OH masers associated with bipolar outflow in ON1

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetic Fields: Masers: Polarization: Stars: Formation: Ism: Individual: On1: Ism: Jets And Outflows, Magnetic Fields, Masers, Polarization, Stars: Formation, Ism: Individual: On1, Ism: Jets And Outflows

Scientific paper

Multi-Element Radio-Linked Interferometer Network polarization measurements of the OH 18-cm masers in ON1 are presented. OH maser emission is detected in all four ground state lines. The bulk of the masers lie in an elongated distribution covering 2 arcsec at position angle 130°, near the southern edge of the ultracompact HII region. The maser distribution is orthogonal to the bipolar outflow seen in HCO+ at position angle (PA) 44°. An isolated group of 1720-MHz masers is also seen 6 arcsec to the east. The magnetic field deduced from Zeeman splitting of the OH maser lines shows a large-scale order, with field values ranging from -0.4 to -4.6 mG.

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