An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A nuclear reaction whose probability is enhanced at an energy corresponding to an energy level of one of the nuclei. → resonance capture.

Resonant, verbal adj. of → resonate; → reaction.

A process whereby stellar orbit relaxation can be dramatically enhanced in orbits in a nearly Keplerian star cluster close to a → massive black hole (MBH). This process can modify the angular momentum distribution and affect the interaction rates of the stars with the MBH more efficiently than non-resonant relaxation. In the standard relaxation picture, each encounter is random and uncorrelated, so stars undergo a random walk. Relaxation is driven by the diffusion of energy which then leads to angular momentum transfer. However, in a stellar cluster around a MBH, each star will be on a Keplerian orbit, which is a fixed ellipse in space. The orbits of two nearby stars will thus exert correlated torques on one another, which can lead to a direct resonant evolution of the angular momentum. Since resonant relaxation increases the rate of angular momentum scattering, stars reach highly eccentric orbits more rapidly where they can become → extreme mass ratio inspiral (EMRI)s (Rauch, K.P., Tremaine, S., 1996, arXiv:astro-ph/9603018; Gair J.R. et al. 2013, Living Rev. Relativity, 16, (2013), 7 http://www.livingreviews.org/lrr-2013-7, doi:10.12942/lrr-2013-7).

→ resonant; → relaxation.

The absorption and prompt re-emission of photons of a particular wavelength by an atom. In this process, a photon of exactly the right wavelength (i.e. energy) excites an electron in the atom from one energy level to another. The electron then drops back down to its original energy level more or less immediately, emitting a photon of almost identical energy to the one that was absorbed in the first place, but in some random direction. Resonant scattering applies only to line radiation, unlike other forms of scattering which are of continuous radiation (Oxford Dictionary of Astronomy, 2 ed.).

→ resonant; → scattering.

To produce or exhibit mechanical, electrical, or chemical resonance, or cause a system to produce or exhibit resonance.

Verbal form of → resonance.

The absorption of a material by a medium or system after having been released from absorption by that same medium or system. → absorption; → desorption; → sorption.

Verbal noun of resorb, from L. resorbere, from → re- + sorbere "to swallow, suck up."

Bâzšam, from bâz "again, back," → re-, + šam, variant of zšâm, as in âšâm, âšâmidan "to drink, to sip;" Av. šam- "to drink, sip, swallow;" Skt. cam, camati "to sip, dirink, lick up, absorb."

The act of responding; response.

→ respond; → -ence.

Pâsoxguyi, noun from pâsoxgu, → respondet.

1) A person who responds or makes reply.
2) Law: A defendant, especially in appellate and divorce proceedings (Dictionary.com).

Agent noun related to → respondence.

Pâsoxgu, from pâsox, → responce, + gu "speaker, teller," from goftan "to tell, speak, talk," → -logy.

The component of a radar system that returns the signals used to detect and locate objects.

Agent noun of respond, → response.

Pâsoxgu, from pâsox, → response, + gu agent noun and present stem of goftan "to say, speak, relate, tell; to compose a poem," from Mid.Pers. guftan "to say, tell, utter;" O.Pers. gaub- "to say."

Any → reaction of a → system to an external → stimulus. See also:
→ instrumental response function, → peripheral response, → response curve, → response time, → spectral response.

From L. responsum "answer," noun use of neuter p.p. of respondere "answer to, promise in return," from → re- "back" + spondere "to pledge."

Pâsox "answer, response;" Mid.Pers. pâssox "answer, reply;" loaned in Arm. patasxani "answer;" Proto-Iranian *pati-sanh-, from *pati- "agaist, back, opposite to, toward, face to face, in front of," → anti-, + *sanh- "to declare, say;" Mod.Pers. soxan "speech, utterance, word," → speech.

A curve graphically representing the magnitude of the → response of a → detector to → radiation, usually as a function of → wavelength.

→ response; → curve.

The time between an occurrence and a reaction produced by the occurrence.

→ response; → time.

1) The state or fact of being responsible, answerable, or accountable for something within one's power, control, or management.
2) An instance of being responsible.
3) A person or thing for which one is responsible (Dictionary.com).

→ responsible; → -ity.

1) Answerable or accountable, as for something within one's power, control, or management.
2) Involving accountability or responsibility (Dictionary.com).

→ response; → -able.

1) Responding especially readily and sympathetically to appeals, efforts, influences, etc.
2) Physiology: Acting in response, as to some stimulus.
3) Characterized by the use of responses (Dictionary.com).

→ response; → -ive.

A performance criterion for an electronic detector, the ratio of the detector's electrical output to its optical input.

→ responsive; → -ity.

The act or process of restoring such as → image restoration.

Verbal noun of → restore.

The act of restricting, the state or the condition of being restricted.

Verbal noun, → restrict + → -tion.

An acceleration that results from the vector addition of two or more distinct accelerations.

→ resultant; → acceleration.

The act of retarding or state of being retarded. → retardation plate.

Verbal noun of → retard.

Same as → wave plate.

→ retardation; → plate.