 |
| El Gourdo image credit NASA, ESA and CSA |
" We occasionally come across interesting images which are so fabulous that we repost them. This JWST image of a massive group of galaxies in the Constellation Phoenix is visible in the southern hemisphere. Neither Kurt or myself had heard of this group so this was a first for us" - Joel Cairo CEO of the Jodrell Plank Observatory.
Observations relating to the above JWST image made by Gary Gemini the JPO's Coms Officer:
JWST View of El Gordo
"This image captured by the James Webb Space Telescope (JWST) shows El Gordo (officially named ACT-CL J0102-4915 or SPT-CL J0102-4915), one of the most massive and extreme galaxy clusters in the cosmic universe.
Location & Constellation
Constellation: Phoenix (a constellation in the southern sky).
Distance: Located approximately 7.3 to 7.6 billion light-years away from Earth. The light captured in this NIRCam (Near-Infrared Camera) image left the cluster when the universe was only about half its current age (around 6.2 billion years after the Big Bang).
Key Features & Fascinating Details
"El Gordo" Means "The Fat One":
The cluster was given the nickname "El Gordo" (Spanish for "The Fat One") by astronomers due to its immense size and mass. It contains hundreds of individual galaxies and is estimated to have a mass equivalent to 3 quadrillion (3×1015) suns. It is the most massive galaxy cluster known to exist in that cosmic era.
Gravitational Lensing (Nature's intoCosmic Telescope):
Because El Gordo is so colossal, its gravity bends and warps the fabric of spacetime around it. This creates a gravitational lens that magnifies, distorts, and stretches the light from even more distant galaxies lying far behind it into long streaks and arcs.
Prominent Arcs in the Image:
The Fishhook (El Anzuelo): The bright reddish/orange curved swoosh seen toward the upper center/left is a background red giant galaxy whose light has been severely lensed into an arc. JWST's instruments revealed that its red hue is caused by vast amounts of cosmic dust.
The Thin One (La Flaca): Near the middle-left of the cluster is a razor-thin, pencil-like streak created by another background galaxy distorted by the cluster's mass.
A Collision in Progress:
El Gordo is not just a static cluster; it is actually two giant galaxy clusters colliding and merging together at high speeds, spewing superheated gas into intergalactic space.
JWST Diffraction Spikes:
The sharp, eight-pointed bright stars in the foreground are stars within our own Milky Way galaxy. Their distinctive starburst pattern is a signature artifact produced by JWST's hexagonal mirror alignment".
No comments:
Post a Comment