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DC Field | Value | Language |
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dc.citation.endPage | + | - |
dc.citation.number | 7645 | - |
dc.citation.startPage | 397 | - |
dc.citation.title | NATURE | - |
dc.citation.volume | 543 | - |
dc.contributor.author | Genzel, R. | - |
dc.contributor.author | Schreiber, N. M. Forster | - |
dc.contributor.author | Ubler, H. | - |
dc.contributor.author | Lang, P. | - |
dc.contributor.author | Naab, T. | - |
dc.contributor.author | Bender, R. | - |
dc.contributor.author | Tacconi, L. J. | - |
dc.contributor.author | Wisnioski, E. | - |
dc.contributor.author | Wuyts, S. | - |
dc.contributor.author | Alexander, T. | - |
dc.contributor.author | Beifiori, A. | - |
dc.contributor.author | Belli, S. | - |
dc.contributor.author | Brammer, G. | - |
dc.contributor.author | Burkert, A. | - |
dc.contributor.author | Carollo, C. M. | - |
dc.contributor.author | Chan, J. | - |
dc.contributor.author | Davies, R. | - |
dc.contributor.author | Fossati, M. | - |
dc.contributor.author | Galametz, A. | - |
dc.contributor.author | Genel, S. | - |
dc.contributor.author | Gerhard, O. | - |
dc.contributor.author | Lutz, D. | - |
dc.contributor.author | Mendel, J. T. | - |
dc.contributor.author | Momcheva, I. | - |
dc.contributor.author | Nelson, E. J. | - |
dc.contributor.author | Renzini, A. | - |
dc.contributor.author | Saglia, R. | - |
dc.contributor.author | Sternberg, A. | - |
dc.contributor.author | Tacchella, Sandro | - |
dc.contributor.author | Tadaki, K. | - |
dc.contributor.author | Wilman, D. | - |
dc.date.accessioned | 2023-12-21T22:37:03Z | - |
dc.date.available | 2023-12-21T22:37:03Z | - |
dc.date.created | 2021-07-19 | - |
dc.date.issued | 2017-03 | - |
dc.description.abstract | In the cold dark matter cosmology, the baryonic components of galaxies-stars and gas-are thought to be mixed with and embedded in non-baryonic and non-relativistic dark matter, which dominates the total mass of the galaxy and its dark-matter halo(1). In the local (low-redshift) Universe, the mass of dark matter within a galactic disk increases with disk radius, becoming appreciable and then dominant in the outer, baryonic regions of the disks of star-forming galaxies. This results in rotation velocities of the visible matter within the disk that are constant or increasing with disk radius-a hallmark of the dark-matter model(2). Comparisons between the dynamical mass, inferred from these velocities in rotational equilibrium, and the sum of the stellar and cold-gas mass at the peak epoch of galaxy formation ten billion years ago, inferred from ancillary data, suggest high baryon fractions in the inner, star-forming regions of the disks(3-6). Although this implied baryon fraction may be larger than in the local Universe, the systematic uncertainties (owing to the chosen stellar initial-mass function and the calibration of gas masses) render such comparisons inconclusive in terms of the mass of dark matter(7). Here we report rotation curves (showing rotation velocity as a function of disk radius) for the outer disks of six massive star-forming galaxies, and find that the rotation velocities are not constant, but decrease with radius. We propose that this trend arises because of a combination of two main factors: first, a large fraction of the massive high-redshift galaxy population was strongly baryon-dominated, with dark matter playing a smaller part than in the local Universe; and second, the large velocity dispersion in high-redshift disks introduces a substantial pressure term that leads to a decrease in rotation velocity with increasing radius. The effect of both factors appears to increase with redshift. Qualitatively, the observations suggest that baryons in the early (high-redshift) Universe efficiently condensed at the centres of dark-matter haloes when gas fractions were high and dark matter was less concentrated. | - |
dc.identifier.bibliographicCitation | NATURE, v.543, no.7645, pp.397 - + | - |
dc.identifier.doi | 10.1038/nature21685 | - |
dc.identifier.issn | 0028-0836 | - |
dc.identifier.scopusid | 2-s2.0-85015629366 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53269 | - |
dc.identifier.wosid | 000396337400045 | - |
dc.language | 영어 | - |
dc.publisher | NATURE PUBLISHING GROUP | - |
dc.title | Strongly baryon-dominated disk galaxies at the peak of galaxy formation ten billion years ago | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Multidisciplinary Sciences | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | STAR-FORMING GALAXIES | - |
dc.subject.keywordPlus | SIMILAR-TO 2 | - |
dc.subject.keywordPlus | SINS/ZC-SINF SURVEY | - |
dc.subject.keywordPlus | MASS-METALLICITY RELATION | - |
dc.subject.keywordPlus | DARK-MATTER HALOES | - |
dc.subject.keywordPlus | ROTATION CURVES | - |
dc.subject.keywordPlus | SCALING RELATIONS | - |
dc.subject.keywordPlus | ANGULAR-MOMENTUM | - |
dc.subject.keywordPlus | MAIN-SEQUENCE | - |
dc.subject.keywordPlus | KINEMATICS EVIDENCE | - |
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