An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 4 Search : quench
quench
  ۱) اسراندن؛ ۲، ۳) اسریدن؛ ۳) آب دادن   
1) oserândan 2, 3) oseridan; 3) âb dâdan

Fr.: 1) étouffer, découper, étancher, assécher; 2) s'étouffer; 3) tremper   

1a) To put out or extinguish.
1b) Electronics: To terminate the discharge in a vacuum tube by application of a voltage.
2) To become extinguished.
3) To dip a heated object into a liquid to quickly reduce the temperature.

M.E. quenchen, from O.E. acwencan "to quench," form of root of cwincan "to go out, be extinguished."

Oseridan, oserândan, from Yaghnobi oser- "to cool," Wakhi wəsər-/wəsərt "to fade, wither," related to Pers. sard "cold, cool" (Kurd. sar, Baluchi sârt, Ossetian sald "cold" ), afsordan, afsârdan "to congeal;" Mid.Pers. sard/sart "cold;" Av. sarəta- "cold;" cf. Skt. śiśira- "cold;" L. calidus "warm;" Lith. šaltas "cold;" Welsh clyd "warm;" PIE *keltos- "cool."

quench frequency
  بسامد ِ اسرش   
basâmad-e osereš

Fr.: fréquence de découpage   

The frequency at which an oscillation is intermittently quenched, as in a super-regenerative receiver.

quench; → frequency.

quenching
  اسرش   
osereš

Fr.: étouffement, découpage, étanchement, assèchement; trempe   

The process of extinguishing, removing, or diminishing a physical property.

Verbal noun, → quench + → -ing.

star formation quenching
  اسرش ِ دیسش ِ ستارگان   
osereš-e diseš-e setâregân

Fr.: assèchement de formation d'étoiles   

The premature termination of star formation process in some galaxies. The ultimate quenching of star formation is caused by stripping of the gas reservoir which will finally turn into stars. A wide variety of mechanisms have been proposed to provide quenching. For example, → major mergers can transform spiral galaxies into ellipticals, and may also quench future star formation by ejecting the → interstellar medium from the galaxy via starburst, → active galactic nucleus, or shock-driven winds. In rich clusters, where merging is less efficient because of the large relative velocities of galaxies, rapid encounters or fly-bys may cause the formation of a bar and growth of a spheroidal component instead of larger scale star formation. Also, cold gas can be stripped out of the galaxy both by tidal forces and ram pressure in the intracluster medium. Similarly, the hot halo that provides future fuel for cooling and star formation may be efficiently stripped in dense environments, thus quenching further star formation (see, e.g., Kimm et al., 2009, MNRAS 394, 1131, arXiv:0810.2794).

star; → formation; → quench.