Hubble Legacy Field^[1]

Comparison of how far in the past some of theHubble Space Telescope's deep fields have seen in terms of redshift and million years and also how far theJames Webb Space Telescope should be able to see.

Inastronomy, adeep field is an image of a portion of the sky taken with a very long exposure time, in order to detect and study faint objects. The depth of the field refers to theapparent magnitude or theflux of the faintest objects that can be detected in the image.^[2] Deep field observations usually cover a smallangular area on the sky, because of the large amounts of telescope time required to reach faint flux limits. Deep fields are used primarily to studygalaxy evolution and the cosmic evolution ofactive galactic nuclei, and to detect faint objects at highredshift. Numerous ground-based and space-based observatories have taken deep-field observations at wavelengths spanningradio toX-rays.

The first deep-field image to receive a great deal of public attention was theHubble Deep Field, observed in 1995 with theWFPC2 camera on theHubble Space Telescope. Other space telescopes that have obtained deep-field observations include theChandra X-ray Observatory, theXMM-Newton Observatory, theSpitzer Space Telescope, and theJames Webb Space Telescope.

Left: image taken byHubble (2017) vs Right: the image taken byWebb (2022)^[3]

Deep Field –Galaxy clusterSMACS J0723.3-7327^{[4][5][2][6][7][8]}

The following table gives a partial list of deep-field observations taken since 1995.

Image	Name	Telescope	Year captured	Size (arcminute)	Number of exposures
	Hubble Deep Field	Hubble Space Telescope	1995	2.6′x2.6′	342
	Hubble Deep Field South	Hubble Space Telescope	1998	5.3²′	995
	Chandra Deep Field South	Chandra X-ray Observatory	1999–2000	16′ across	11
	Hubble Ultra-Deep Field	Hubble Space Telescope	2003–2004	2.4′x2.4′	808
	Extended Groth Strip	Hubble Space Telescope	2004–2005	70′x10′	over 500
	Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)	Hubble Space Telescope	2011
	ESO'sVLT and theSINFONI instrument[9]	Very Large Telescope	2012
	Hubble eXtreme Deep Field	Hubble Space Telescope	2012	2.3′x3′
	Hubble Ultra-Deep Field (UV/VIS/NIR)	Hubble Space Telescope	2014
	Hubble Frontier Fields MACS J0416.1-2403[10]	Hubble Space Telescope	2015
	Hubble Frontier Fields Abell 2744[11]	Hubble Space Telescope	2015
	Hubble Frontier Fields MACS J0717.5+3745	Hubble Space Telescope	2015
	Hubble Frontier Fields MACS J1149.5+2223[12]	Hubble Space Telescope	2015
	Hubble Frontier FieldsAbell S1063[13]	Hubble Space Telescope	2016
	Hubble Frontier Fields Abell 370[14]	Hubble Space Telescope	2017
	Hubble Frontier Fields Abell 370 parallel field[15]	Hubble Space Telescope	2017
	Hubble Deep UV (HDUV) Legacy Survey[16]	Hubble Space Telescope	2018
	Hubble Legacy Field[1]	Hubble Space Telescope	2019	25′x25′	7,500
	Dark Energy Survey[17][18]	Víctor M. Blanco Telescope	2021	18.41′x9.64′
	Webb's First Deep Field	James Webb Space Telescope	2022	2.4′ across
	James Webb Space Telescope – JADES (James Webb Space Telescope Advanced Deep Extragalactic Survey) First Deep Field[19][20]	James Webb Space Telescope	2022	4-6′×12′ approx; (4′×6′ and 6′×6′ subsets adjacent)[21]
	James Webb Space Telescope – JADES (James Webb Space Telescope Advanced Deep Extragalactic Survey)[22]	James Webb Space Telescope	2024	??′ across
	Euclid Deep Field North (EDF-N)[23]	Euclid	2025-(data release 3)	20 deg2	DR3 visits: 40
	Euclid Deep Field South (EDF-S)[23]	Euclid	2025-(data release 3)	23 deg2	DR3 visits: 45
	Euclid Deep Field Fornax (EDF-F), centred on Chandra Deep Field South[23]	Euclid	2025-(data release 3)	10 deg2	DR3 visits: 52

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• List of Hubble Space Telescope anniversary images

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