Results 141 to 150 of about 27,730 (253)

A blazar in the epoch of reionization

open access: yesNature Astronomy
AbstractRelativistic jets are thought to play a crucial role in the formation and evolution of massive galaxies and supermassive black holes. Blazars, which are quasars with jets aligned along our line of sight, provide insights into the jetted population and have been observed up to redshifts of z = 6.1.
Eduardo Bañados   +23 more
openaire   +2 more sources

The Universe Was Reionized Twice [PDF]

open access: yesThe Astrophysical Journal, 2003
We show the universe was reionized twice, first at z~15-16 and second at z~6. Such an outcome appears inevitable, when normalizing to two well determined observational measurements, namely, the epoch of the final cosmological reionization at z~6 and the density fluctuations at z~6, which in turn are tight ly constrained by Lyman alpha forest ...
openaire   +3 more sources

On the contribution of dwarf galaxies to reionization of the Universe

open access: yesThe Open Journal of Astrophysics
We present estimates of the ultraviolet (UV) and Lyman continuum flux density contributed by galaxies of luminosities from $M_{\rm UV}\approx -25$ to $M_{\rm UV}=-4$ at redshifts $5\leq z\leq 10$ using a galaxy formation model that reproduces properties ...
Zewei Wu, Andrey Kravtsov
doaj   +1 more source

The Web Epoch of Reionization Lyα Survey (WERLS). I. MOSFIRE Spectroscopy of z ∼ 7–8 Lyα Emitters

open access: yesThe Astrophysical Journal
We present the first results from the Web Epoch of Reionization Ly α Survey (WERLS), a spectroscopic survey of Ly α emission using Keck I/MOSFIRE and LRIS.
Olivia R. Cooper   +36 more
doaj   +1 more source

Peering into the dark (ages) with low-frequency space interferometers: Using the 21-cm signal of neutral hydrogen from the infant universe to probe fundamental (Astro)physics. [PDF]

open access: yesExp Astron (Dordr), 2021
Koopmans LVE   +29 more
europepmc   +1 more source

Reionization and the Abundance of Galactic Satellites [PDF]

open access: bronze, 2000
James S. Bullock   +2 more
openalex   +1 more source

The Era of Reionization

open access: yes, 2002
10 pages, LaTeX, to appear in the proceedings of "Galaxy Evolution: Theory and Observations", Cozumel, Mexico, April 2002. Eds. V. Avila-Reese, C. Firmani, C. Frenk, & C. Allen, RevMexAA SC (2002)
openaire   +2 more sources

Impact of Self-shielding Minihalos on the Lyα Forest at High Redshift

open access: yesThe Astrophysical Journal
Dense gas in minihalos with masses of 10 ^6 −10 ^8 M _⊙ can shield themselves from reionization for ∼100 Myr after being exposed to the UV background.
Hyunbae Park   +4 more
doaj   +1 more source

Home - About - Disclaimer - Privacy