Results 151 to 160 of about 247,655 (335)
The Star Formation Histories of Local Galaxies: Continuous or Intermittent? [PDF]
arXiv, 2001 We explore a model in which efficient star formation in galaxies is triggered by merging satellites. We show that the merger/interaction rates predicted by hierarchical galaxy formation models depend strongly on galaxy mass. If a merger of a satellite larger than 1% the mass of the primary triggers efficient star formation, low-mass dwarf galaxies ...
arxiv
Formation of Anisotropy in Galaxies [PDF]
Symposium - International Astronomical Union, 1996 Since observations of elliptical galaxies show only a small fraction of gaseous matter, dissipationless N-body models are mainly used to follow the dynamical evolution of these systems. In order to end up with the observed de Vaucouleurs profile these models must be initially very cold which leads finally to a velocity distribution that is isotropic in
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Otolaryngology–Head and Neck Surgery, EarlyView.Abstract Objective This study aims to understand the utility of a stepwise technology‐based audiometry with rapid results (STARR) school screening protocol. Study Design A prospective cohort study. Setting Six elementary schools in a single school district in Minnesota.
Autefeh Sajjadi +15 more
wiley +1 more source
The Impact of Molecular Hydrogen Cooling on the Galaxy Formation Threshold
The Astrophysical Journal LettersWe study the impact of molecular (H _2 ) and atomic (H i ) hydrogen cooling on the galaxy formation threshold. We calculate the fraction of dark matter (DM) halos that exceeds a critical mass required for star formation, M _crit ( z ), as a function of ...
Ethan O. Nadler
doaj +1 more source
Core condensation in heavy halos: a two-stage theory for galaxy formation and clustering [PDF]
, 1978 Simon D. M. White, M. J. Rees
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Homochiral Self‐Sorting During Macrocycle Formation and their Chiroptical Properties
ChemistryOpen, EarlyView.Imine condensation of C2‐symmetric chiral aldehydes with aliphatic amines results in 2 : 2 macrocycles lacking self‐sorting, whereas aromatic amines yield macrocycles with complete homochiral self‐sorting. These macrocycles exhibit unique chiroptical properties attributed to rigidification compared to the starting aldehydes.
Diptiprava Sahoo, Soumen De
wiley +1 more source
Galaxy and star formation up to z ~ 1 [PDF]
arXiv, 2001 Star formation history shows a gradual decline since the last 8-9 Gyr (z=1). The bulk of present-day stellar mass and metal content was formed at redshifts lower than 2-3, which is consistent with a hierarchical scenario of galaxy formation. Observations of galaxy evolution during the last 2/3 of the Universe age could be done in great details, and ...
arxiv
Numerical Simulations of Galaxy Formation [PDF]
, 1997 An overview over the current status of modeling galaxies by means of numerical simulations is given. After a short description of how galaxies form in hierarchically clustering scenarios, success and failures of current simulations are demonstrated using three different applications: the morphology of present day galaxies; the appearance of high ...
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Dynamical Models for the Formation and Evolution of Spherical Galaxies [PDF]
, 1974 Richard B. Larson
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