Long-term monitoring of Sgr A at 7 mm with VERA and KaVA

We present the results of radio monitoring observations of Sgr A* at 7 mm (i.e. 43 GHz) with VLBI Exploration of Radio Astrometry (VERA), which is a VLBI array in Japan. VERA provides angular resolutions on millisecond scales, resolving structure within ~100 Schwarzschild radii of Sgr A* similar to...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Akiyama, Kazunori, Kino, Motoki, Sohn, Bong Won, Sang Sung Lee, Trippe, Sascha, Honma, Mareki
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.11.2013
Subjects
Arrays
Astrometry
Monitoring
Physics - Astrophysics of Galaxies
Physics - High Energy Astrophysical Phenomena
Online AccessGet full text

Cover

More Information
Summary:We present the results of radio monitoring observations of Sgr A* at 7 mm (i.e. 43 GHz) with VLBI Exploration of Radio Astrometry (VERA), which is a VLBI array in Japan. VERA provides angular resolutions on millisecond scales, resolving structure within ~100 Schwarzschild radii of Sgr A* similar to Very Large Baseline Array (VLBA). We performed multi-epoch observations of Sgr A* in 2005 - 2008, and started monitoring it again with VERA from January 2013 for tracing the current G2 encounter event. Our preliminary results in 2013 show that Sgr A* on mas scales has been in ordinary state as of August 2013, although some fraction of the G2 cloud already passed pericenter of Sgr A* in April 2013. We will continue on monitoring Sgr A* with VERA and newly developed KaVA (KVN and VERA Array).
ISSN:2331-8422
DOI:10.48550/arxiv.1311.5852