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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710100.0, MPI für Astronomie / Publikationen_mpia
A massive galaxy in its core formation phase three billion years after the Big Bang
Authors:Nelson, E.; van Dokkum, P.; Franx, M.; Brammer, G.; Momcheva, I.; Schreiber, N. F.; da Cunha, E.; Tacconi, L.; Bezanson, R.; Kirkpatrick, A.; Leja, J.; Rix, H.-W.; Skelton, R.; van der Wel, A.; Whitaker, K.; Wuyts, S.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Nature
Issue / Number:7518
Start Page:394
End Page:397
Audience:Not Specified
Abstract / Description:Most massive galaxies are thought to have formed their dense stellar cores in early cosmic epochs. Previous studies have found galaxies with high gas velocity dispersions or small apparent sizes, but so far no objects have been identified with both the stellar structure and the gas dynamics of a forming core. Here we report a candidate core in the process of formation 11 billion years ago, at redshift z = 2.3. This galaxy, GOODS-N-774, has a stellar mass of 100 billion solar masses, a half-light radius of 1.0 kiloparsecs and a star formation rate of solar masses per year. The star-forming gas has a velocity dispersion of 317 +/- 30 kilometres per second. This is similar to the stellar velocity dispersions of the putative descendants of GOODS-N-774, which are compact quiescent galaxies at z ~ 2 (refs 8, 9, 10, 11) and giant elliptical galaxies in the nearby Universe. Galaxies such as GOODS-N-774 seem to be rare; however, from the star formation rate and size of this galaxy we infer that many star-forming cores may be heavily obscured, and could be missed in optical and near-infrared surveys.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0028-0836 %R 10.1038/nature13616
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