optically violent variable (OVV) quasar
kuâsâr-e vartande-ye nurâné surâ
Fr.: quasar variable optiquement violent
A member of a small subset of quasars consisting of bright radio galaxies whose flux of visible light output can vary by as much as 50% in a single day.
M.E., from O.fr. violent, from L. violentus "vehement, forcible."
Surâ, from Av. sūra- "strong, powerful, mighty;" cf. Skt. śūra- "strong, powerful, valiant."
Fr.: galaxie violente
A type of galaxy that releases a tremendous amount of energy, on the average 1058 ergs, compared with a supernova release of 1049 ergs. Violent galaxies include quasars and exploding galaxies. About 1 percent of the galaxies are classified as violent. The nearest violent galaxy is Cen A.
violent interstellar environment
pargir-e andar-axtari-ye surâ
Fr.: environnement interstellaire violent
A description of the interstellar medium justified by the presence of supersonic shock waves, massive star winds, turbulence, supernova explosions, etc.
Fr.: relaxation violente
A process in which a dynamical system made up of many objects (star cluster, galaxy cluster) rapidly relaxes from a chaotic initial state to a quasi-equilibrium.
violent star formation
diseše surâ-ye setâregân
Fr.: formation violente d'étoiles
The concept of star formation pertaining to a variety of systems (OB associations, giant H II regions, H II galaxies, massive star clusters, etc.) that are believed to have formed large numbers of stars in a very short time.