Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..659m&link_type=abstract
Astronomy Reports, vol. 48, Issue 8, p.659-664
Astronomy and Astrophysics
Astronomy
Scientific paper
The structure of the ejector region in the active star-forming region Orion KL has been studied over a broad dynamic range with a high angular resolution of 0.1 milliarcsec, or 0.05 AU. The line profile of the H2O supermaser emission has broad wings and can be represented as a superposition of two Gaussians with frequency widths Δf 1=31 kHz and Δf 2=163 kHz. The line intensities are I 1≈3×105 Jy/beam and I 2≈400 Jy/beam, and the brightness temperatures, T b1≈5×1016 K and T b2≈6×1014 K. The broadband ejector emission is determined by a rotating bipolar outflow with a rotational period of 5 months. The ejector emission in the 31-kHz component at a velocity of 7.64 km/s is amplified by more than two orders of magnitude by the surrounding envelope. The maser amplification regime is partially saturated.
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