Open AccessOH masers associated with bipolar outflow in ON1
Author(s) -
Nammahachak S.,
Asanok K.,
Hutawarakorn Kramer B.,
Cohen R. J.,
Muanwong O.,
Gasiprong N.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10740.x
Subject(s) - maser , physics , zeeman effect , position angle , astrophysics , outflow , bipolar outflow , magnetic field , polarization (electrochemistry) , very long baseline interferometry , astronomy , star formation , galaxy , chemistry , quantum mechanics , meteorology
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 H ii 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.