Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aprs.conf..109k&link_type=abstract
Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium, held at the Institute of Space and astronauti
Astronomy and Astrophysics
Astrophysics
6
Scientific paper
In December 1997 the Orion-KL water maser source was discovered to be undergoing an outburst and, in February 1998, a VSOP observation successfully yielded fringes on the source from HALCA to several VLBA antennas. This confirmed the capabilities of the 22GHz VSOP observing system elements, i.e. phase transfer, onboard frequency stability, and orbit determination accuracy. Following the VSOP observation, we monitored the Orion burst maser with VLBA-only observations at 2 week intervals. The outburst peaked at 5x10^6 Jy in September 1998, and then declined to a few times 10^5 Jy, which is its normal intensity. By tracing the structure and velocity changes of the maser spots from the outburst phase to the declining phase, we find there are two velocity components at the region of the flaring water maser with a 0.2 km/s velocity difference. The separation of two components is observed to decrease as the maser intensity increases and, at the time of the outburst peak, the position of two maser components coincide. This strongly suggests that the overlapping of the two masers causes the luminous outburst.
Diamond Phil J.
Kobayashi Hirotada
Omodaka Toshihiro
Shimoikura Tomomi
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