212 citations · 3.2k across the 77 of their papers we have counts for
12 papers · 1 filter
The role of Pop III stars and early black holes in the 21cm signal from Cosmic Dawn
Emanuele M. Ventura, Alessandro Trinca, Raffaella Schneider +3
Modeling the 21cm global signal from the Cosmic Dawn is challenging due to the many poorly constrained physical processes that come into play. We address this problem using the sem…
Large scale simulations of H and He reionization and heating driven by stars and more energetic sources
Marius B. Eide, Benedetta Ciardi, Luca Graziani +3
We present simulations of cosmic reionization and reheating from to , investigating the role of stars (emitting soft UV-photons), nuclear black holes (BHs, with power-l…
X-ray ionization of the intergalactic medium by quasars
Luca Graziani, B. Ciardi, M. Glatzle
We investigate the impact of quasars on the ionization of the surrounding intergalactic medium (IGM) with the radiative transfer code \texttt{CRASH4}, now accounting for X-rays and…
The Epoch of IGM heating by early sources of X-rays
Marius Berge Eide, Luca Graziani, Benedetta Ciardi +3
Observations of the 21 cm line from neutral hydrogen indicate that an Epoch of Heating (EoH) might have preceded the later Epoch of Reionization (EoR). Here we study the effects on…
Enabling Radiative Transfer on AMR grids in CRASH
N. Hariharan, L. Graziani, B. Ciardi +2
We introduce CRASH-AMR, a new version of the cosmological Radiative Transfer (RT) code CRASH, enabled to use refined grids. This new feature allows us to attain higher resolution i…
The Concerted Impact of Galaxies and QSOs on the Ionization and Thermal State of the Intergalactic Medium
Koki Kakiichi, Luca Graziani, Benedetta Ciardi +4
We present a detailed analysis of the ionization and thermal structure of the intergalactic medium (IGM) around a high-redshift QSO using a large suite of cosmological, multi-frequ…
Lyman-Alpha Emitting Galaxies as a Probe of Reionization: Large-Scale Bubble Morphology and Small-Scale Absorbers
Koki Kakiichi, Mark Dijkstra, Benedetta Ciardi +1
The visibility of LyA emitting galaxies during the Epoch of Reionization is controlled by both diffuse HI patches in large-scale bubble morphology and small-scale absorbers. To inv…
Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs
B. Ciardi, S. Inoue, F. B. Abdalla +26
We investigate the feasibility of detecting 21cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of c…
Clumping factors of HII, HeII and HeIII
Akila Jeeson-Daniel, Benedetta Ciardi, Luca Graziani
Estimating the intergalactic medium ionization level of a region needs proper treatment of the reionization process for a large representative volume of the universe. The clumping…
CRASH3: cosmological radiative transfer through metals
L. Graziani, A. Maselli, B. Ciardi
Here we introduce CRASH3, the latest release of the 3D radiative transfer code CRASH. In its current implementation CRASH3 integrates into the reference algorithm the code Cloudy t…
Prospects for detecting the 21cm forest from the diffuse intergalactic medium with LOFAR
B. Ciardi, P. Labropoulos, A. Maselli +20
We discuss the feasibility of the detection of the 21cm forest in the diffuse IGM with the radio telescope LOFAR. The optical depth to the 21cm line has been derived using simulati…
The effect of intergalactic helium on hydrogen reionisation: implications for the sources of ionising photons at z > 6
B. Ciardi, J. S. Bolton, A. Maselli +1
We investigate the effect of helium on hydrogen reionisation using a hydrodynamical simulation combined with the cosmological radiative transfer code CRASH. The simulations are run…