217 citations · 1.7k across the 72 of their papers we have counts for
73 papers
AGN jets under the microscope: A divide?
Marios Karouzos, Silke Britzen, Arno Witzel +2
A new paradigm for active galactic jet kinematics has emerged through detailed investigations of BL Lac objects using very long baseline radio interferometry. In this new scheme, m…
A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65
N. Marchili, T. P. Krichbaum, X. Liu +5
The BLLac object S4 0954+65 is one of the main targets of the Urumqi monitoring program targeting IntraDay Variable (IDV) sources. Between August 2005 and December 2009, the source…
Deconstructing blazars: A different scheme for jet kinematics in flat-spectrum AGN
Marios Karouzos, Silke Britzen, Arno Witzel +2
Recent VLBI studies of the morphology and kinematics of individual BL Lac objects (S5 1803+784, PKS 0735+178, etc.) have revealed a new paradigm for the pc-scale jet kinematics of…
On the influence of the Sun on the rapid variability of compact extragalactic sources
N. Marchili, T. P. Krichbaum, X. Liu +4
Starting from December 2004, a program for the monitoring of intraday variable sources at a frequency of 5 GHz was performed at the Urumqi Observatory. The analysis of the variabil…
Multiwavelength VLBI observations of Sagittarius A*
R. -S. Lu, T. P. Krichbaum, A. Eckart +5
The compact radio source Sgr\,A*, associated with the super massive black hole at the center of the Galaxy, has been studied with VLBA observations at 3 frequencies (22, 43, 86\,GH…
Gamma-rays in flat-spectrum AGN: Revisiting the fast jet hypothesis with the CJF sample
Marios Karouzos, Silke Britzen, Arno Witzel +2
The recent release of the First Fermi-LAT Source Catalog solidified the predominant association of extragalactic gamma-ray emitters to active galaxies, in particular blazars. A tig…