree suggests that we have detected the toroidal component of the magnetic field threading the innermost jet plasma regions. This is also consistent with the lower degree of polarization detected at progressively poorer angular resolutions, where the integrated polarization intensity produced by the toroidal field is explained by polarization cancellation inside the observing beam. All this evidence is fully consistent with a kinematic scenario where the main kinematic and polarization properties of the 43GHz emitting structure of NRAO150 are explained by the internal rotation of such emission regions around the jet axis when the jet is seen almost face on. A simplified model developed to fit helical trajectories to the observed kinematics of the 43GHz features fully supports this hypothesis. This explains the kinematics of the innermost regions of the jet in NRAO150 in terms of internal jet rotation.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - quasars: general - galaxies: groups: individual: NRAO150 - techniques: polarimetric - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/566/A26): modelfit.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 - 2021
#notes
1 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 399 1
2 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 472 2
3 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2048 1
4 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5389 1
5 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1568 2
6 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2030 1
7 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2545 2

    Equat.    Gal    SGal    Ecl

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2021.01.23-00:54:33

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