2mm Wavelength VLBI of SiO Masers and AGN
Abstract
In April 2002 an array of antennas operating at 129GHz successfully detected VLBI fringes on both continuum AGN and SiO spectral line sources. The 129GHz fringes represent the highest frequency spectral line VLBI detections to date. The array consisted of the University of Arizona Kitt Peak 12m antenna, the Sub Millimeter Telescope Observatory 10m (HHT), and the IRAM 30m dish on Pico Veleta. These observations are the first fringes at any frequency at the SMTO and we discuss the technical challenges involved.
At 129GHz, a number of evolved stars and several young stellar objects exhibit strong SiO maser emission in the v = 1 J = 3-2 transition. Preliminary cross power spectra of VYCMa on the HHT-Kitt Peak baseline (∼190km) are consistent with multiple spatially separate maser spots associated with the star. We discuss phase mapping this emission and the implications for constraining the SiO maser pumping mechanisms and circumstellar dynamics around these objects. Future observations will include continuum observations of the radio source at the Galactic Center, SgrA*, and higher frequency maser lines including HCN and methanol.- Publication:
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Proceedings of the 6th EVN Symposium
- Pub Date:
- June 2002
- DOI:
- 10.48550/arXiv.astro-ph/0207072
- arXiv:
- arXiv:astro-ph/0207072
- Bibcode:
- 2002evn..conf..223D
- Keywords:
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- Astrophysics
- E-Print:
- 4 pages, 3 figures, appears in: Proceedings of the 6th European VLBI Network Symposium held on June 25th-28th in Bonn, Germany. Edited by: E. Ros, R.W. Porcas, A.P. Lobanov, and J.A. Zensus. New version includes all editors in paper header