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Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered. [2] The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. [3] The group is the most studied of all the compact galaxy groups. [2]
The orange arc is an elliptical galaxy at moderate redshift (z=0.7). The blue arcs are star-forming galaxies at intermediate redshift (z=1–2.5). There is a pair of images in the lower part of the picture of the newly discovered star-forming galaxy at about redshift 7. [4]
Name Equatorial Coordinates Declination Blue Magnitude Type Angular Diameter arc. Galaxy Diameter (Kly) Recessional Velocity Other Names NGC 4096: 12 06.0 +47 29: 11.5
The most powerful telescope to be launched into space has made history by detecting a record number of new stars in a distant galaxy. NASA's James Webb Space Telescope, history's largest and most ...
In 1986, a gravitationally lensed galaxy forming a blue arc was found lensed by galaxy cluster CL 2224-02 (C12224 in some references). However, its redshift was only determined in 1991, at z=2.237, by which time, it would no longer be the most distant galaxy known. [131] [132]
Abell 370 is a galaxy cluster located nearly 5 billion light-years away from the Earth (at redshift z = 0.375), in the constellation Cetus. [3] Its core is made up of several hundred galaxies. It was catalogued by George Abell , and is the most distant of the clusters he catalogued.
The location of Arp 273 (circled in blue) Arp 273 is a pair of interacting galaxies, 300 million light years away in the constellation Andromeda. It was first described in the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966. [5] The larger of the spiral galaxies, known as UGC 1810, is about five times more massive than the smaller ...
Luminous blue variable stars can undergo "giant outbursts" with dramatically increased mass loss and luminosity. η Carinae is the prototypical example, [19] with P Cygni showing one or more similar outbursts 300–400 years ago, [20] but dozens have now been catalogued in external galaxies.