VLBI aperture synthesis observations of the OH maser source W75 N

Journal Article · Sun Feb 15 04:00:00 EST 1981 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158686· OSTI ID:6337920

Haschick, A D; Reid, M J; Burke, B F; Moran, J M; Miller, G

We conducted very long baseline interferometric (VLBI) observations of the OH maser source in W75 N at 1665 MHz. The OH emission was mapped with aperture synthesis techniques using a seven station array of telescopes across the United States which provided a synthesized beam of approx.0.''015 diameter. The maser emission consists of nine components in an elongated region that has a major axis of 1.''5 (0.15 pc) and a position angle of 20/sup 0/. The maser components systematically increase in velocity from 3.8 to 13.2 km s/sup -1/ along this axis. The absolute position of the OH maser source was measured to an accuracy of 0.''2, confirming the association of the OH maser with the ultracompact H II region W75 N. Very large array observations of the continuum emission from W75 N at 4885 MHz indicate that the OH maser components are aligned with an extension of the ultracompact H II region. Our observations suggest that a binary protostellar system may excite the H II region, and that the OH maser reside in a rotating disk of remnant material out of which the binary formed.

• Research Organization: Harvard-Smithsonian Center for Astrophysics and Research Laboratory of Electronics, Massachusetts Institute of Technology
• OSTI ID: 6337920
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 244:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
BINARY STARS
COSMIC RADIO SOURCES
ELECTRONIC EQUIPMENT
EMISSION
EQUIPMENT
H2 REGIONS
HYDROXYL RADICALS
INTERFEROMETRY
MAGNETIC FIELDS
MAPS
MASERS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
POLARIZATION
RADICALS
STARS
ZEEMAN EFFECT