Results 121 to 130 of about 431,836 (261)
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
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Formation of H2and Galaxies in the Hot Universe [PDF]
, 1969 Hidenori Takeda +2 more
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Formation Models of Galaxies [PDF]
Symposium - International Astronomical Union, 1995 Unfortunately Dr. White was not able to finish a written version of his presentation at the Symposium in time for inclusion in these proceedings. He refers the interested readers to his lecture notes at the August 1993 Les Houches summer school (White, 1995).
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Quasars and Galaxy Formation [PDF]
Astron.Astrophys.331:L1-14,1998, 1998 The formation of massive black holes may precede the epoch that characterises the peak of galaxy formation, as characterized by the star formation history in luminous galaxies. Hence protogalactic star formation may be profoundly affected by quasar-like nuclei and their associated extensive energetic outflows.
arxiv
The Astrophysical JournalReconstructing the mass assembly history of the Milky Way relies on obtaining detailed measurements of the properties of many stars in the galaxy, especially in the stellar halo.
Danny Horta +4 more
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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
The Astrophysical JournalThe formation pathways of lenticular galaxies (S0s) in field environments remain a matter of debate. We utilize the cosmological hydrodynamic simulation, NewHorizon , to investigate the issue. We select two massive star formation quenched S0s as our main
Seongbong Han +11 more
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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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Galaxy Formation from Annihilation-Generated Supersonic Turbulence in the Baryon-Symmetric Big-Bang Cosmology and the Gamma-Ray Background Spectrum [PDF]
, 1972 F. W. Stecker, J.‐L. Puget
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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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