Results 121 to 130 of about 355,593 (244)
Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short‐Lived Radioactive Isotopes?
Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.ABSTRACT We run a three‐dimensional Galactic chemical evolution (GCE) model to follow the propagation of 53Mn (exclusively produced from type Ia supernovae, SNIa), 60Fe (exclusively produced from core‐collapse supernovae, CCSNe), 182Hf (exclusively produced from intermediate mass stars, IMSs), and 244Pu (exclusively produced from neutron star mergers ...
Benjamin Wehmeyer +5 more
wiley +1 more source
Scaling Relations of Early-Type Galaxies in MOND
GalaxiesWe investigate the shape and morphology of early-type galaxies (ETGs) within the framework of Modified Newtonian Dynamics (MOND). Building on our previous studies, which demonstrated that the monolithic collapse of primordial gas clouds in MOND produces ...
Robin Eappen, Pavel Kroupa
doaj +1 more source
Primordial Random Motions and Angular Momenta of Galaxies and Galaxy Clusters
The Astrophysical Journal, 1973 We study the decay of primordial random motions of galaxies and galaxy clusters in an expanding universe by solving a kinetic equation for the relaxation of differential energy spectra N(E, t). Systematic dissipative energy losses are included, involving gravitational drag by, and accretion of, intergalactic matter, as well as the effect of collisions ...
Joseph Silk, Susan Lea
openaire +1 more source
Recent Developments in Degenerate Higher Order Scalar Tensor Theories
Annalen der Physik, Volume 537, Issue 2, February 2025.Degenerate Higher Order Scalar Tensor theories are reviewed, together with their applications in cosmology and astrophysics. These theories have been applied to build models of the early universe, in the description of the late‐time cosmic acceleration, as well as in astrophysics, including black hole physics. They have the potential to provide answers
Andrei Lazanu
wiley +1 more source
Meteoritics &Planetary Science, Volume 60, Issue 2, Page 247-272, February 2025.Abstract Calcium‐aluminum‐rich inclusions (CAIs) are the first objects that formed in the solar accretion disk and therefore provide valuable insights into the evolution of the early solar system. A long‐standing question regarding this earliest formative period relates to the storage of CAIs in the 1–4 Myr time period between their formation and later
P. Ghaznavi +3 more
wiley +1 more source
Primordial Non-Gaussianity Systematics from Redshift Mismatch with SPHEREx
The Astrophysical JournalThe ability to differentiate between different models of inflation through the imprint of primordial non-Gaussianity (PNG) requires stringent constraints on the local PNG parameter ${f}_{\rm{NL}\,}^{\,\rm{loc}}$ .
Chandra Shekhar Saraf, David Parkinson
doaj +1 more source
Delayed star formation in high-redshift stream-fed galaxies
, 2013 We propose that star formation is delayed relative to the inflow rate in rapidly-accreting galaxies at very high redshift (z > 2) because of the energy conveyed by the accreting gas.
Bournaud, Frédéric, Gabor, Jared M.
core +1 more source
Primordial Axion Stars and Galaxy Halos Formation
UniversePrimordial axion stars, hypothetical stars formed from axions, could play an essential role in forming galaxy halos. These stars could have originated in the early universe shortly after the Big Bang. We show that while “normal” axions coalesce into a gravitationally bound Bose-Einstein condensate, forming a dense object - an axion star, the ultralight
openaire +2 more sources
Revisiting The First Galaxies: The epoch of Population III stars
, 2013 We investigate the transition from primordial Population III (Pop III) star formation to normal Pop II star formation in the first galaxies using new cosmological hydrodynamic simulations.
Gnedin, Nickolay Y. +3 more
core +1 more source
Nearby Young Dwarf Galaxies: Primordial Gas and Lyα Emission
The Astrophysical Journal, 1997 We present Hubble Space Telescope UV spectrophotometry of three extremely metal-deficient blue compact dwarf (BCD) galaxies, SBS 0335-052 (Z ~ Z☉/40), Tol 65 (Z ~ Z☉/24), and T1214-277 (Z ~ Z☉/23). Broad damped Lyα absorption is seen in the first two BCDs. For SBS 0335-052, the H I column density derived by fitting the Lyα absorption profile is N(H I) =
Trinh X. Thuan, Yuri I. Izotov
openaire +2 more sources