Stimulated Raman scattering of water maser lines in astrophysical plasmas

Autor:	Shuji Deguchi, R. T. Gangadhara, Harald Lesch
Rok vydání:	1999
Předmět:	Physics Electron density Astrophysics (astro-ph) FOS: Physical sciences Plasma Astrophysics Condensed Matter Physics Galaxy law.invention symbols.namesake law Brightness temperature Radiative transfer symbols Atomic physics Maser Astrophysics::Galaxy Astrophysics Raman scattering Line (formation)
Zdroj:	Physics of Plasmas. 6:4088-4093
ISSN:	1089-7674 1070-664X
Popis:	Radiative transfer equations are derived and solved for the stimulated Raman scattering of water maser lines in the astrophysical plasmas with electron density of about 10^6 - 10^7 cm-3. In stimulated Raman scattering, the energy of water maser line is transferred to the side band modes: Stokes mode and anti-Stokes mode. The Stokes mode is easily produced by backward Raman scattering while the anti-Stokes mode is created by the interacting intersecting masers in the plasma. The intensity of the Stokes mode is higher than that of the anti-Stokes mode. These side band modes are proposed as explanation for the extreme velocity features observed in the galaxy NGC 4258. The threshold value of the brightness temperature for the Raman scattering is about 10^16 - 10^19 K, and it is satisfied in the case of NGC 4258. Comment: 12 pages, 4 Postscript figures. Accepted for Physics of Plasmas
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67869c56739551ac0a8f13bb3b88add3 https://doi.org/10.1063/1.873670 Zobrazit plný text záznamu