The Cheshire Cat / SDSS J1038+4849 (Stephane Neveu)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa)

The Cheshire Cat / SDSS J1038+4849, Stephane Neveu

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The Cheshire Cat / SDSS J1038+4849

Revision title: Cheshire Cat - Crop

Le Chat du Cheshire (SDSS J1038+4849 ) connu aussi sous le nom du "smiley" est une lentille gravitationnelle.
Les deux galaxies géantes (SDSS J103843.58+484917.7 et SDSS J103842.68+484920.2 ) formant les yeux sont aux alentour de magnitude 20 (18 dans le rouge) et séparées de 9 secondes d'arc.
Leur masse déforme la trajectoire de la lumière de galaxies lointaines vues comme des arcs circulaires.
C'est l'un des rares phénomènes naturels permettant de voir la matière déformer l'espace temps tel que prédit par la relativité générale.
Cet ensemble galactique est distant de 4,3 Mds d'années lumière.
Une image qui démontre la qualité exceptionnelle du ciel et de l'instrumentation mise en ouvre à l'Observatoire François Xavier Bagnoud - OFXB.
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The Cheshire Cat is a gravitational lens.
The two giant galaxies (SDSS J103843.58+484917.7 and SDSS J103842.68+484920.2) forming the eyes are around magnitude 20 (18 in the red) and separated by 9 arc seconds.
Francois Xavier Bagnoud Observatory - OFXB.

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Title: Cheshire Cat - Crop

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Société astronomique de France
AAA : Astronomes et Astrographes Amateurs
Astrophotographes (France)

Ciel profond / Deep sky imaging

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The Cheshire Cat / SDSS J1038+4849

Revision title: Cheshire Cat - Crop

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Revision title: Cheshire Cat - Crop

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