Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sva....21..164p&link_type=abstract
(Astronomicheskii Zhurnal, vol. 54, Mar.-Apr. 1977, p. 297-300.) Soviet Astronomy, vol. 21, Mar.-Apr. 1977, p. 164-166. Transla
Astronomy and Astrophysics
Astronomy
2
Centimeter Waves, Hydroxyl Emission, Interstellar Masers, Radio Sources (Astronomy), Astronomical Models, Circular Polarization, Radial Velocity, Radio Telescopes, Supernova Remnants, Water Masers
Scientific paper
Results are reported for 18-cm radio observations of the OH maser source in W48. Measurements were made in the OH lines at 1612, 1665, 1667, and 1720 MHz in both circular polarizations over the radial-velocity range from 10 to 75 km/s relative to the local standard of rest. The coordinates obtained for the OH source indicate that W48 OH is located at the edge of an H II region but apparently not in the same place as the H2O maser source. Strong OH absorption in the 1665-, 1667-, and 1720-MHz lines were observed at the same radial velocities as the OH maser emission. Noting that H109-alpha recombination-line emission from the W48 H II region and strong OH and H2CO absorption in the direction of the W44 supernova remnant have been observed at the same radial velocity as some of the reported OH absorption, it is suggested that W48 and W44 are physically related and embedded in a single large cloud of neutral gas located about 3 kpc from the sun.
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