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Investigating Early Populations of Galaxies with the Best Telescopes in the Universe

5 Feb 2020, 16:00 UTC
Investigating Early Populations of Galaxies with the  Best Telescopes in the Universe
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Title: Early Low-Mass Galaxies and Star-Cluster Candidates at z ~ 6-9 Identified by the Gravitational Lensing Technique and Deep Optical/Near-Infrared ImagingAuthors: Shotaro Kikuchihara, Masami Ouchi, Yoshiaki Ono, Ken Mawatari et al.First Author’s Institution: Institute for Cosmic Ray Research, The University of TokyoStatus: Submitted to ApJIn the coming years, we will see the launch of one of the most powerful space-based telescopes ever built, the James Webb Space Telescope (JWST), and we will see a new class of colossal ground-based observatories built with primary mirrors exceeding 30 meters in diameter. However, despite all of our technical ingenuity, the most powerful telescopes in the universe are in fact galaxy clusters. As the most massive gravitationally bound structures, galaxy clusters severely distort their local spacetimes and can magnify substantial areas of the sky through the phenomenon of gravitational lensing. Cluster lenses allow astronomers to observe many distant sources in unprecedented detail that would otherwise be too faint to study (e.g., Fig. 1). Indeed, the possibility of discovering and characterizing some of the earliest and most distant galaxies observable was a primary motivation for conducting a deep survey of six galaxy clusters known to be powerful lenses. This project, dubbed The Hubble Frontier Fields, ...

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