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Modelling interstellar water masers
Astrophysics and Space Science, 1995Radiative transfer calculations for interstellar H2O have been performed using accelerated A-iteration (ALI) techniques. The results show strong maser action from known maser transitions, as well as predicting new strong maser transitions for ν > 1.5 THz. © 1995 Kluwer Academic Publishers.
Yates, JA, Gray, MD, Field, D
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Water masers in the Saturnian system [PDF]
Astronomy and Astrophysics, 2009 Context. The presence of water has long been seen as a key condition for life in planetary environments. The Cassini spacecraft discovered water vapour in the Saturnian system by detecting absorption of UV emission from a background star. Investigating other possible manifestations of water is essential, one of which, provided physical conditions are ...
S V Pogrebenko +2 more
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Interstellar hydroxyl and water masers and formaldehyde masers and dasars
Reports on Progress in Physics, 1974A review of the observational data on anomalous emission by OH, H2O and H2CO molecules and on anomalous absorption by H2CO molecules. Various theories advanced to account for these data and some models of a few particular sources are discussed.
D ter Haar, M A Pelling
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Efficient detection of water masers
Nature, 1988During the past 15 years almost 190 natural sources of 22 GHz water maser emission have been found in the dusty circumstellar shells of late-type stars undergoing mass-loss. Numbered among these sources are ∼75% of the Mira variables within 400 pc of the Sun1, although only 34% of Miras in general are associated with OH masers2.
B M Lewis, D Engels, Lewis B M
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Water masers in red supergiants
Astronomical and Astrophysical Transactions, 2006Results of long-term monitoring of circumstellar water maser sources in red supergiants are reviewed. The observations were carried out in 1980–2006 on the RT-22 radio telescope at Pushchino Radio Astronomy Observatory. We discuss the results for the semiregular variable M-supergiant VX Sgr and non-variable M-supergiant IRC–10414.
G M Rudnitskij, V A Samodurov
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Water Masers in the Galactic Center
Proceedings of the International Astronomical Union, 2022AbstractThe Central Molecular Zone (CMZ) makes up roughly the inner 500 pc of the Milky Way and has a large amount of dense hot gas, strong magnetic fields, and highly energetic particles. The Survey of Water and Ammonia in the Galactic Center (SWAG) is a major imaging line survey using the Australia Telescope Compact Array with the goal to map out the
Dylan Ward, Jürgen Ott, David S. Meier
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1993
The excitation of maser emission in millimeter and submillimeter transitions of interstellar and circumstellar water is considered. Using an escape probability method, the equilibrium populations in 349 rotational states of both ortho- and para-water have been determined under varying conditions of gas temperature, density, water abundance and ...
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The excitation of maser emission in millimeter and submillimeter transitions of interstellar and circumstellar water is considered. Using an escape probability method, the equilibrium populations in 349 rotational states of both ortho- and para-water have been determined under varying conditions of gas temperature, density, water abundance and ...
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1993
The circumstellar envelopes of a sample red giants and supergiants have been investigated using MERLIN 22GHz H2O maser observations and single dish observations of the 22, 321, and 325GFfz water maser lines. The MERLIN data shows that inner circumstellar envelopes are generally asymmetrical with evidence for discs and bipolar outflows among the ...
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The circumstellar envelopes of a sample red giants and supergiants have been investigated using MERLIN 22GHz H2O maser observations and single dish observations of the 22, 321, and 325GFfz water maser lines. The MERLIN data shows that inner circumstellar envelopes are generally asymmetrical with evidence for discs and bipolar outflows among the ...
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1999
Maser phenomena in the universe are very general actions often occurring in molecular gases under the condition of population inversion. The emission mechanisms of astronomical masers, including mega masers, do not have any direct relations to the relativity or black hole physics.
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Maser phenomena in the universe are very general actions often occurring in molecular gases under the condition of population inversion. The emission mechanisms of astronomical masers, including mega masers, do not have any direct relations to the relativity or black hole physics.
openaire +1 more source