Results 41 to 50 of about 8,595 (212)

The Epoch of Reionization in Warm Dark Matter Scenarios

Universe, 2021
In this paper we investigate how the Reionization process is affected by early galaxy formation in different cosmological scenarios. We use a semi-analytic model with suppressed initial power spectra to obtain the UV Luminosity Function in thermal Warm ...
Massimiliano Romanello, Nicola Menci, Marco Castellano   +2 more
doaj   +1 more source

The galaxies that reionized the Universe

, 2010
14 pages, 13 figures, paper accepted for publication in ...
Raičević, Milan, Theuns, Tom, Lacey, Cedric   +2 more
openaire   +5 more sources

Large‐Scale Simulations of Reionization [PDF]

The Astrophysical Journal, 2007
25 ...
Kohler, Katharina, Gnedin, Nickolay Y., Hamilton, Andrew J. S.   +2 more
openaire   +2 more sources

Lyα visibility from z = 4.5 to 11 in the UDS field: Evidence for a high neutral hydrogen fraction and small ionized bubbles at z ∼ 7

Astronomy & Astrophysics
The resonant scattering nature of Lyα photons interacting with neutral hydrogen makes Lyα emitters (LAEs) robust tracers of the intergalactic neutral hydrogen fraction, and thus sensitive probes of cosmic reionization.
Napolitano L., Pentericci L., Dickinson M., Arrabal Haro P., Taylor A. J., Calabrò A., Bhagwat A., Santini P., Arevalo-Gonzalez F., Begley R., Castellano M., Ciardi B., Donnan C. T., Dottorini D., Dunlop J. S., Finkelstein S. L., Fontana A., Giavalisco M., Hirschmann M., Jung I., Koekemoer A. M., Kokorev V., Llerena M., Lucas R. A., Mascia S., Merlin E., Pérez-González P. G., Stanton T. M., Tripodi R., Wang X., Weiner B. J.   +30 more
doaj   +1 more source

Patchy Reionization Delays Quenching in Isolated Ultrafaint Dwarf Galaxies

The Astrophysical Journal
The spatially inhomogeneous nature of cosmic reionization is directly encoded in the quenching timescales of ultrafaint dwarf galaxies (UFDs). While most cosmological simulations employ a spatially uniform UV background (UVB) for computational efficiency,
Juyoung Kim, Myoungwon Jeon, Yumi Choi, Sangmo Tony Sohn   +3 more
doaj   +1 more source

Detecting the signature of helium reionization through 3HeII 3.46 cm line-intensity mapping

Astronomy & Astrophysics
Context. Helium reionization is the most recent phase change of the intergalactic medium, yet its timing and main drivers remain uncertain. Among the probes to trace to trace how it unfolds, the 3.46 cm hyperfine line of singly ionized helium has opened ...
Spina Benedetta, Porciani Cristiano, Bosman Sarah E. I., Davies Frederick B., Garaldi Enrico, Keenan Ryan P., Schimd Carlo   +6 more
doaj   +1 more source

Statistical Detection of the He ii Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years

Frontiers in Astronomy and Space Sciences, 2017
The reionization of helium at z ~ 3 is the final phase transition of the intergalactic medium and supposed to be driven purely by quasars. The He ii transverse proximity effect—enhanced He ii transmission in a background sightline caused by the ionizing ...
Tobias M. Schmidt, Tobias M. Schmidt, Gabor Worseck, Joseph F. Hennawi, Joseph F. Hennawi, J. Xavier Prochaska, Neil H. M. Crighton, Zarija Lukić, Jose Oñorbe   +8 more
doaj   +1 more source

Dynamics of Purification in Cu2O

physica status solidi (b), Volume 263, Issue 3, March 2026.
Rydberg excitons in Cu2O have been shown to be highly efficient in neutralizing and screening charged impurities, which is referred to as purification. In this manuscript, the dynamics of the purification process are investigated under varying probe exciton‐ and plasma density. The transient absorption of Rydberg excitons is analyzed and five different
Binodbihari Panda, Juliane Rütter, Julian Heckötter, Marc Alexander Aßmann   +3 more
wiley   +1 more source

How is the reionization epoch defined? [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
We study the effect of a prolonged epoch of reionization on the angular power spectrum of the Cosmic Microwave Background. Typically reionization studies assume a sudden phase transition, with the intergalactic gas moving from a fully neutral to a fully ionized state at a fixed redshift. Such models are at odds, however, with detailed investigations of
Bruscoli, Marialuce, Ferrara, Andrea, Scannapieco, Evan   +2 more
openaire   +2 more sources

Asking Fast Radio Bursts for More than Reionization History

The Astrophysical Journal
We propose different estimators to probe the intergalactic medium (IGM) during the epoch of reionization (EoR) using the dispersion measure (DM) of the fast radio bursts. We consider three different reionization histories, which we can distinguish with a
Abinash Kumar Shaw, Raghunath Ghara, Paz Beniamini, Saleem Zaroubi, Pawan Kumar   +4 more
doaj   +1 more source