The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004

Abstract

We present Very Long Baseline Array (VLBA) observations of the TeV blazars H 1426+428, 1ES 1959+650, and PKS 2155-304 obtained during the years 2001 through 2004. We observed H 1426+428 at four epochs at 8 GHz, and found that its parsec-scale structure consisted of a ~17 mJy core and a single ~3 mJy jet component with an apparent speed of 2.09 +/- 0.53c. The blazar 1ES 1959+650 was observed at three epochs at frequencies of 15 and 22 GHz. Spectral index information from these dual-frequency observations was used to definitively identify the core of the parsec-scale structure. PKS 2155-304 was observed at a single epoch at 15 GHz with dual-circular polarization, and we present the first VLBI polarimetry image of this source. For 1ES 1959+650 and PKS 2155-304, the current observations are combined with the VLBA observations from our earlier paper to yield improved apparent speed measurements for these sources with greatly reduced measurement errors. The new apparent speed measured for component C2 in 1ES 1959+650 is 0.00 +/- 0.04c (stationary), and the new apparent speed measured for component C1 in PKS 2155-304 is 0.93 +/- 0.31c. We combine the new apparent speed measurements from this paper with the apparent speeds measured in TeV blazar jets from our earlier papers to form a current set of apparent speed measurements in TeV HBLs. The mean peak apparent pattern speed in the jets of the TeV HBLs is about 1c. We conclude the paper with a detailed discussion of the interpretation of the collected VLBA data on TeV blazars in the context of current theoretical models for the parsec-scale structure of TeV blazar jets.

arXiv comment16 pages, Astrophysical Journal, in press

References in corpus (52)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• An Exceptional VHE Gamma-Ray Flare of PKS 2155-304
• Structured jets in TeV BL Lac objects and radiogalaxies
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei III. Kinematics of Parsec-Scale Radio Jets
• Multi-Epoch VLBA Observations of EGRET-Detected Quasars and BL Lac Objects: Superluminal Motion of Gamma-Ray Bright Blazars
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• Multiwavelength Observations of Strong Flares From the TeV-Blazar 1ES 1959+650
• Internal shocks in the jets of radio-loud quasars
• Extreme synchrotron BL Lac objects
• Parsec Scale Properties of Markarian 501
• Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability
• Decelerating Flows in TeV Blazars: A Resolution to the BL Lac -- FR I Unification Problem
• The Inner Jet of the Radio Galaxy M87
• Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets
• H.E.S.S. Observations of PKS 2155-304
• A View through Faraday's Fog 2: Parsec Scale Rotation Measures in 40 AGN
• The Parsec-Scale Structure and Jet Motions of the TeV Blazars 1ES 1959+650, PKS 2155-304, and 1ES 2344+514
• Low power BL Lacertae objects and the blazar sequence: Clues on the particle acceleration process
• Multi-wavelength observations of PKS 2155-304 with H.E.S.S
• Detection of the BL Lac Object H1426+428 at TeV Gamma Ray Energies
• A View through Faraday's fog: Parsec scale rotation measures in AGN
• A Sample of Low Redshift BL Lacs. I. The Radio Data
• Observations of H1426+428 with HEGRA -- Observations in 2002 and reanalysis of 1999&2000 data
• Observation of VHE gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 using the MAGIC telecope
• A sample of low-redshift BL Lacertae objects. II. EVN and MERLIN data and multi-wavelength analysis
• Relativistic Jets in The Radio Reference Frame Image Database I: Apparent Speeds from the First Five Years of Data
• The bulk Lorentz factor crisis of TeV blazars : evidence for an inhomogeneous pileup energy distribution ?
• A hadronic synchrotron mirror model for the "orphan" TeV flare in 1ES 1959+650
• Synoptic studies of seventeen blazars detected in very high-energy gamma-rays
• The Radio Structure of High-Energy Peaked BL Lacertae Objects
• The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
• The Sub-Luminal Parsec-scale Jet of Mkn 501
• The TeV spectrum of H1426+428
• Spectrum of Very High Energy Gamma-Rays from the blazar 1ES1959+650 during Flaring Activity in 2002
• VLBA Polarization Observations of Markarian 421 After a Gamma-Ray High State
• VSOP and Ground-based VLBI Imaging of the TeV Blazar Markarian 421 at Multiple Epochs
• Detection of the BL Lac object 1ES1426+428 in the Very High Energy gamma-ray band by the CAT Telescope from 1998-2000
• X-Ray Spectral Variability of Extreme BL Lac AGN H1426+428
• Do the mildly superluminal VLBI knots exclude ultrarelativistic blazar jets?
• Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002
• Bulk Motion of Ultrarelativistic Conical Blazar Jets
• The SED of the TeV BLLac 1ES 1426+428 after correction for the TeV--IR absorption
• A Structured Leptonic Jet Model of the "Orphan" TeV Gamma-Ray Flares in TeV Blazars
• CANGAROO-III Observations of the 2006 Outburst of PKS2155-304
• Is the Radio Core of BL Lac Precessing?
• Influence of the jet opening angle on the derived kinematical parameters of blazar jets having uniform and stratified bulk motion
• X-ray and TeV Gamma-Ray Emission from Parallel Electron-Positron or Electron-Proton Beams in BL Lac Objects
• Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron-Self-Compton Model
• The Continuing Saga of the Explosive Event(s) in the M87 Jet: Is M87 a Blazar?
• AGN Observations in the GeV/TeV Energy Range with the MAGIC Telescope
• The jet of Markarian 501 from the sub-parsec to the kpc scale

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• MOJAVE XIII. Parsec-Scale AGN Jet Kinematics Analysis Based on 19 years of VLBA Observations at 15 GHz
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• Long-term optical polarization variability of the tev blazar 1es~1959+650
• Non-variable TeV emission from the extended jet of a blazar in the stochastic acceleration scenario: the case of the hard TeV emission of 1ES 1101-232
• Non-radial motion in the TeV blazar S5 0716+714 The pc-scale kinematics of a BL Lac Object
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• Spectral energy distributions of the BL Lac PKS 2155-304 from XMM-Newton
• Flux and spectral variability of the blazar PKS 2155-304 with XMM-Newton: Evidence of Particle Acceleration and Synchrotron Cooling
• The Hard X-ray emission of the blazar PKS 2155--304
• Measuring parameters of AGN central engines with very high energy gamma-ray flares
• Particle Acceleration and Magnetic Field Structure in PKS 2155-304: Optical Polarimetric Observations
• X-ray Intraday Variability of HBL Blazars with XMM-Newton
• TeV blazar variability: the firehose instability?
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• Exploring the connection between radio and GeV-TeV gamma-ray emission in the 1FHL and 2FHL AGN samples
• On radiative acceleration in spine-sheath structured blazar jets
• Gamma-rays in flat-spectrum AGN: Revisiting the fast jet hypothesis with the CJF sample
• Exploring the bulk of the BL Lac object population:1. parsec-scale radio structures
• X-ray Polarization of the High-Synchrotron-Peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-ray Flux States
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• Mechanism of very high energy radiation in BL Lacertae object 3C 66A
• The optical polarization of the blazar PKS 2155$-$304 during an optical flare in 2010
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry. III. First-epoch S band images
• The Kinematics and Ionization of Nuclear Gas Clouds in Centaurus A
• Implications of Bulk Velocity Structures in AGN Jets
• Parsec-scale Structure and Kinematics of Faint TeV HBLs