Space distribution of OH absorption in the source NGC 6334

Details Space distribution of OH absorption in the source NGC 6334 Space distribution of OH absorption in the source NGC 6334

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sva....19...14s&link_type=abstract

(Astronomicheskii Zhurnal, vol. 52, no. 1, 1975, p. 26-33.) Soviet Astronomy, vol. 19, July-Aug. 1975, p. 14-17. Translation.

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Astronomical Maps, Hydroxyl Emission, Nebulae, Radio Sources (Astronomy), Spatial Distribution, Circular Polarization, Maser Outputs, Radial Velocity, Ultrahigh Frequencies

Scientific paper

A map of the NGC 6334 region is constructed in the 1667-MHz OH line in both circular polarizations and in the 1665-MHz line in the left circular polarization, and right ascension scans are made through the center of the source in the 1612 and 1720-MHz satellite lines. A narrow spectral feature at a radial velocity of 5.5 km/sec is found to have a uniform optical depth across the source and appears in a large diffuse cloud situated between the sun and the source. A deeper and wider feature at a radial velocity of -4 km/sec (the radial velocity of the source continuum) is found in 2 or 3 compact OH clouds 1 or 2 pc in extent. Two centers of OH maser emission, NGC 6334 N and S, are located inside clouds with a high total hydrogen density (possibly in molecular form), which is typical for dense dust clouds. Absorption in the 1720-MHz satellite line is found to be greater than expected by a factor of 2, while absorption in the 1612-MHz line is detected only in cloud 3, which surrounds the NGC6334 S maser source.

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