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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
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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Caswell, J. L. 1998, MNRAS 297, 215CrossRefGoogle Scholar
Caswell, J. L. 2001, MNRAS 326, 805Google Scholar
Caswell, J. L. & Reynolds, J. E. 2001, MNRAS 325, 1346Google Scholar
Hutawarakorn, B. & Cohen, R. J. 1999 MNRAS 303, 845Google Scholar
Nammahachak, S., Asanok, K., Hutawarakorn Kramer, B., Cohen, R. J., Muanwong, O.Gasiprong, N. 2006, MNRAS 371, 619CrossRefGoogle Scholar