Context. Magnetohydrodynamical simulations show that the magnetic field can drive
molecular outflows during the formation of massive protostars. The best probe to …

We present new results of a numerical study of the pumping of 4.8 and 14.5 GHz maser of o–
in the presence of a free–free radiation field. It is shown that in the presence of a free–free …

Abstract We present Very Large Array 1.3 cm continuum and 22.2 GHz H 2 O maser
observations of the high-mass protostellar object IRAS 19035+ 0641 A. Our observations …

High-mass stars play an important role in the interstellar medium, but much remains to be
known about their formation. Class I methanol masers may be unique tracers of an early …

Spectral lines from formaldehyde (H2CO) molecules at cm wavelengths are typically
detected in absorption and trace a broad range of environments, from diffuse gas to giant …

Class I methanol masers in high mass star forming regions are generally found in outflows.
There, shocks provide the collisional pumping that causes the population inversion …

Maser action, ie, microwave amplification by stimulated emission radiation, occurs naturally
in interstellar space under non-LTE conditions, velocity coherence is achieved between a …