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- Title
A candidate redshift z ≈ 10 galaxy and rapid changes in that population at an age of 500 Myr.
- Authors
Bouwens, R. J.; Illingworth, G. D.; Labbe, I.; Oesch, P. A.; Trenti, M.; Carollo, C. M.; van Dokkum, P. G.; Franx, M.; Stiavelli, M.; González, V.; Magee, D.; Bradley, L.
- Abstract
Searches for very-high-redshift galaxies over the past decade have yielded a large sample of more than 6,000 galaxies existing just 900-2,000 million years (Myr) after the Big Bang (redshifts 6 > z > 3; ref. 1). The Hubble Ultra Deep Field (HUDF09) data have yielded the first reliable detections of z ≈ 8 galaxies that, together with reports of a γ-ray burst at z ≈ 8.2 (refs 10, 11), constitute the earliest objects reliably reported to date. Observations of z ≈ 7-8 galaxies suggest substantial star formation at z > 9-10 (refs 12, 13). Here we use the full two-year HUDF09 data to conduct an ultra-deep search for z ≈ 10 galaxies in the heart of the reionization epoch, only 500 Myr after the Big Bang. Not only do we find one possible z ≈ 10 galaxy candidate, but we show that, regardless of source detections, the star formation rate density is much smaller (∼10%) at this time than it is just ∼200 Myr later at z ≈ 8. This demonstrates how rapid galaxy build-up was at z ≈ 10, as galaxies increased in both luminosity density and volume density from z ≈ 10 to z ≈ 8. The 100-200 Myr before z ≈ 10 is clearly a crucial phase in the assembly of the earliest galaxies.
- Subjects
REDSHIFT; BIG bang theory; HUBBLE deep field; STAR formation; STELLAR luminosity function; GALAXIES
- Publication
Nature, 2011, Vol 469, Issue 7331, p504
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature09717