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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742419.0, MPI für Astronomie / Publikationen_mpia
Rotating starburst cores in massive galaxies at z = 2.5
Authors:Tadaki, K.-i.; Kodama, T.; Nelson, E. J.; Belli, S.; Förster Schreiber, N. M.; Genzel, R.; Hayashi, M.; Herrera-Camus, R.; Koyama, Y.; Lang, P.; Lutz, D.; Shimakawa, R.; Tacconi, L. J.; Übler, H.; Wisnioski, E.; Wuyts, S.; Hatsukade, B.; Lippa, M.; Nakanishi, K.; Ikarashi, S.; Kohno, K.; Suzuki, T. L.; Tamura, Y.; Tanaka, I.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L25 (6 pp)
Audience:Not Specified
Abstract / Description:We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z = 2.5 on the star-forming main sequence. Both galaxies have compact dusty star-forming cores with effective radii of {R}{{e}}=1.3+/- 0.1 {kpc} and {R}{{e}}=1.2+/- 0.1 {kpc} in the 870 μm continuum emission. The spatial extent of star-forming molecular gas is also compact with {R}{{e}}=1.9+/- 0.4 {kpc} and {R}{{e}}=2.3+/- 0.4 {kpc}, but more extended than the dust emission. Interpreting the observed position-velocity diagrams with dynamical models, we find the starburst cores to be rotation dominated with the ratio of the maximum rotation velocity to the local velocity dispersion of {v}\max /{σ }0={7.0}-2.8+2.5 ({v}\max ={386}-32+36 km s-1) and {v}\max /{σ }0={4.1}-1.5+1.7 ({v}\max ={391}-41+54 km s-1). Given that the descendants of these massive galaxies in the local universe are likely ellipticals with v/σ nearly an order of magnitude lower, the rapidly rotating galaxies would lose significant net angular momentum in the intervening time. The comparisons among dynamical, stellar, gas, and dust mass suggest that the starburst
Free Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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