Bibcode
Hattab, M. W.; de Souza, R. S.; Ciardi, B.; Paardekooper, J.-P.; Khochfar, S.; Dalla Vecchia, C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, p.3307-3321
Fecha de publicación:
3
2019
Número de citas
6
Número de citas referidas
6
Descripción
The dark ages of the Universe end with the formation of the first
generation of stars residing in primeval galaxies. These objects were
the first to produce ultraviolet ionizing photons in a period when the
cosmic gas changed from a neutral state to an ionized one, known as
Epoch of Reionization (EoR). A pivotal aspect to comprehend the EoR is
to probe the intertwined relationship between the fraction of ionizing
photons capable to escape dark haloes, also known as the escape fraction
(fesc), and the physical properties of the galaxy. This work
develops a sound statistical model suitable to account for such
non-linear relationships and the non-Gaussian nature of fesc.
This model simultaneously estimates the probability that a given
primordial galaxy starts the ionizing photon production and estimates
the mean level of the fesc once it is triggered. The model
was employed in the First Billion Years simulation suite, from which we
show that the baryonic fraction and the rate of ionizing photons appear
to have a larger impact on fesc than previously thought. A
naive univariate analysis of the same problem would suggest smaller
effects for these properties and a much larger impact for the specific
star formation rate, which is lessened after accounting for other galaxy
properties and non-linearities in the statistical model. A snippet code
to reproduce the analysis of this paper is available at COIN toolbox
Proyectos relacionados
Astrofísica Numérica: Formación y Evolución de Galaxias
Entre las cuestiones fundamentales en Astronomía y Astrofísica están la formación y evolución de galaxias. Las escalas de tiempo y tamaño son tan astronómicas que su observación en galaxias individuales es imposible. Solo con el uso de simulaciones numéricas es posible entender la formación de estructuras cósmicas dentro del actual marco
Claudio
Dalla Vecchia