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The seeds of supermassive black holes and the role of local radiation and metal spreading
U. Maio, S. Borgani, B. Ciardi +1
We present cosmological hydrodynamical simulations including atomic and molecular non-equilibrium chemistry, multi-frequency radiative transfer (0.7-100 eV sampled over 150 frequen…
Radiative transfer of ionizing radiation through gas and dust: stellar source case
Martin Glatzle, Benedetta Ciardi, Luca Graziani
We present a new dust extension to the Monte Carlo radiative transfer code crash, which enables it to simulate the propagation of ionizing radiation through mixtures of gas and dus…
The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z=20-25 from LOFAR
B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans +19
Observations of the redshifted 21-cm hyperfine line of neutral hydrogen from early phases of the Universe such as Cosmic Dawn and the Epoch of Reionization promise to open a new wi…
X-ray background and its correlation with the 21 cm signal
Q. Ma, B. Ciardi, M. B. Eide +1
We use high resolution hydrodynamical simulations to study the contribution to the X-ray background from high- energetic sources, such as X-ray binaries, accreting nuclear black…
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…
A case study of hurdle and generalized additive models in astronomy: the escape of ionizing radiation
M. W. Hattab, R. S. de Souza, B. Ciardi +3
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 ph…
Shock location and CME 3D reconstruction of a solar type II radio burst with LOFAR
P. Zucca, D. E. Morosan, A. P. Rouillard +62
Type II radio bursts are evidence of shocks in the solar atmosphere and inner heliosphere that emit radio waves ranging from sub-meter to kilometer lengths. These shocks may be ass…
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…