Using spectroscopic observations from the James Webb Space Telescope (JWST), an international team of astronomers managed to detect four of the oldest and most distant galaxies confirmed to date🇧🇷 This means capturing the light emitted by star systems more than 13.4 billion years ago, i.e. 400 million years before the “anniversary” of the Big Bang.
As with previous observations with the Hubble Telescope, these first JWST surveys have captured several candidate galaxies at unimaginable distances. Now, four of these targets have been “confirmed” by extensive spectroscopic observations; how to describe some of its physical properties🇧🇷
These primordial star-forming galaxies probably reionized intergalactic hydrogen during the first billion years of cosmic history, but both the duration and start date of this process are unknown. This childhood view of the universe is made available By the Advanced Deep Extragalactic Search (JADES) program.
How do astronomers measure the distance of a galaxy?
The distance from Earth to a particular galaxy can be inferred by observing its redshift. As the universe is constantly expanding, distant objects seem to move away from us. Like this, light is amplified to longer, red wavelengths by the Doppler effect, Even if the source of the waves and the observer move, the propagation of the waves remains constant.
Working with JWST’s infrared camera – NIRCam – JADES spectroscopy analyzed a region called the Hubble Ultra Deep Field, which has been studied for more than 20 years, by observing it at nine different infrared wavelengths. The search brought up excellent images of nearly 100,000 distant galaxies.
Finally, the researchers used the NIRSpec spectrograph. To collect light from 250 faint galaxies🇧🇷 The result was precise measurements of the redshift and properties of the gas and stars found in these galaxies. “We can now really begin to unravel how galaxies came together over time,” said Brant Robertson, the paper’s first author.
ARTICLE 🇧🇷 ArXiv – DOI: 10.48550/arXiv.2212.04480 (material not peer reviewed).
Source: Tec Mundo
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