Fr.: tore obscurcissant
A structure of dust and gas postulated to surround the central → black hole in an → active galactic nucleus (AGN). The presence of an obscuring torus allows the unification of the two main types of AGNs containing a → broad-line region (Type I) and a → narrow-line region (Type II), respectively. In this unified model, the two types represent the same sort of object, the appearance of which depends on the viewer's → line of sight. The best evidence for this model comes from spectropolarimetry observations of some type II AGNs in which broad → emission lines are seen in → polarized light, as would happen if the broad-line region truly were hidden, and the light were being reflected off the torus and into the viewer's line of sight.
The state or quality of being obscure.
1) General: The character of something that can be observed.
giti-ye nepâhidani, ~ nepâhešpazir
Fr.: univers observable
The extent of the Universe that we can see with the aid of the largest telescopes. Its ultimate boundary is determined by the → cosmic horizon size.
Fr.: observance, observation
1) An act or instance of following a custom, rule, or law.
Nepâhdâri, on the model of negâhdâri "preservation, protection," from nepâhdâr, → observant, + -i.
Fr.: observateur, perspicace
1) Paying strict attention.
1) Act or instance of observing; → observe.
Verbal noun of → observe.
Pertaining to, or founded on observation, especially based on observation rather than theory.
Adj. of → observation.
Fr.: astrophysique observationnelle
That part of astrophysics that is mainly concerned with the collection of observational data, in comparison with theoretical astrophysics
Fr.: biais observationnel
An error in observation arising from systematically favoring brighter or weaker objects or some particular object morphologies; e.g. → Malmquist bias.
Fr.: cosmologie observationnelle
The application of observational data to the study of the Universe as a whole.
Fr.: effet observationnel
A feature appearing in an observation, which is not intrinsic to the object observed, but is due to the inappropriate method used (e.g. limited angular resolution).
Fr.: erreur observationnelle
The difference between a measured value of quantity and its true value.
A place or building equipped for making observations of astronomical, meteorological, or other natural phenomena, especially a place provided with a telescope for observing astronomical objects.
From Fr. observatoire, from L. observa(re), → observe, + -toire, from L. -torius, from -tor a suffix forming agent nouns + -ius adj. suffix.
Nepâhešgâh, from nepâheš, → observation, + -gâh suffix of place (O.Pers. gāθu-, Av. gātav-, gātu- "place, throne, spot" (Skt. gátu- "going, motion; free space for moving; place of abode," PIE *gwem- "to go, come").
To watch carefully or note for a scientific or special purpose, e.g. to observe a star (astronomy), to observe the behavior of a patient (medicine, psychology), an animal (ethology, zoology), social groups (sociology), etc.
From O.Fr. observer, from L. observare "watch over, look to, attend to, guard," from ob "over" + servare "to watch, keep safe," from PIE base *ser- "to protect;" cf. Av. har- "to guard, observe, pay attention to," haraiti "guards, keeps," harətar- "protector, watcher," harəθra- "guarding, protection," hāra- "watched, guarded," Mod.Pers. zinhâr "beware!, mind!," Gk. heros "protector, hero."
Note 1: Observation is the most important basis of empirical sciences. All theories
rely on observation, and must finally be supported by observational evidence.
Persian, in contrast to European languages, lacks a distinct term that recognizes observation
as a conceptual premise of sciences.
In astronomy the Ar. rasad (
Pertaining to a value which has been measured, in contrast to one which is computed.
Past participle of → observe.
nepâhandé, nepâhešgar, nepâhgar
1) Someone or something that observes.
qafas-e nepâhgar, ~ nepâhandé
Fr.: cage d'observateur
A place located either at the top of the tube of a large telescope from where one observes or at the back of the tube where instruments are attached to the → Cassegrain focus.
Fr.: rapport d'observations
A written report provided by a visiting astronomer to the observatory describing how his/her observing run has been carried out.