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GALACTIC DISK [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2022-02-24

English

Subject field(s)
  • Astronomy
  • Electromagnetic Radiation
CONT

A blazar is an active galactic, consisting mainly in a supermassive black hole(10 solar masses), of an accretion disk falling onto the black hole, and of interstellar matter lying around, which can for example be modelized by a molecular torus.

French

Domaine(s)
  • Astronomie
  • Rayonnements électromagnétiques
DEF

Radiosource ponctuelle dont le rayonnement, très intense, peut varier en quelques jours d'un facteur allant jusqu'à 100.

OBS

Le blazar est interprété comme un noyau actif de galaxie observé dans l'axe de son jet de matière, ce dernier émettant un rayonnement suivant cet axe.

OBS

blazar : désignation et définition publiées au Journal officiel de la République française le 4 juin 2019.

Spanish

Save record 1

Record 2 2011-07-21

English

Subject field(s)
  • Astronomy
DEF

A galactic disk with a dense center and a spiral structure of gas and dust.

OBS

Three groups of spirals are identified Sa, Sb and Sc.

French

Domaine(s)
  • Astronomie
OBS

Les galaxies sont réparties, suivant leur aspect, en trois grandes catégories: elliptiques, spirales et irrégulières. [...] Les spirales proprement dites, lorsqu'elles sont vues de profil, sont toujours plus aplaties que les nébuleuses elliptiques. Vues de face, leur structure spiralée montre une nette symétrie de révolution.

Spanish

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Record 3 2011-03-08

English

Subject field(s)
  • Astrophysics and Cosmography
DEF

A large, relatively dust-free, spherical region surrounding a spiral galaxy, such as our own [Milky Way].

OBS

The inner, visible part of the halo, which has roughly the same diameter as the galactic disk, is occupied by Population II objects, including globular clusters and old, individual stars. Beyond this is a much larger region, called the dark halo or extended halo, containing large amounts of dark matter, the presence of which is revealed by its gravitational effect on the galaxy's rotation. The nature of galactic dark matter is still undetermined but the most popular theory, supported by some recent observations, is that the dark halo is home to vast numbers of small, unseen bodies known as MACHOs.

French

Domaine(s)
  • Astrophysique et cosmographie
CONT

Le halo galactique est une région de l'espace entourant les galaxies spirales, et notamment notre Galaxie, la Voie lactée. On pense que le halo galactique est principalement constitué d'étoiles, de gaz et de matière noire. Dans une galaxie elliptique, il n'y a pas de transition nette entre le corps de la galaxie et le halo.

Spanish

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Record 4 2001-04-01

English

Subject field(s)
  • Astrophysics and Cosmography
  • Astronautics
DEF

The point in the Galactic plane that lies directly opposite the Galactic center.

OBS

Here we gaze toward the edge of the Galactic disk.

French

Domaine(s)
  • Astrophysique et cosmographie
  • Astronautique
Key term(s)
  • anticentre de la galaxie
  • anti-centre galactique

Spanish

Save record 4

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