We present the first results of our 3D Monte Carlo maser radiative transfer code, used to model the 1612 MHz OH maser shell and the amplification of emission from the stellar radio-photosphere.

We report the first study of OH(1720 MHz) masers in the LMC in order to probe regions where supernova remnants interact with adjacent molecular clouds. Using the ATCA, we observed four sources in the LMC and detected a single OH(1720 MHz) maser with a flux density of 377 mJy toward 30 Doradus. No main line emission at 1665 or 1667 MHz was detected. The observed OH(1720 MHz) maser emission from ...

Geometrical and physical properties of dusty tori of Seyfert nuclei probed by the water vapor maser emission at 22 GHz are discussed. We assume that the dusty torus has a simple cylindrical form and the maser emission can be detected only when we observe the torus from almost edge-on views. The observed low frequency of occurrence of the water vapor maser emission (less than 10 percent) suggest...

On this paper, we present simultaneous VLBA observations of the J=1–0 and J=2–1 rotational lines in the v=1 and v=2 vibra-tionally excited states of SiO (at λ ∼ 7 and 3 mm). We have mapped these four maser lines in the circumstellar envelopes of three AGB stars: IRC +10011, χ Cyg and TX Cam. We study the relative spatial distribution between these maser lines. In particular, for the two v=1 tra...

We report the observed results of a short time scale monitoring of the 22 GHz water maser emission in W3(OH) and NGC 6334C. Both sources were monitored daily for about a month. The aim of the observations is to investigate the possible presence of very short interval variations on time scales of hours or days. Our observations showed that the flux density of the component at –52.8 km s−1 in W3(...

The performance of a room temperature, zero-field MASER operating at 1.45 GHz has been examined. Nanosecond laser pulses, which are essentially instantaneous on the timescale of the spin dynamics, allow the visible-to-microwave conversion efficiency and temporal response of the MASER to be measured as a function of excitation energy. It is observed that the timing and amplitude of the MASER out...

We present a survey of the polarization properties of mm-wavelength methanol masers, comprising both classes, and transitions from 84.5 to 157.0 GHz. Linear polarization is found in more than half of the observed objects, and circular polarization is tentatively detected in two sources. Class I and Class II CH3OH masers show similar polarization properties. The largest linear polarization is fo...

We report near-infrared molecular hydrogen and Brackettg observations towards the massive star formation site G323.7420.26. The region contains an H II region, ,30 arcsec across, and two Class II methanol maser sites, which are separate from the H II region. We show that the spectral type of the star powering the H II region is B0. We also show that at least one of the maser sites is powered by...

We report the first detection of an extragalactic millimeter wavelength H 2 O maser at 183 GHz towards NGC 3079 using the Submillimeter Array (SMA), and a tentative submillimeter wave detection of the 439 GHz maser towards the same source using the James Clerk Maxwell Telescope (JCMT). These H 2 O transitions – 2 – are known to exhibit maser emission in star-forming regions and evolved stars. N...