A tale of two sites - I. Inferring the properties of minihalo-hosted galaxies from current observations
Yuxiang Qin, Andrei Mesinger, Jaehong Park, Bradley Greig, Julian B Munoz
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2020
The very first galaxies that started the cosmic dawn likely resided in so-called ‘minihaloes’, with masses of ∼105–108 M☉, accreting their gas from the intergalactic medium through H2 cooling. Such molecularly cooled galaxies (MCGs) mostly formed in pristine environments, hosted massive, metal-free stars, and were eventually sterilized by the build-up of a disassociating (Lyman–Werner; LW) background. Therefore, their properties might be very different from the galaxies we see in the later Universe. Although MCGs are probably too faint to be observed directly, we could nevertheless infer their properties from the imprint they leave in the cosmic 21-cm signal. Here we quantify this imprint by..View full abstract
Awarded by European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (AIDA)
Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Awarded by National Science Foundation (NSF)
The authors thank Zoltan Haiman and the anonymous referee for their comprehensive review and positive comments. This work was supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (AIDA - #638809). Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project #CE170100013 as well as the National Science Foundation (NSF) grant AST-1813694.