A Highly Magnified and Extremely Compact Galaxy at Redshift 9.51 with Strong Nebular Emission

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Hayley Williams Patrick L. Kelly Wenlei Chen Gabriel Brammer Adi Zitrin Tommaso Treu Claudia Scarlata Anton M. Koekemoer 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

摘要： Given their extremely faint apparent brightness, the nature of the first galaxies and how they reionized the Universe's gas are not yet understood. Here we report the discovery, in JWST imaging, of a highly magnified, low mass (log(Mstellar/Msun) = 7.63+0.22-0.24) galaxy visible when the Universe was only 510 Myr old, and follow-up JWST spectroscopy from Lyman alpha to [O III] 5007 A in its rest frame. We detect the [O III] 5007 A and H Beta emission lines with a respective signal-to-noies ratio of 40 and 7, and five additional lines with signal-to-noise greater than 3. The galaxy's magnification of approximately 20 allows us to measure a radius of 16.4+10.7-7.0 pc, which is a factor of 9.3+10.5-4.4 (3.5 sigma) smaller than galaxies with comparable luminosity at z = 6 - 8.

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