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Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
Michael Janssen, Heino Falcke, Matthias Kadler +236
Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimeter wavelengths have the power to reveal the launching and initial collimation region of e…
Polarimetric properties of Event Horizon Telescope targets from ALMA
Ciriaco Goddi, Ivan Marti-Vidal, Hugo Messias +31
We present the results from a full polarization study carried out with ALMA during the first VLBI campaign, which was conducted in Apr 2017 in the 3mm and 1.3mm bands, in con…
Interstellar Scintillation Monitoring of the RadioAstron Blazars
Jun Liu, Thomas P. Krichbaum, Hayley Bignall +6
The RadioAstron space radio telescope provides a unique opportunity to study the extreme brightness temperatures () in AGNs with unprecedented long baselines of up t…
Ruling out GeV thermal relic annihilating dark matter by radio observation of the Andromeda galaxy
Man Ho Chan, Lang Cui, Jun Liu +1
In the past few years, some studies claimed that annihilating dark matter with mass GeV can explain the GeV gamma-ray excess in our Galaxy. However, recent analyses o…
Rapid variability of BL Lac 0925+504: interstellar scintillation induced?
Jun Liu, Xiang Liu
Analysis of rapid variability at 4.85 GHz for the BL BLac object 0925+504 is presented and discussed. The structure functions (SF) are investigated with both refractive and weak in…
Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability
Jun Liu, Hayley Bignall, Thomas P. Krichbaum +6
We present the first results of an ongoing intra-day variability (IDV) flux density monitoring program of 107 blazars, which were selected from a sample of RadioAstron space very l…
Intra-day variability observations and the VLBI structure analysis of quasar S4 0917+624
X. Liu, L. -G. Mi, J. Liu +7
The IDV observations of S4 0917+624 were carried out monthly, from August 2005 to January 2010, with the Urumqi 25m radio telescope at 4.8 GHz. The quasar S4 0917+624 exhibits only…