quasi-periodicity in the parsec-scale jet of the quasar 3c345 - a high resolution study using vsop...
DESCRIPTION
The Quasar 3C345 - Overview - z=0.595, m=16 arcsec scales compact region at the base of a 4''jet; diffuse steep-spectrum halo mas scales VLBI monitoring since 1979 long time study core-jet structure core (D): unresolved, optically thick, flat spectrum, stationary (Bartel et al. 1986) jet: 11 components (C1-C11), different curved trajectories, variable superluminal speed (2-20c) DC9C8C7 C5 C4 C3TRANSCRIPT
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Quasi-Periodicity in the Parsec-Scale Quasi-Periodicity in the Parsec-Scale JetJet
of the Quasar 3C345of the Quasar 3C345- A High Resolution Study using VSOP and VLBA -- A High Resolution Study using VSOP and VLBA -
In collaboration with:
J.A. ZensusA. Witzel
T.P. KrichbaumA.P. Lobanov
E. Ros
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Content of the TalkContent of the Talk
The Quasar 3C345OverviewObservationsKinematic study of the jetFlux density study of the jetMerging of GalaxiesThe model
Outlook
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The Quasar 3C345The Quasar 3C345- Overview -- Overview -
z=0.595, m=16 arcsec scalescompact region at the base of a 4''jet; diffuse steep-spectrum
halo mas scales
VLBI monitoring since 1979 Þ long time study core-jet structure
core (D): unresolved, optically thick, flat spectrum, stationary (Bartel et al. 1986)jet: 11 components (C1-C11), different curved trajectories, variable superluminal speed (2-20c)
D C9 C8 C7
C5 C4 C3
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4 Epochs: 1.6GHz VSOP
4 Epochs: 5GHz VSOP
7 Epochs: 22GHz VLBA
9+5 Epochs: 43GHz VLBA
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Jet Kinematics: Core -ShiftJet Kinematics: Core -Shift
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Jet Kinematics: Trajectory of Jet Kinematics: Trajectory of C7C7
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Jet Kinematics: Trajectories of C8, Jet Kinematics: Trajectories of C8, C9C9
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Jet Kinematics: Trajectories of C10, Jet Kinematics: Trajectories of C10, C11C11
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Jet KinematicsKinematics: Trajectories
9 years later
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Jet Kinematics: Ejection Position Jet Kinematics: Ejection Position AngleAngle
T = 8-10 years
P.A.ej = 2.6° ± 0.3° /year
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Jet Parameters: Min. Lorentz FactorJet Parameters: Min. Lorentz Factor
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Jet Parameters: Constant Lorentz Jet Parameters: Constant Lorentz FactorFactor
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Jet Parameters: Increasing Jet Parameters: Increasing gg
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Flux Density Evolution: Flux Density Evolution: C7/C8/C10/C11C7/C8/C10/C11
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Trajectory part of Flux Density Trajectory part of Flux Density PeaksPeaks
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Evolution of the Flux Density Evolution of the Flux Density PeaksPeaks
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Merging of Galaxies Merging of Galaxies Þ Þ Binary Black Binary Black Holes? Holes?
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Binary Black Hole ModelBinary Black Hole Model
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Binary Black Hole ModelBinary Black Hole ModelBinary Black Hole model of Lobanov & Roland
2002:C7: Kinematic and flux density evolution
C5-to-C8: Obs: D P.A.ej = 28° ± 14° BBH: D P.A.ej = 27°
peak-to-peak: Obs: D P.A.ej = 26° ± 7° BBH: D P.A.ej = 30°
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Results1 Three new ejected jet components C9, C10 and C11. 2 Different component trajectories but similarity of
the C5 and C8 trajectory: Equivalent points areabout 8-10 years later for C8 than for C5.
3 Component ejection angles vary: Quasi-periodicity of 8-10 years. Long-term variation of P.A.ej = 2.6° ± 0.3° / year
4 Acceleration of the jet components. Lorentz factor rises from 3 to 16.
5 Doppler factor rises from 5 to 30. 6 Angle to the line of sight changes down to: 3.5° > Q > 0.2°.7 Component flux density peaks due to Doppler boosting.8 Component flux density peaks show quasi-periodicity
with a period of about 9 years.9 Observations match with Binary Black Hole model
of Lobanov & Roland 2002: Orbital period in observers frame: 8.5 years. Precession period in observers frame: 125 years (2.9° / year)
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Outlook1. Continue VLBI monitoring to pursue our intensive study of this
particular quasar.
3. Test the stationarity of the core:Phase-referencing program started with the VLBA to the nearby
quasar NRAO 512 (~ 0.5° apart) at 7 mm and 3 mm in 2002. 4. Test Binary Black Hole model with jet components C8 and C9.
2. Several observations have been made at l = 3 mm to supplement our extensive study at core distances smaller than 100 marcsec.
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Flare Model, Lobanov & Flare Model, Lobanov & ZensusZensus
Lobanov & Zensus 1999
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Spectral Index MapsSpectral Index Maps
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ComponentsComponents
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Core -ShiftCore -Shift
5/22Ghz: 0.182mas 5/43GHz: 0.254mas
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Flux Density Evolution of C9Flux Density Evolution of C9
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1.6
Precision of the TrajectoriesPrecision of the Trajectories
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1.6
Precision of the TrajectoriesPrecision of the Trajectories
Dx @ 0.3 mas r @ 14 pc r @ 3 pc
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1.6
Precision of the TrajectoriesPrecision of the Trajectories
Dx @ 0.4 mas
r @ 49 pc
r @ 3 pc
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1.6
Precision of the TrajectoriesPrecision of the Trajectories
Small changes in the observed trajectories lead to
big differences in derived jet parameters! ÞNeed high-precision trajectories
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The inner jet (C10-C7) of The inner jet (C10-C7) of 3C3453C345