File:COSMOS-Web field 2025 optical+IR+XR.jpg

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DescriptionCOSMOS-Web field 2025 optical+IR+XR.jpg	English: A 2025 COSMOS-Web field measuring 6.44 by 6.44 arcminutes in optical (Hubble), infrared (Webb) and X-ray (Newton+Chandra) light
Date	29 April 2025
Source	https://esawebb.org/images/potm2504b/ https://esawebb.org/copyright/
Author	ESA/Webb, NASA & CSA, G. Gozaliasl, A. Koekemoer, M. Franco, and the COSMOS-Web team

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:45, 11 May 2025		4,000 × 4,000 (3.93 MB)	Dabed	Uploaded a work by ESA/Webb, NASA & CSA, G. Gozaliasl, A. Koekemoer, M. Franco, and the COSMOS-Web team from https://esawebb.org/images/potm2504b/ https://esawebb.org/copyright/ with UploadWizard

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Cosmic Evolution Survey

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Source	ESA/Webb
Credit/Provider	ESA/Webb, NASA & CSA, G. Gozaliasl, A. Koekemoer, M. Franco, and the COSMOS-Web team
Usage terms	Creative Commons Attribution 4.0 International License
Short title	A visual feast of galaxies, from infrared to X-ray
Image title	This new Picture of the Month from the NASA/ESA/CSA James Webb Space Telescope features an astounding number of galaxies. The objects in this frame span an incredible range of distances, from stars within our own Milky Way, marked by diffraction spikes, to galaxies billions of light-years away. The star of this image is a group of galaxies, the largest concentration of which can be found just below the centre of this image. These galaxies glow with white-gold light. We see this galaxy group as it appeared when the Universe was 6.5 billion years old, a little less than half the Universe’s current age. More than half of the galaxies in our Universe belong to galaxy groups like the one pictured here. Studying galaxy groups is critical for understanding how individual galaxies link up to form galaxy clusters, the largest gravitationally bound structures in the Universe. Belonging to agalaxy group can also alter the course of a galaxy’s evolution through mergers and gravitational interactions. The galaxy group pictured here is the most massive group in what’s called the COSMOS-Web field. COSMOS stands for Cosmic Evolution Survey. This survey has enlisted several telescopes,including Webb, the NASA/ESA Hubble Space Telescope, and ESA’s XMM-Newton space observatory to gaze deeply at a single patch of sky. COSMOS-Web aims to understand how massive structures like galaxy clusters came to be. Webb’s infrared capabilities and sensitive instruments have pushed the search for galaxy groups farther back into cosmic history, revealing galaxy groups as far back as when the Universe was only 1.9 billion years old — just 14% of its current age. This image combines infrared data from Webb’s Near-InfraRed Camera (NIRCam) instrument with further infrared observationsfrom the Hubble Space Telescope. The X-ray data, shown in purple, highlights the presence of hot gas concentrated within the X-ray galaxy group. These X-ray data come from ESA’s XMM-Newton space observatory, with contributions from NASA’s Chandra X-ray Observatory. This image presents a visual feast of galaxies. Take a moment to zoom in and examine the galactic buffet: you’ll see galaxies with delicate spiral arms or warped disks, galaxies with smooth, featureless faces, and even galaxies that are interacting or merging and have taken on an array of strange shapes. The range of colours is also fascinating, representing both galaxies with different ages of stars — younger stars appear bluer, and older stars appear redder — as well as galaxies at different distances. The more distant a galaxy, the redder it appears. COSMOS-Web is a 255-hour Webb Treasury programme that maps 0.54square degrees (a little more than two-and-a-half times the area covered by three full moons) of the COSMOS field using four NIRCam filters. Treasury programmes have the potential to answer multiple important questions about our Universe. COSMOS-Web has three key goals: to identify galaxies during the epoch of reionization, when the first stars and galaxies reionized the Universe’s hydrogen gas; to probe the formation of the Universe’s most massive galaxies; and to understand how the relationship between the mass of a galaxy’s stars and the mass of its extended galactic halo evolves overthe course of cosmic history. [Image Description: An area of deep space with thousands of galaxies in various shapes and sizes on a black background. A few gold-coloured galaxies are bunched closely together in the centre. A large, translucent purple cloud lies over the galaxies, thickest across the centre where the gold galaxies sit, and fainter up to the right. This shows where X-rays are emitted by hot gas in the group of galaxies.] Links Webb (MIRI) and Hubble image Slider tool (with/without X-ray)
Date and time of data generation	10:00, 29 April 2025
Contact information	https://esawebb.org ESA Office, Space Telescope Science Institute, 3700 San Martin Dr Baltimore, MD, 21218 United States
IIM version	4

File:COSMOS-Web field 2025 optical+IR+XR.jpg

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