first galaxies
(targeted highest red-shift galaxies showing little or no metal)
First galaxies are targets of some searches, e.g., Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS),
typically searching in near infrared.
The goal is to find ancient galaxies with ever higher redshifts,
and with little or no metal. Candidates are in the z=7-to-12 range.
Deep photometric survey images are scanned,
e.g., for dropouts in the images taken through the
shorter-wavelength filters.
JWST is basically tailored to finding and studying such galaxies and
immediately made contributions once it was in operation.
To some degree, observation has overtaken theory as galaxy formation
theories don't create galaxies as soon after the Big Bang as
observation reveals.
(galaxy type)
Further reading:
http://candels-collaboration.blogspot.com/2013/09/in-search-of-first-galaxies.html
https://www.nasa.gov/feature/goddard/2021/back-to-the-beginning-probing-the-first-galaxies-with-webb
https://esahubble.org/images/ann0602/
https://ui.adsabs.harvard.edu/abs/2011ARA%26A..49..373B/abstract
http://firstgalaxies.org/explore.html
https://arxiv.org/abs/2306.02468
| Redshift | Parsecs
/Distance | Lightyears
/Lookback Years | | |
| 7 | 4.15Gpc | 13.55Gly | nearest | first galaxies |
| 12 | 4.24Gpc | 13.81Gly | furthest | first galaxies |
|
Referenced by pages:
pea galaxy (GP)
protogalaxy
Index