KIDS J232940-34092 explained

Epoch:	J2000
Dec:	^[1]
Constellation Name:	Pisces
KIDS J232940-34092
Type:	Post-Blue Nugget
Dist Ly:	5.2 billion light years

KIDS J232940-34092 is a massive quadruple lens compact post-blue nugget type galaxy that is located at Redshift 0.38, meaning it is located about 5.2 billion light years from Earth.^[2] It has a Einstein cross effect, a effect where light from a distant galaxy comes across a region of spacetime that is warped (gravitational lensed) by a massive galaxy in the lights path.^{[3] [4]} It was discovered along with KIDS J122456+005048, another blue nugget galaxy with a Einstein cross.^[4]

The galaxy has a evolved stellar population of very little stellar formation. This was discovered due to the galaxy's prominent absorption features.^[4]

Reference

1. [NLS2020] KIDS-EC1 system. 2024-11-02.
2. Kohler . Susanna . 2020-12-01 . Nugget Galaxies Cross in the Sky . AAS Nova Highlights . 7305. 2020nova.pres.7305K .
3. Web site: Hensley . Kerry . 2023-08-21 . Featured Image: A New Einstein Cross . 2023-10-29 . AAS Nova . en-US.
4. Napolitano . N. R. . Li . R. . Spiniello . C. . Tortora . C. . Sergeyev . A. . D’Ago . G. . Guo . X. . Xie . L. . Radovich . M. . Roy . N. . Koopmans . L. V. E. . Kuijken . K. . Bilicki . M. . Erben . T. . Getman . F. . 2020-12-03 . Discovery of Two Einstein Crosses from Massive Post-blue Nugget Galaxies at z > 1 in KiDS . The Astrophysical Journal . 904 . 2 . L31 . 10.3847/2041-8213/abc95b . 2041-8213. free . 2011.09150 . 2020ApJ...904L..31N .