Highly Polarized Burst of a Water Maser in Orion-KL

Details Highly Polarized Burst of a Water Maser in Orion-KL Highly Polarized Burst of a Water Maser in Orion-KL

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..545h&link_type=abstract

Publications of the Astronomical Society of Japan, v.52, p.545-550.

Astronomy and Astrophysics

Astronomy

6

Ism: Individual (Orion-Kl), Masers, Polarization, Stars: Formation

Scientific paper

It has been reported that the 22 GHz water maser in the star-forming region Orion-KL has started an outburst (Omodaka et al. 1998, IAU Circ. 6893). We measured the linear polarization of the maser after the burst, during a phase of rapid flux density decrease. We found that the total flux density of 2.4 times 106 Jy (1998 December) exhibits about 46% linear polarization. Over the next six months we found that the total intensity decrease by about two orders of magnitude, while the fractional linear polarization gradually fell to 30%. These results suggest that the present bursting phenomenon has an origin similar to the super-maser event starting in 1979, and that the phenomenon of the extremely bright masers in this region is geometric in nature and related to a strong magnetic field.

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