43 GHz SiO Masers for Phase Calibration with VERA in the Galactic Center

Details 43 GHz SiO Masers for Phase Calibration with VERA in the Galactic Center 43 GHz SiO Masers for Phase Calibration with VERA in the Galactic Center

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917207e&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.07; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present 9 epochs of Very Large Array (VLA) observations of 24 relatively strong 43 GHz SiO (J=1-->0, v=1 and v=2) maser emission in a sample of late-type stars located between 0.3 deg and 2.2 deg from the Galactic Center. The aim was to find suitable Galactic Center phase calibrators for the Japanese “VLBI Exploration of Radio Astrometry” (VERA) network, which will perform sub-milli-arcsecond astrometry in the Galaxy and the Galactic Center. From our VLA monitoring we have found two sources with consistently strong emission. These will be suitable VERA 43 GHz phase calibrators if their emission is unresolved also on VERA baselines. This is currently being investigated with VLBA observations.

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