4 July 2017
MPIfR
Europe/Berlin timezone
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Session II

Place

Location: MPIfR
Address: Auf dem Hügel 69 D-53121 Bonn
Room: 0.02
Date: 4 Jul 13:30 - 15:10

Timetable | Contribution List

Displaying 8 contributions out of 8
Session: Session II
Fast radio bursts (FRBs) are a new radio transient phenomena that puzzles scientists over their nature. These millisecond, Janksky bright single pulses are seen with dispersion measures (DMs) several times larger then those caused by the electron density in our own Milky Way and therefore thought to be of extra-galactic origin. Their non-repetitive behaviour (only one FRB has seen to repeat thus f ... More
Presented by Leonard HOUBEN on 4/7/2017 at 11:30
Session: Session II
I will present new results on spectral index imaging of several AGN using multi-frequency space VLBI observations with RadioAstron, in combination with ground array images. I will introduce a GUI-based Python tool for spectral analysis of VLBI data, that was used to produce the results.
Presented by Ms. Laura VEGA GARCÍA on 4/7/2017 at 12:42
Session: Session II
As a participant in the Black Hole Cam project, JIVE undertook to develop a fringe-fitting tool in the Casa dataprocessing package closely modeled on the AIPS FRING task. A Python prototype has been completed and is now in preliminary use by colleagues at Radboud University Nijmegen; the C++ code to apply the calibrations is now mature, and a first draft of a C++ implementation is now complete alt ... More
Presented by Dr. Des SMALL on 4/7/2017 at 12:18
Session: Session II
SKA phase 2 sensitivity could be achieved at relatively low cost if we can piggyback a radio astronomy receiver on solar concentrators, of which four square kilometres are operating in the form of solar power towers. However the mirror arrays form a speckle pattern rather than a point focus, but we can restore full sensitivity in principle using a focal-plane array to collect the power from ... More
Presented by Dr. Alan ROY on 4/7/2017 at 11:54
Session: Session II
The Event Horizon Telescope (EHT) project aims to image the supermassive black holes in the center of our Galaxy (Sgr A*) and M87 at event horizon scales using very long baseline interferometry (VLBI) at (sub-)millimetre wavelengths. The EHT currently consists of a number of telescopes around the globe. A telescope in Africa will greatly improve the uv-coverage and the image quality. We prop ... More
Presented by Dr. Cornelia MUELLER on 4/7/2017 at 12:30
Session: Session II
The powerful radio galaxy Cygnus A is one of the very few targets where the jet acceleration and collimation region can be probed directly through VLBI imaging. Through a rich, multi-wavelength VLBI data set, we were able to reconstruct the two-sided collimation profile of the outflow, and to follow its evolution from scales of a few hundreds to millions Schwarzschild radii. Preliminary results su ... More
Presented by Dr. Biagina BOCCARDI on 4/7/2017 at 12:06
Session: Session II
Blazars, a subclass of AGN jets, show extreme flux variability across the electromagnetic spectrum from radio to gamma-rays. A challenge to theoretical interpretation is the rapid flux variability at GeV energies, which implies an origin from ultra-compact emission regions (< sub-pc). The exact location of the gamma-ray emitting region within the AGN is also controversially discussed. The pri ... More
Presented by Ms. Efthalia TRAIANOU on 4/7/2017 at 12:54
Session: Session II
We have established the Euro VLBI team to follow-up candidate electromagnetic counterparts to gravitational wave events with the EVN and e-MERLIN. The LIGO-VIRGO consortium and partners inform each other through private circulars. The role of VLBI is on the one hand to help filter out some candidates like Galactic transients or variable AGN that are not true counterparts, and on the other hand mea ... More
Presented by Dr. Zsolt PARAGI on 4/7/2017 at 11:42
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