EVLA Observations of OH Masers in ON 1

Abstract

This Letter reports on initial Expanded Very Large Array (EVLA) observations of the 6035 MHz masers in ON 1. The EVLA data are of good quality, lending confidence in the new receiver system. Nineteen maser features, including six Zeeman pairs, are detected. The overall distribution of 6035 MHz OH masers is similar to that of the 1665 MHz OH masers. The spatial resolution is sufficient to unambiguously determine that the magnetic field is strong (~ -10 mG) at the location of the blueshifted masers in the north, consistent with Zeeman splitting detected in 13441 MHz OH masers in the same velocity range. Left and right circularly polarized ground-state features dominate in different regions in the north of the source, which may be due to a combination of magnetic field and velocity gradients. The combined distribution of all OH masers toward the south is suggestive of a shock structure of the sort previously seen in W3(OH).

4 pages using emulateapj.cls including 2 tables and 2 color figures

References in corpus (6)

• Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: II. Maser Properties and the Interpretation of Polarization
• Structure of W3(OH) from Very High Spectral Resolution Observations of 5 Centimeter OH Masers
• Enhanced density and magnetic fields in interstellar OH masers
• A Very High Spectral Resolution Study of Ground-State OH Masers in W3(OH)
• Excited-state OH Mainline Masers in AU Geminorum and NML Cygni
• Probabilistic Representations of Solutions of the Forward Equations

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• Bipolar outflows as a repulsive gravitational phenomenon -- Azimuthally Symmetric Theory of Gravitation (II)