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Lap1 B

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science1 month ago•89 min saved

JWST uncovers the universe’s most primitive galaxy, LAP1-B

The James Webb Space Telescope, aided by gravitational lensing from a foreground galaxy cluster, studied LAP1-B, a tiny galaxy formed about 800 million years after the Big Bang. Spectroscopy shows it has an exceptionally low oxygen abundance (about 1/240 of the Sun) and an elevated carbon-to-oxygen ratio, marking it as one of the most chemically primitive galaxies observed to date. The light was magnified roughly 100× by the MACS J0416 cluster, enabling insights into the early stages of galaxy formation and deeper connections to the Milky Way’s ancient fossil dwarf galaxies.

via Live Science|

#early-universe #james-webb-space-telescope #lap1-b

astronomy1 month ago•4 min saved

Webb Telescope Spots One of the Earliest Galaxies, Tracing the First Stars

Using the James Webb Space Telescope, astronomers captured LAP1-B, one of the universe’s earliest and faint galaxies, dating to about 13 billion years ago (roughly 800 million years after the Big Bang). Gravitational lensing by a foreground cluster amplified its light ~100x, enabling spectroscopy that reveals extremely low metal content and signatures of Population III stars, including a high carbon-to-oxygen ratio. The data also suggest the galaxy sits in a massive dark matter halo, offering critical clues about how the first galaxies formed and evolved in the early cosmos (Nature).

via The Daily Galaxy|

#astronomy #dark-matter #gravitational-lensing

science1 month ago•31 min saved

JWST Finds the Most Metal-Poor Galaxy Yet, a Fossil from Cosmic Dawn

James Webb Space Telescope spectroscopy of LAP1-B, a strongly lensed galaxy at zspec ≈ 6.63, reveals an ultra-faint, chemically primitive star-forming system with gas-phase oxygen abundance of ~4×10−3 Z☉—the lowest yet for a high-redshift galaxy. It hosts a hard ionizing radiation field inconsistent with enriched populations, shows an elevated C/O ratio suggesting metal-free/poor stellar origins, and has a stellar mass <3,300 M⊙ while its dynamical mass exceeds baryons, implying a dominant dark-matter halo. LAP1-B is a direct high-redshift progenitor of local ultra-faint dwarfs, providing a rare window into early galaxy formation.

via Nature|

#jwst #lap1-b #metallicity