Radio observations of water vapor, hydroxyl, silicon monoxide, ammonia, carbon monoxide, and compact H II regions in the vicinities of suspected Herbig-Haro objects

Details Radio observations of water vapor, hydroxyl, silicon monoxide, ammonia, carbon monoxide, and compact H II regions in the vicinities of suspected Herbig-Haro objects Radio observations of water vapor, hydroxyl, silicon monoxide, ammonia, carbon monoxide, and compact H II regions in the vicinities of suspected Herbig-Haro objects

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..845r&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 845-865.

Astronomy and Astrophysics

Astronomy

252

Gas Masers, H Ii Regions, Herbig-Haro Objects, Interstellar Gas, Interstellar Masers, Nebulae, Radio Astronomy, Water Masers, Ammonia, Carbon Monoxide, Early Stars, Hydrogen Ions, Hydroxyl Emission, Maser Outputs, Radio Sources (Astronomy), Silicon Oxides

Scientific paper

Systematic radio observations of 24 nebulous objects classified as Herbig-Haro (H-H) objects reveal CO, NH3, and OH lines typical of high-density molecular clouds, but no SiO masers. In nine of the regions high-velocity H2O maser emission was found, with compact radio H II regions usually within 30 arcsec of the masers; OH maser emission is generally not present in the associations of H-H objects, H2O masers, and H II regions. Models of H-H objects are discussed, and calculations indicate that high-velocity H2O masers, if interpreted as ejected fragments, may evolve into H-H objects.

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