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LBA observations of OH masers in the star-forming region OH 330.953–0.182

Published online by Cambridge University Press:  01 March 2007

B. Hutawarakorn Kramer ,
J. L. Caswell ,
A. Sukom  and
J. E. Reynolds
B. Hutawarakorn Kramer
Affiliation:
National Astronomical Research Institute of Thailand, Physics Building, Chiang Mai University 50200, Thailand email: [email protected]
J. L. Caswell
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia email: [email protected]; [email protected]
A. Sukom
Affiliation:
Department of Physics, Chiang Mai University 50200, Thailand
J. E. Reynolds
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia email: [email protected]; [email protected]
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Abstract

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OH masers are sensitive probes of the kinematics, physical conditions, and magnetic fields in star-forming regions. The maser site OH 330.953-0.182 has been studied using the Long Baseline Array of the Australia Telescope National Facility. Simultaneous observations of the 1665- and 1667-MHz hydroxyl ground-state transitions yield a series of maps at velocity spacing 0.09kms−1, in both right- and left-hand circular polarization, with tenth-arcsec spatial resolution. Several clusters of maser spots have been detected within a five-arcsec region. Eight Zeeman pairs were found, and in one case, at 1665 MHz, there is a nearby 1667-MHz pair indicating a similar value of magnetic field and velocity. Over the whole site, all magnetic field estimates are toward us (negative), and range from -3.7 to -5.8 mG. We also compared the morphology and kinematics of the 1665- and 1667-MHz maser spots with those from the excited state of OH at 6035 MHz and from methanol at 6668 MHz.

Keywords

OH masersstar-forming regionOH 330.953-0.182magnetic field
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 162 - 163
Copyright
Copyright © International Astronomical Union 2008

References

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