Bulk Flows and End of the Dark Ages with the SKA
Umberto Maio, Benedetta Ciardi, Leon V. E. Koopmans

TL;DR
This paper explores how primordial bulk flows in the early Universe affected star formation, metal spreading, and re-ionization, and discusses how the upcoming SKA telescope can detect these effects through HI and molecular line observations.
Contribution
It provides analytical and simulation-based insights into the impact of primordial bulk flows on early baryon evolution and highlights SKA's potential to observe these effects.
Findings
Bulk flows can delay star formation and metal spreading.
They cause patchier and noisier HI signals during re-ionization.
SKA will probe effects at high redshifts (z ~ 6-40).
Abstract
The early Universe is a precious probe of the birth of primordial objects, first star formation events and consequent production of photons and heavy elements. Higher-order corrections to the cosmological linear perturbation theory predicts the formation of coherent supersonic gaseous streaming motions at decoupling time. These bulk flows impact the gas cooling process and determine a cascade effect on the whole baryon evolution. By analytical estimates and N-body hydrodynamical chemistry numerical simulations including atomic and molecular evolution, gas cooling, star formation, feedback effects and metal spreading for individual species from different stellar populations according to the proper yields and lifetimes, we discuss the role of these primordial bulk flows at the end of the dark ages and their detectable impacts during the first Gyr in view of the upcoming SKA mission. Early…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Radio Astronomy Observations and Technology · Astrophysics and Star Formation Studies
