BOSS1441 is an extremely massive

galaxy A galaxy is a Physical system, system of stars, stellar remnants, interstellar medium, interstellar gas, cosmic dust, dust, and dark matter bound together by gravity. The word is derived from the Ancient Greek, Greek ' (), literally 'milky', ...

overdensity located at a distance of z=2.32. It is known to be the largest large-scale structure and one of the most overdense structures at redshift z=~2. The overdensity contains a large overdensity of Lyman-Alpha emitting galaxies (LAEs) with 19 being confirmed, multiple galaxies with

active galactic nuclei An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such e ...

(AGB), and the object

MAMMOTH-1 MAMMOTH-1 is a large ultraluminous lyman Alpha emitting radio-quiet nebula A nebula (; or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular hydrogen and also cosmic dust. N ...

, a Lyman-alpha emitting nebula.

References

Galaxies {{galaxy-stub