Magnetic fields in methanol maser condensations based on data for related regions. Seven sources: Astrophysical parametersстатья
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Дата последнего поиска статьи во внешних источниках: 5 февраля 2015 г.
Аннотация:The astrophysical parameters of seven OH maser condensations are
estimated based on magnetic fields obtained from polarization
observations carried out on the Nan cay Radio Telescope (France) in the
1665 and 1667 MHz lines in four Stokes parameters. Regions in the
studied sources containing the observed clusters of maser condensations,
as well as clusters of Class I and II methanol masers, have been
identified. The associations of the masers are real; i.e., the magnetic
field in the clusters can also extend to groups of methanol masers. The
linear dimensions of these associations have been found. The ratio of
the mass to the magnetic flux, ratio of the thermal to the magnetic
pressure, and virial relationships between energies (kinetic, magnetic,
and gravitational) in the regions containing the OH and methanol masers
have been obtained. In sources whose magnetic fields have been
determined fairly reliably, the ratio of the mass to the magnetic flux
exceeds a critical value, and the energies of chaotic motions and of the
magnetic field are considerably smaller than the gravitational binding
energy. On the other hand, in all cases, the ratio of the thermal to the
magnetic pressure is < 1, suggesting that the clouds may be in
amagnetically dominated regime. This inconsistency is related to
probable uncertainties in the the magnetic field values and the
estimated distances to the sources, which may lead to overestimation of
the sizes of the regions studied.