Accurate H/sub 2/O source positions in W3

Journal Article · Mon Aug 01 04:00:00 EDT 1977 · Astrophys. J., Lett.; (United States)

DOI:https://doi.org/10.1086/182493· OSTI ID:7300299

Forster, J R; Welch, W J; Wright, M C.H.

The Hat Creek interferometer has been used to obtain H/sub 2/O source postions accurate to a few tenths of an arc second in the W3 region. The H/sub 2/ sources in W3(cont) are close to IRS 5. In W3 (OH) the H/sub 2/O sources are 6'' from the main compact H II region. We also obtain absolute positions for the OH sources accurate to about 0.5'' and find that they lie at the edge of the compact H II region. We argue that the excitation of the H/sub 2/O masers is internal since the available pumping radiation from the nearby UV and IR sources is too small to provide the large microwave power. On the other hand, if the pump source is internal to the maser region is W3(OH), then we find that the IR emission expected from three representative models is in conflict with available upper limits.

• Research Organization: Radio Astronomy Laboratory, University of California, Berkeley
• OSTI ID: 7300299
• Journal Information: Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 215:3; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ENERGY-LEVEL TRANSITIONS
H2 REGIONS
INFRARED RADIATION
INTERFEROMETRY
MASERS
MATHEMATICAL MODELS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
NUCLEAR MODELS
RADIATIONS
SPHERICAL MODEL
STAR MODELS