Results 141 to 150 of about 173 (158)

Radiative instabilities in astrophysical masers

1993
We have previously found that the solutions to the equations of radiative transfer for astrophysical masers are unstable. Here, we provide additional information on the behavior of the interior of the masing region during the variations that result from the instability.
Gerardo A. Scappaticci, William D. Watson   +1 more
openaire   +1 more source

An electron cyclotron maser instability for astrophysical plasmas

The Physics of Fluids, 1983
The electron cyclotron maser instability is analyzed for a plasma which consists of a suprathermal electron component characterized by velocity-space anisotropies in directions both parallel and perpendicular to the ambient magnetic field, as well as a high-density thermal plasma in which ωe∼Ωe (where ωe and Ωe are the electron plasma and cyclotron ...
Freund, H. P., Wong, H. K., Wu, C. S., Xu, M. J.   +3 more
openaire   +1 more source

Polarization Properties of Astrophysical Masers

1973
Observed interstellar OH and H2O maser lines at 18 cm and 1.35 cm exhibit unusual polarization properties. The OH emitters with the highest brightness temperatures, usually associated with H II regions, almost always show a high degree of circular polarization. The H2O maser line, on the other hand, is rarely polarized, and then only linearly polarized.
openaire   +1 more source

Plasma-maser effects in plasma astrophysics

Space Science Reviews, 1986
The role of a new mode coupling effect (plasma-maser) in space plasma physics is reviewed. The new maser effect, the idea that the resonant electrons with the low-frequency mode can amplify the high-frequency mode, does not require population inversion of electrons. The generation mechanisms of ULF modulated ELF emissions, auroral kilometric radiation,
openaire   +1 more source

The Extensive Database of Astrophysical Maser Sources (eDAMS): the First Release on Circumstellar Maser Sources

Proceedings of the International Astronomical Union, 2017
AbstractWe introduce the newly developed database of circumstellar maser sources. Until now, the compilations comprehensively including the three major maser species in evolved stars (i.e., SiO, H2O, OH) has been practically limited only to the Benson’s catalog (Benson et al. 1990), which was published more than a quarter of a century ago.
J. Nakashima, D. Engels, C.-H. Hsia, H. Imai, D. A. Ladeyschikov, A. M. Sobolev, B. H. K. Yung, Y. Zhang   +7 more
openaire   +1 more source

Cosmic MASERS - A Powerful Tool For Astrophysics

1996
Abstract Cosmic masers were discovered accidentally in 1965 by radio astronomers who were trying to map the distribution of gas in molecular clouds by measuring the absorption due to OH molecules against thermal background sources [Weaver et al., 1965, Gundermann, 1965].
openaire   +1 more source

3D Models of Astrophysical Masers with Polarization

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022), 2023
Malcolm Gray, Kitiyanee Asanok, Montree Phetra, Thanapol Chanapote, Sandra Etoka, Bannawit Pimpanuwat   +5 more
openaire   +1 more source

Erratum: Statistical nature of astrophysical maser radiation for linear masers

Canadian Journal of Physics, 1993
openaire   +1 more source

Modifications to the relationship between the magnetic field and weak Zeeman features in the spectra of astrophysical masers

Astrophysical Journal, 1990
Gerald E Nedoluha, William D Watson
exaly  

Radiative instabilities in astrophysical masers

Lecture Notes in Physics, 2005
William D Watson
exaly