About the Object

Name: ZS7
Distance: z=7.15 (redshift)
Constellation: Sextans
Category: Galaxies


Position (RA):10 0 23.76
Position (Dec):2° 20' 36.97"
Field of view:3.00 x 3.00 arcminutes
Orientation:North is -0.0° left of vertical

Colours & filters

Optical 900 nmJames Webb Space Telescope
Infrared 1.15 μmJames Webb Space Telescope
Infrared 1.5 μmJames Webb Space Telescope
Infrared 2.0 μmJames Webb Space Telescope
Infrared 2.77 μmJames Webb Space Telescope
Infrared 3.56 μmJames Webb Space Telescope
Infrared 4.44 μmJames Webb Space Telescope

ZS7 environment (NIRcam image)

This image shows the environment of the galaxy system ZS7 from the JWST PRIMER programme (PI: J. Dunlop) as seen by Webb's NIRCam instrument.

New research using the NIRSpec instrument on the NASA/ESA/CSA James Webb Space Telescope has determined the system to be evidence of an ongoing merger of two galaxies and their massive black holes when the Universe was only 740 million years old. This marks the most distant detection of a black hole merger ever obtained and the first time that this phenomenon has been detected so early in the Universe. 

The team has found evidence for very dense gas with fast motions in the vicinity of the black hole, as well as hot and highly ionised gas illuminated by the energetic radiation typically produced by black holes in their accretion episodes. Webb also allowed the team to spatially separate the two black holes and determined that one of the two black holes has a mass that is 50 million times the mass of the Sun. The mass of the other black hole is likely similar, although it is harder to measure because this second black hole is buried in dense gas.

[Image description: This image features the ZS7 galaxy system, showing a large field of hundreds of galaxies on the black background of space.]


ESA/Webb, NASA, CSA, J. Dunlop, D. Magee, P. G. Pérez-González, H. Übler, R. Maiolino, et. al

About the Image

Id: weic2413a
Type: Observation
Release date: 16 May 2024, 10:00
Related releases: weic2413
Size: 6001 x 6001 px

Image Formats

Download IconLarge JPEG 7.8 MB
Download IconScreensize JPEG 279.5 KB



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