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The Dawn of Disk Formation in a Milky Way-sized Galaxy Halo: Thin Stellar Disks at z > 4

Tamfal, Tomas ; Mayer, Lucio ; Quinn, Thomas R. ; Babul, Arif ; Madau, Piero ; Capelo, Pedro R. ; Shen, Sijing ; Staub, Marius

The Astrophysical journal, 2022-04, Vol.928 (2), p.106 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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Título:
The Dawn of Disk Formation in a Milky Way-sized Galaxy Halo: Thin Stellar Disks at z > 4
Autor: Tamfal, Tomas ; Mayer, Lucio ; Quinn, Thomas R. ; Babul, Arif ; Madau, Piero ; Capelo, Pedro R. ; Shen, Sijing ; Staub, Marius
Assuntos: Accretion disks ; Astrophysics ; Disk galaxies ; Galactic rotation ; Galaxies ; Galaxy dynamics ; Galaxy evolution ; Galaxy kinematics ; Galaxy structure ; Hydrodynamical simulations ; Hydrodynamics ; James Webb Space Telescope ; Kinematics ; Milky Way ; N-body simulations ; Photometric observations ; Radio telescopes ; Red shift ; Rotating disks ; Simulation ; Smooth particle hydrodynamics ; Space telescopes ; Star & galaxy formation ; Star formation ; Star formation rate ; Stars & galaxies ; Stellar rotation ; Thermal diffusion
É parte de: The Astrophysical journal, 2022-04, Vol.928 (2), p.106
Notas: Galaxies and Cosmology
AAS32947
Descrição: Abstract We present results from GigaEris , a cosmological, N -body hydrodynamical “zoom-in” simulation of the formation of a Milky Way-sized galaxy halo with unprecedented resolution, encompassing of order a billion particles within the refined region. The simulation employs a modern implementation of smoothed-particle hydrodynamics, including metal-line cooling and metal and thermal diffusion. We focus on the early assembly of the galaxy, down to redshift z = 4.4. The simulated galaxy has properties consistent with extrapolations of the main sequence of star-forming galaxies to higher redshifts and levels off to a star formation rate of ∼60 M ⊙ yr −1 at z = 4.4. A compact, thin rotating stellar disk with properties analogous to those of low-redshift systems arises already at z ∼ 8. The galaxy rapidly develops a multi-component structure, and the disk, at least at these early stages, does not grow “upside-down” as often reported in the literature. Rather, at any given time, newly born stars contribute to sustain a thin disk. The kinematics reflect the early, ubiquitous presence of a thin disk, as a stellar disk component with v ϕ / σ R larger than unity is already present at z ∼ 9–10. Our results suggest that high-resolution spectro-photometric observations of very high-redshift galaxies should find thin rotating disks, consistent with the recent discovery of cold rotating gas disks by ALMA. Finally, we present synthetic images for the James Webb Space Telescope NIRCam camera, showing how the early disk would be easily detectable already at those early times.
Editor: Philadelphia: The American Astronomical Society
Idioma: Inglês;Norueguês

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The Dawn of Disk Formation in a Milky Way-sized Galaxy Halo: Thin Stellar Disks at z > 4

Tamfal, Tomas ; Mayer, Lucio ; Quinn, Thomas R. ; Babul, Arif ; Madau, Piero ; Capelo, Pedro R. ; Shen, Sijing ; Staub, Marius

Philadelphia: The American Astronomical Society

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