James Webb Space Telescope: Discoveries

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Super Member
NASA (December 9th, 2022)

An international team of astronomers has used data from NASA’s James Webb Space Telescope to report the discovery of the earliest galaxies confirmed to date. The light from these galaxies has taken more than 13.4 billion years to reach us, as these galaxies date back to less than 400 million years after the big bang, when the universe was only 2% of its current age.

Earlier data from Webb had provided candidates for such infant galaxies. Now, these targets have been confirmed by obtaining spectroscopic observations, revealing characteristic and distinctive patterns in the fingerprints of light coming from these incredibly faint galaxies."


The JWST Advanced Deep Extragalactic Survey (JADES)

STScI-2022-061a-m.jpg

IMAGE CREDIT: NASA, ESA, CSA, STScI, M. Zamani (ESA/Webb), and L. Hustak (STScI). SCIENCE: B. Robertson (UCSC), S. Tacchella (Cambridge), E. Curtis-Lake (Hertfordshire), S. Carniani (Scuola Normale Superiore), and the JADES Collaboration.


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inertia

Super Member
Top five discoveries so far:

- JWST can observe planets via the transit technique and

- JWST also detects light directly from exoplanets including evidence of water and carbon dioxide within atmospheres

- JWST has found many candidate galaxies that were formed within 400 million years of the big bang

- JWST has found an order of magnitude more early-universe galaxies with large masses and well-developed disks than expected

- two galaxies known as VV 191 look like they’re interacting, but one is more distant, meaning the light from the distant galaxy passes through the closer one.


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inertia

Super Member
"Evidence is emerging for a differential evolution of the galaxy population during the reionization epoch at z > 6. While the number densities of fainter galaxies continue to decline with redshift, the most UV-luminous sources seem to be in place rather early."

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Reference: Rohan P. Naidu, Pascal A. Oesch, Pieter van Dokkum, et al., " Two Remarkably Luminous Galaxy Candidates at z ~= 10-12 Revealed by JWST", The Astrophysical Journal Letters, Vol. 940., No. 1

- About redshift measurement (z)
 
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