Results 21 to 30 of about 107,692 (266)

The origin of the first neutron star – neutron star merger [PDF]

Astronomy & Astrophysics, 2018
The first neutron star-neutron star (NS-NS) merger was discovered on August 17, 2017 through gravitational waves (GW170817) and followed with electromagnetic observations. This merger was detected in an old elliptical galaxy with no recent star formation. We perform a suite of numerical calculations to understand the formation mechanism of this merger.
Belczynski, K., Askar, A., Arca-Sedda, M., Chruslinska, M., Donnari, M., Giersz, M., Benacquista, M., Spurzem, R., Jin, D., Wiktorowicz, G., Belloni, D.   +10 more
openaire   +5 more sources

The Formation of the First Star in the Universe [PDF]

Science, 2002
We describe results from a fully self-consistent three-dimensional hydrodynamical simulation of the formation of one of the first stars in the Universe. In current models of structure formation, dark matter initially dominates, and pregalactic objects form because of gravitational instability from small initial density perturbations.
Abel, Tom, Bryan, Greg L., Norman, Michael L.   +2 more
openaire   +3 more sources

Evidence of First Stars-enriched Gas in High-redshift Absorbers

The Astrophysical Journal, 2023
The first stars were born from chemically pristine gas. They were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements.
Andrea Saccardi, Stefania Salvadori, Valentina D’Odorico, Guido Cupani, Michele Fumagalli, Trystyn A. M. Berg, George D. Becker, Sara Ellison, Sebastian Lopez   +8 more
doaj   +1 more source

The formation of the first stars and galaxies [PDF]

Nature, 2009
Review article, 27 pages, 5 ...
Bromm, Volker, Yoshida, Naoki, Hernquist, Lars, McKee, Christopher F.   +3 more
openaire   +5 more sources

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

The First Stars

Annual Review of Astronomy and Astrophysics, 2004
▪ Abstract  We review recent theoretical results on the formation of the first stars in the universe, and emphasize related open questions. In particular, we discuss the initial conditions for Population III star formation, as given by variants of the cold dark matter cosmology.
Bromm, Volker, Larson, Richard B.
openaire   +2 more sources

THE MASS SPECTRUM OF THE FIRST STARS [PDF]

The Astrophysical Journal, 2014
18 pages ApJ ...
Hajime Susa, Kenji Hasegawa, Nozomu Tominaga   +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

Effect of primordial black holes on the global 21 cm signal

Astronomy & Astrophysics
The 21 cm global signal, a treasure trove of information about the nature of the first luminous sources of the Universe, has traditionally been modelled assuming that these early sources were predominantly star-forming galaxies.
Chatterjee Atrideb
doaj   +1 more source

Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds

The Astrophysical Journal, 2023
Massive stars (∼8–25 M _⊙ ) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae.
Y. Götberg, M. R. Drout, A. P. Ji, J. H. Groh, B. A. Ludwig, P. A. Crowther, N. Smith, A. de Koter, S. E. de Mink   +8 more
doaj   +1 more source