A High-resolution Ammonia-maser- Spectrum Analyzer

High Resolution Optical Spectrum Analyzer (OSA) /Optical Complex Spectrum Analyzer (OCSA)

The molecular environment of H2O masers: VLA ammonia observations

We present the results of single dish and interferometric observations of ammonia towards 5 sources selected from a sample of H2O andOHmasers associatedwith star forming regions. The Medicina telescope was used to observe the NH3(1,1), (2,2), and (3,3) inversion transitions. High resolution maps in the NH3(2,2) and (3,3) lines and in the 1.3 cm continuum were then obtained with the Very Large A...

Astrophysical water masers : Line profiles analysis

The changes in the spectral line profile of the 22 GHz H 2 O maser are calculated as a function of emerging maser flux. We address not only the narrowing and re-broadening of the maser lines, but also the deviations of Gaussian symmetry as a result of the various hyperfine components of the 22 GHz maser line. Non-LTE models of the H 2 O maser transition, including hyperfine structure and cross-...

Hot ammonia in NGC 6334 I & I ( N )

Aims. The massive twin cores NGC6334I and I(N) are in different evolutionary stages and hence ideal targets to study evolutionary variations within the same larger-scale environment. Here, we study the warm, compact gas components. Methods. We imaged the two regions with the Australia Telescope Compact Array (ATCA) at high angular resolution in the NH 3 (3,3) to (6,6) inversion lines. Results. ...

Experimental considerations for 2-D acoustooptic spectrum analysis.

A 2-D acoustooptic spectrum analyzer with the associated reference function generator and real-time image processor has been constructed. The operation of the analyzer and the experimental considerations for obtaining a high resolution spectrum in real time are described.