AI Insight
The James Webb Space Telescope has identified two objects that were initially classified as early galaxies existing approximately 150 million years after the Big Bang. Upon further analysis, these objects were determined to be brown dwarfs located within our own Milky Way galaxy. Brown dwarfs are substellar objects with insufficient mass to sustain hydrogen fusion, and their spectral signatures can mimic the photometric appearance of high-redshift galaxies under certain observational conditions.
Why it matters
This discovery highlights a significant source of contamination in surveys of the early universe, underscoring the need for careful spectroscopic follow-up when identifying candidate high-redshift galaxies. Misclassifications of this kind could affect estimates of galaxy formation rates in the early universe if left undetected.
Two objects that appeared to be galaxies residing in a universe about 150 million years old turn out to be brown dwarfs in the Milky Way.
The post Webb Telescope Reveals Brown Dwarfs Masquerading as Early Galaxies appeared first on Sky & Telescope.
Source: Webb Telescope Reveals Brown Dwarfs Masquerading as Early Galaxies