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Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bands
L. Fuhrmann, T. P. Krichbaum, A. Witzel +22
The BL Lac object S5 0716+71 was observed in a global multi-frequency campaign to search for rapid and correlated flux density variability and signatures of an inverse-Compton (IC)…
Modeling nuclei of radio galaxies from VLBI radio observations. Application to the BL Lac Object S5 1803+784
J. Roland, S. Britzen, N. A. Kudryavtseva +2
We present a new method to fit the variations of both coordinates of a VLBI component as a function of time, assuming that the nucleus of the radio source contains a binary black h…
The soft X-ray properties of AGN from the CJF sample; A correlation analysis between soft X-ray and VLBI properties
S. Britzen, W. Brinkmann, R. M. Campbell +4
Context: We present the soft X-ray properties obtained in the ROSAT All-Sky survey and from pointed PSPC observations for the AGN in the complete flux-density limited Caltech-Jodre…
A Multi-Epoch VLBI Survey of the Kinematics of CJF Sources; Part I: Model-Fit Parameters and Maps
S. Britzen, R. C. Vermeulen, G. B. Taylor +7
Context: This is the first of a series of papers presenting VLBI observations of the 293 Caltech-Jodrell Bank Flat-Spectrum (hereafter CJF) sources and their analysis. Aims: One of…
A Multi-epoch VLBI Survey of the Kinematics of Caltech-Jodrell Bank Flat-Spectrum Sources, Part II: Analysis of the Kinematics
S. Britzen, R. C. Vermeulen, R. M. Campbell +7
Context: This is the second of a series of papers presenting VLBI observations of the 293 Caltech-Jodrell Bank Flat-Spectrum (hereafter CJF) sources and their analysis. Aims: To ob…
A Possible Periodicity in the Radio Lightcurves of 3C454.3
S. J. Qian, N. A. Kudryavtseva, S. Britzen +6
During the period 1966.5 - 2006.2 the 15GHz and 8GHz lightcurves of 3C454.3 (z=0.859) show a qsasi-periodicity of ~12.8 yr (~6.9 yr in the rest frame of the source) with a double-b…
J1128+592: a highly variable IDV source
K. E. Gabanyi, N. Marchili, T. P. Krichbaum +9
Short time-scale radio variations of compact extragalactic radio quasars and blazars known as IntraDay Variability (IDV) can be explained in at least some sources as a propagation…
The IDV source J1128+5925, a new candidate for annual modulation?
K. E. Gabanyi, N. Marchili, T. P. Krichbaum +9
Short time-scale radio variations of compact extragalactic radio sources, known as IntraDay Variability, can be explained in at least some sources by a source-extrinsic effect, in…
Rapid and correlated variability of blazar S5 0716+71 from radio- to sub-mm bands
L. Fuhrmann, T. P. Krichbaum, A. Witzel +9
The BL Lac object S5 0716+71 was target of a coordinated and global multi-frequency campaign to search for rapid and correlated variability and signatures of the inverse-Compton ca…
"Oscillating" components in the BL Lac object 0716+714?
S. Britzen, V. Meyer, A. Witzel +5
15 VLBA observations of the BL Lac object 0716+714, performed between 1994.67 and 2006.40 at 15 GHz, have been analyzed. Part of the data (12 epochs) were obtained within the Mojav…
The Kinematics of S5 1803+784
N. A. Kudryavtseva, S. Britzen, A. Witzel +8
We present the results of a multi-frequency analysis of the structural variability in the parsec-scale jet of the blazar S5 1803+784. More than 90 epochs of observations at 6 frequ…
Highest-Resolution Radio Astronomy: The Quest for the Black Hole
J. A. Zensus, T. P. Krichbaum, S. Britzen
Radio observations with Very Long Baseline Interferometry (VLBI) provide the highest resolution in astronomy. Combining earth-bound with space-based telescopes and advancing the ob…
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71: II. A search for intra-day variability at millimetre wavelengths with the IRAM 30 m telescope
I. Agudo, T. P. Krichbaum, H. Ungerechts +12
We report on a densely time sampled polarimetric flux density monitoring of the BL Lac object S5 0716+71 at 86 GHz and 229 GHz with the IRAM 30 m telescope within a coordinated bro…
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. I. Simultaneous broadband observations during November 2003
L. Ostorero, S. J. Wagner, J. Gracia +6
Some intra-day variable, compact extra-galactic radio sources show brightness temperatures severely exceeding 10^{12} K, the limit set by catastrophic inverse-Compton (IC) cooling…
A new approach for constraining the Hubble constant from proper motions of radio jets
Bartosz Lew, Boudewijn F. Roukema, Silke Britzen +1
Withdrawn due to a mistake in jets' Doppler factor modeling. An updated version will appear after revisiting this work.
Relativistic jet motion in the core of the radio-loud quasar J1101+7225
J. -U. Pott, A. Eckart, M. Krips +4
Multi-epoch GHz Very Long Baseline Interferometry (VLBI) data of the radio-loud quasar J1101+7225 were analyzed to estimate the proper motion of extended optically thin jet compone…
Kinematic Study of the Blazar S5 0716+714
U. Bach, T. P. Krichbaum, E. Ros +5
We present the results of a multi-frequency study of the structural evolution of the VLBI jet in the BL Lac object 0716+714 over the last 10 years. We show VLBI images obtained at…
Kinematic Study of the Blazar 0716+714
U. Bach, T. P. Krichbaum, S. Britzen +3
We determined the kinematics at the jet of 0716+714 from a reanalysis of multi-frequency VLBI data (5, 8.4, 15, 22 GHz) obtained during the last 10 years combined with data from th…
Motion Statistics in the CJ Survey -- The Status in October 2002
R. C. Vermeulen, S. Britzen, G. B. Taylor +4
In the Caltech-Jodrell Survey of bright flat-spectrum radio sources, 3-5 epochs have now been observed for nearly all 293 sources; a uniquely large sample. The derivation of compon…
Is 0716+714 a superluminal blazar?
U. Bach, T. P. Krichbaum, E. Ros +3
We present an analysis of new and old high frequency VLBI data collected during the last 10 years at 5--22 GHz. For the jet components in the mas-VLBI jet, two component identifica…
Radio observations of the -ray blazar 0528+134
M. Pohl, W. Reich, T. P. Krichbaum +10
We report multifrequency observations of the -ray blazar 0528+134 with the Effelsberg 100-m telescope, the IRAM 30-m telescope, and the NRL Green Bank Interferometer. 0528+134 u…
Radio observations of the gamma-ray quasar 0528+134: Superluminal motion and an extreme scattering event
M. Pohl, W. Reich, T. P. Krichbaum +9
We report on multifrequency radio observations made with the Effelsberg 100-m telescope, the IRAM 30-m telescope and the Green Bank Interferometer between 1992 and 1994 of the -…