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Z8 GND 5296

z8_GND_5296
Image illustrative de l’article Z8 GND 5296
La galaxie z8_GND_5296 prise par le téléscope spatial Hubble
Découverte
Date
Observation
(Époque J2000.0)
Ascension droite 12h 36m 37,9s
Déclinaison 62° 18′ 08,5″
Vitesse radiale ? (à renseigner)
Distance 13,1 milliards d'années-lumière (distance parcourue par la lumière émise = distance apparente)
30 milliards d'années-lumière (distance comobile actuelle)
Magnitude app. 25,6
Constellation Grande Ourse
Redshift 7,51

Localisation dans la constellation : Grande Ourse

(Voir situation dans la constellation : Grande Ourse)
Caractéristiques
Masse 1,0+0,2−0,1×109 M

z8_GND_5296, découverte en 2013, serait l'une des galaxies les plus éloignées de la nôtre et l'une des plus vieilles actuellement connues. En effet, elle se serait formée seulement 700 millions d'années après le Big Bang[1], soit il y a 13,1 milliards d'années. Cette valeur résulte de son décalage vers le rouge observé à une valeur de 7,51. En raison de l'expansion de l'Univers, la galaxie, située donc à une distance apparente de 13,1 milliards d'années-lumière, se trouverait en réalité actuellement à une distance comobile d'environ 30 milliards d'années-lumière de la Terre. Elle serait riche en métaux et générerait un nombre surprenant de nouvelles étoiles (taux de formation 100 fois plus élevé que celui de la Voie lactée[2]).

Découverte

Annoncée le , elle a été découverte grâce à la spectroscopie par une équipe d'astronomes de l'université de Californie à Riverside, dirigée par Bahram Mobasher et Naveen Reddy en collaboration avec des astronomes de l'université du Texas à Austin, de l'université Texas A&M et du National Optical Astronomy Observatory en utilisant le télescope spatial Hubble. Son existence a été confirmée par l'observatoire W. M. Keck à Hawaï en utilisant l'instrument MOSFIRE[3].

Notes et références

Voir aussi

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