The extreme astrophysical processes and conditions that characterize the early Universe are expected to result in young galaxies that are dynamically different from those observed today. This is because the strong effects associated with galaxy mergers and supernova explosions would lead to most young star-forming galaxies being dynamically hot, chaotic and strongly unstable. Here we report the presence of a dynamically cold, but highly star-forming, rotating disk in a galaxy at redshift z = 4.2, when the Universe was just 1.4 billion years old. Galaxy SPT-S J041839-4751.9 is strongly gravitationally lensed by a foreground galaxy at z = 0.263, and it is a typical dusty starburst, with global star-forming and dust properties that are in agreement with current numerical simulations and observations. Interferometric imaging at a spatial resolution of about 60 parsecs reveals a ratio of rotational to random motions of 9.7 ± 0.4, which is at least four times larger than that expected from any galaxy evolution model at this epoch but similar to the ratios of spiral galaxies in the local Universe. We derive a rotation curve with the typical shape of nearby massive spiral galaxies, which demonstrates that at least some young galaxies are dynamically akin to those observed in the local Universe, and only weakly affected by extreme physical processes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1038/s41586-020-2572-6 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
What Is the Clinical Value of Long Head of Biceps Tendon Tests in Distal Supraspinatus Tendon Rupture? A Prospective Multicenter Study.
J Shoulder Elbow Surg
January 2025
Université de Tours - Faculté de Médecine de Tours - CHRU Tours, Hôpital Trousseau, Service d'Orthopédie Traumatologie, Tours, France. Electronic address:
Purpose: The purpose of this study was to determine the clinical value of diagnostic tests for the long head of the biceps tendon (LHBT) injuries in the setting of a Patte stage 1 supraspinatus tendon rupture.
Methods: This was a prospective cohort multicenter study of 361 patients aged 30 to 80 years with Patte stage 1 distal supraspinatus tendon rupture. The LHBT was assessed clinically by palpation of the bicipital groove, the speed test, the Yergason test and the Kibler test.
Outcomes of mechanical thrombectomy for medium vessel occlusion in acute ischemic stroke patients with ASPECTS 4-5 vs. 6-7: a retrospective, multicenter, and multinational study.
Neuroradiology
January 2025
Neuroendovascular Program, Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
Introduction: Mechanical thrombectomy (MT) efficacy in medium vessel occlusion (MeVO) stroke, particularly in patients with low Alberta Stroke Program Early Computed Tomography Score (ASPECTS), remains less explored.
Methods: This retrospective study analyzed data from 443 AIS patients treated with MT for MeVO and low ASPECTS (4-7) at 37 centers across North America, Asia, and Europe, from September 2017 to July 2021. Patients were categorized into ASPECTS of 4-5 and 6-7.
Geo-spatial analysis of acute ischemic stroke reperfusion treatment in India: An assessment of distribution and access to centers.
Int J Stroke
January 2025
Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, India.
Background: Stroke is a leading cause of global mortality and disability, with a disproportionately high burden in low- and middle-income countries. Access to intravenous thrombolysis (IVT) and endovascular treatment (EVT) remains extremely limited.
Aims: We evaluated the spatial distribution and geographic accessibility of stroke centers in India.
Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering.
Phys Rev Lett
December 2024
Department of Astronomy, Cornell University, Ithaca, New York 14853, USA.
We present a new perturbative full-shape analysis of BOSS galaxy clustering data, including the full combination of the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with the gravitational lensing of cosmic microwave background measured from Planck. Assuming the ΛCDM model, we constrain the matter density fraction Ω_{m}=0.3138±0.
View Article and Find Full Text PDFA dormant overmassive black hole in the early Universe.
Nature
December 2024
NRC Herzberg, Victoria British Columbia, Canada.
Recent observations have found a large number of supermassive black holes already in place in the first few hundred million years after the Big Bang, many of which seem to be overmassive relative to their host galaxy stellar mass when compared with local relation. Several different models have been proposed to explain these findings, ranging from heavy seeds to light seeds experiencing bursts of high accretion rate. Yet, current datasets are unable to differentiate between these various scenarios.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!