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ALMA Band 3 Selection of Ultra-high Redshift Dropouts: The final challenge to {Λ}CDM

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arxiv 2503.24312 v1 pith:V3ELVB7X submitted 2025-03-31 astro-ph.GA

ALMA Band 3 Selection of Ultra-high Redshift Dropouts: The final challenge to {Λ}CDM

C. Lovell , M. Lee , A. Vijayan , T. Harvey , L. Sommovigo , A. Long , E. Lambrides , W. Roper
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S. Wilkins D. Narayanan N. Adams D. Austin M. Maltz
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keywords almacandidateredshifttechniquebanddatadropoutsgalaxy
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The Lyman-break technique has been used to successfully identify high-redshift candidates in broad-band photometric data in the rest-frame optical and NIR using the dropout technique. We pioneer the application of this technique to new wavelength regimes, and search for dropouts in combined ALMA and JWST data. We find a candidate that is undetected in NIRCam imaging including and blueward of the F444W filter, but clearly identified in ALMA band 3. Assuming this is a Lyman-break candidate, we measure a redshift in the range $40 < z < 21\,380$. This is the highest redshift galaxy candidate discovered to date, and is in significant tension with current and future predictions from cosmological simulations, with implications for galaxy evolution in the (very) early Universe.

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Cited by 1 Pith paper

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  1. Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn

    physics.gen-ph 2025-10 reject novelty 4.0

    Under the author's CCC+TL cosmology, galaxy effective radii are larger by roughly (1+z)^0.93, reducing the inferred density and mass of early galaxies.