Old galaxies in the young Universe
Top Cited Papers
- 1 July 2004
- journal article
- letter
- Published by Springer Nature in Nature
- Vol. 430 (6996) , 184-187
- https://doi.org/10.1038/nature02668
Abstract
More than half of all stars in the local Universe are found in massive spheroidal galaxies1, which are characterized by old stellar populations2,3 with little or no current star formation. In present models, such galaxies appear rather late in the history of the Universe as the culmination of a hierarchical merging process, in which larger galaxies are assembled through mergers of smaller precursor galaxies. But observations have not yet established how, or even when, the massive spheroidals formed2,3, nor if their seemingly sudden appearance when the Universe was about half its present age (at redshift z ≈ 1) results from a real evolutionary effect (such as a peak of mergers) or from the observational difficulty of identifying them at earlier epochs. Here we report the spectroscopic and morphological identification of four old, fully assembled, massive (1011 solar masses) spheroidal galaxies at l.6 < z < 1.9, the most distant such objects currently known. The existence of such systems when the Universe was only about one-quarter of its present age shows that the build-up of massive early-type galaxies was much faster in the early Universe than has been expected from theoretical simulations4.Keywords
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This publication has 26 references indexed in Scilit:
- The Redshift Distribution of Near-Infrared-selected Galaxies in the Great Observatories Origins Deep Survey as a Test of Galaxy Formation ScenariosThe Astrophysical Journal, 2004
- Colloquium: Measuring and understanding the universeReviews of Modern Physics, 2003
- LYMANα EMITTERS BEYOND REDSHIFT 5: THE DAWN OF GALAXY FORMATIONJournal of The Korean Astronomical Society, 2003
- The DEEP Groth Strip Survey. X. Number Density and Luminosity Function of Field E/S0 Galaxies atz< 1The Astrophysical Journal, 2002
- The K20 surveyAstronomy & Astrophysics, 2002
- DeepHubble Space Telescopeimaging surveys and the formation of spheroidal galaxiesMonthly Notices of the Royal Astronomical Society, 2001
- Detection of Evolved High-Redshift Galaxies in Deep NICMOS/VLT ImpagesThe Astrophysical Journal, 1999
- The Cosmic Baryon BudgetThe Astrophysical Journal, 1998
- Formation of elliptical galaxies at moderate redshiftsNature, 1997
- A 3.5-Gyr-old galaxy at redshift 1.55Nature, 1996