Strong magnetic fields in interstellar H2O maser clumps

Details Strong magnetic fields in interstellar H2O maser clumps Strong magnetic fields in interstellar H2O maser clumps

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..333f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 333-338.

Astronomy and Astrophysics

Astrophysics

100

Interstellar Magnetic Fields, Interstellar Masers, Water Masers, Zeeman Effect, Electron Transitions, Field Strength, Molecular Rotation, Power Spectra

Scientific paper

The detection of Zeeman splitting in the 6(16)-5(23) rotational transition of interstellar H2O masers is reported. The measurements of the Stokes parameters for circular polarization (V,I) were performed at the MPIfR 100-m telescope. Depending on the hyperfine transition that is actually masing, typical magnetic field strengths of B(parallel) = about 50 mG (F = 7 - 6) and 80 mG (F = 6 - 5) are derived. Equipartition between magnetic, thermal, and (nonthermal) kinetic energy is indicated, and during the short-lived maser phenomenon the field stays coupled to the high-density masing layer. The implication of these results in terms of an evolutionary correlation between gas density and field strength is discussed. Due to the fields inferred here, current maser pump scenarios may have to be reconsidered.

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