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arxiv: 2210.15699 · v5 · pith:FQ3QLTPHnew · submitted 2022-10-27 · 🌌 astro-ph.GA

A Magnified Compact Galaxy at Redshift 9.51 with Strong Nebular Emission Lines

Hayley Williams , Patrick L. Kelly , Wenlei Chen , Gabriel Brammer , Adi Zitrin , Tommaso Treu , Claudia Scarlata , Anton M. Koekemoer
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Masamune Oguri Yu-Heng Lin Jose M. Diego Mario Nonino Jens Hjorth Danial Langeroodi Tom Broadhurst Noah Rogers Ismael Perez-Fournon Ryan J. Foley Saurabh Jha Alexei V. Filippenko Lou Strolger Justin Pierel Frederick Poidevin Lilan Yang
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classification 🌌 astro-ph.GA
keywords galaxygalaxiesredshiftcompactemissionjwstlightlines
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Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch because of the faintness of those galaxies and the redshift of their optical light into the infrared. We report the observation, in JWST imaging, of a distant galaxy that is magnified by gravitational lensing. JWST spectroscopy of the galaxy, at rest-frame optical wavelengths, detects strong nebular emission lines that are attributable to oxygen and hydrogen. The measured redshift is z = 9.51 +- 0.01, corresponding to 510 million years after the Big Bang. The galaxy has a radius of 16.2+4.6-7.2 parsecs, which is substantially more compact than galaxies with equivalent luminosity at z = 6 to 8, leading to a high star formation rate surface density.

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