High-frequency VLBI observations of Sgr A* during a multi-frequency campaign in May 2007

R-S Lu1,2, T P Krichbaum1, A Eckart2, S König2,1, D Kunneriath2,1, G Witzel2, A Witzel1 and J A Zensus1


(1) 1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
(2) 2 University of Cologne, I. Physikalisches Institut, Zülpicher Str. 77, D-50937 Köln, Germany

Weblink: http://arXiv.org/abs/0809.2463

Abstract:

In May 2007 the compact radio source Sgr A* was observed in a global multi-frequency monitoring campaign, from radio to X-ray bands. Here we present and discuss first and preliminary results from polarization sensitive VLBA observations, which took place during May 14-25, 2007. Here, Sgr A* was observed in dual polarization on 10 consecutive days at 22, 43, and 86 GHz. We describe the VLBI experiments, our data analysis, monitoring program and show preliminary images obtained at the various frequencies. We discuss the data with special regard also to the short term variability.

Preprints available from the authors at rslu@mpifr-bonn.mpg.de , or the raw TeX (no figures) if you click here.

Back to the gcnews home-page.