Results 11 to 20 of about 4,740 (197)
Astrophysical water masers: Line profiles analysis [PDF]
Astronomy & Astrophysics, 2005 The changes in the spectral line profile of the 22GHz H2O 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.
Vlemmings, W. H. T. +1 more
openaire +4 more sources
Interacting masers and the extreme brightness of astrophysical water masers
The Astrophysical Journal, 1989 Extreme surface brightnesses have long been reported for water masers which are well beyond what is found in self-consistent, theoretical investigations of these masers. The transport of maser radiation is calculated when two masers, having the properties inferred for the numerous weaker masers and separated by distances characteristic of the molecular
Shuji Deguchi, William D. Watson
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Saturation and beaming in astrophysical masers. III - Asymmetrically pumped masers
The Astrophysical Journal, 1986 There is reason to believe that the physical conditions in many astrophysical masers are far from homogeneous. In particular, if the maser pump involves the absorption of infrared photons, the pump rate may vary rapidly (perhaps exponentially) across the cloud.
C. Alcock, R. R. Ross
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Spectral line profiles and luminosities of astrophysical water masers
The Astrophysical Journal, 1991 The spectral line narrowing and rebroadening that occurs for astrophysical masers as a function of the emergent radiative flux is calculated for the prominent, 22 GHz masing transition of water. The increased line breadths due to hyperfine structure lead to reliable, essentially model-independent upper limits to the emergent flux that tend to be lower ...
Gerald E. Nedoluha, William D. Watson
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Astrophysical Masers. 11. Polarization Properties
The Astrophysical Journal, 1973 Peter Goldreich +2 more
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Spectra of circularly polarized radiation from astrophysical OH masers
The Astrophysical Journal, 1990 A striking feature of astrophysical masers is the tendency for either one or the other of the circular polarizations to dominate in the radiation from the strong, widely observed masing transitions of OH at 18 cm. Spectral line profiles are calculated for polarized maser radiation due to the combined effects of a velocity gradient and, as is indicated ...
Gerald E. Nedoluha, William D. Watson
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SiO and CH3OH mega-masers in NGC 1068. [PDF]
Nat Commun, 2014 Wang J +6 more
europepmc +2 more sources
Broadband VLA Spectral-line Survey of a Sample of Ionized Jet Candidates
The Astrophysical Journal Supplement Series, 2023 The study of the interaction between ionized jets, molecular outflows, and their environments is critical to understanding high-mass star formation, especially because jets and outflows are thought to be key in the transfer of angular momentum outward ...
E. Sanchez-Tovar +4 more
doaj +1 more source
Amplification of OAM radiation by astrophysical masers [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We extend the theory of astrophysical maser propagation through a medium with a Zeeman-split molecular response to the case of a non-uniform magnetic field, and allow a component of the electric field of the radiation in the direction of propagation: a characteristic of radiation with orbital angular momentum.
Gray M. D. +3 more
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The Australia Telescope campaign to study southern class I methanol masers [PDF]
, 2007 The Australia Telescope Compact Array (ATCA) and the Mopra facility have been used to search for new southern class I methanol masers at 9.9, 25 (J=5) and 104 GHz, which are thought to trace more energetic conditions in the interface regions of molecular
A. B. Ostrovskii +7 more
core +2 more sources