power-law elliptical galaxy
kahkešân-e beyzigun bâ qânun-e tavâni
Fr.: galaxie elliptique en loi de puissance
An → elliptical galaxy whose → surface brightness can be approximated by a single → power law at small radii (r ≤ 10-20''). More modern interpretations have emphasized that these profiles can be better understood as the inward continuation of the galaxy's overall → Sersic profile, usually modified by an additional, nuclear-scale stellar component (S. P. Rusli et al., 2013, AJ 146, 160).
Fr.: pouvoir de résolution, pouvoir séparateur
A measure of an optical system's ability to produce an image which separates two points or parallel lines on the object.
rotation-powered pulsar (RPP)
tapâr-e carxeš-tavân, pulsâr-e ~ ~
A → neutron star that is spinning down as a result of → torques from → magnetic dipole radiation and particle emission. RPPs derive their energy primarily from the → rotation of the neutron star. The energy from their → spin-down appears as broad-band pulsations from → radio to → gamma-ray wavelengths and as a → wind of energetic particles flowing into their surrounding → pulsar wind nebulae. Since the discovery of RPPs through their radio → pulsations in 1967, more than 2000 → radio pulsars are now known with periods ranging from a few milliseconds to several seconds (A. K. Harding, 2013, Front. Phys. 8, 679).
Fr.: puissance solaire
Any power obtained by converting solar radiation into useful power.
Fr.: puissance de son
sound power level
tarâz-e tavân-e sedâ
Fr.: niveau de la puissance de son
The sound energy emitted by a sound source per unit time and expressed in → decibels. Sound power, in → watts, is converted to sound power level in decibels (L), by L = 10 log (W/W0), where W0 is the reference power (1 x 10 -12 watt).
Fr.: pouvoir d'arrêt
A quantity indicating the extent with which a substance absorbs a → charged particle passing through it. It is the energy lost by a → non-relativistic particle per unit length of its path in the substance.