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Stars, Interstellar Medium and the Galaxy
UNLV Theses, Dissertations, Professional Papers, and Capstones
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- Accretion disk; Black holes (Astronomy); Extrasolar planets; Mathematical physics; Numerical simulation; Physical modeling; Physicsysics; Numerical simulation; Physical modeling; Physics; Stellar winds (1)
- Astrophysics (1)
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- Central engine (1)
- Cosmology (1)
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- Dominant nuclei (1)
- Galactic halos (1)
- Galaxies – Clusters (1)
- Galaxies – Formation (1)
- Galaxy formation (1)
- Gamma ray astronomy (1)
- Gamma ray bursts (1)
- Hydrogen (1)
- Interstellar hydrogen (1)
- Ion recombination (1)
- Large scale structure (1)
- Mielke (1)
- Observational data (1)
- Progenitor (1)
- Pure sciences (1)
- Rate coefficients (1)
- Recombination (1)
- Star formation (1)
- Stars – Formation (1)
Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
Constraining The Progenitor And Central Engine Of Gamma-Ray Bursts With Observational Data, Lu Houjun
Constraining The Progenitor And Central Engine Of Gamma-Ray Bursts With Observational Data, Lu Houjun
UNLV Theses, Dissertations, Professional Papers, and Capstones
Gamma-ray bursts (GRBs) are extremely energetic explosions at cosmological distances. We have made great progress in understanding the mysteries of these events since they were discovered more than forty years ago. However, some open questions still remain, e.g. how many classes of GRBs are there, what are the progenitors of these classes, and what is the central engine powering these huge explosions? Thanks to the NASA missions Swift and Fermi, which are used to detect the multi-wavelength emission from these transients, our understanding of GRBs has been greatly advanced. In this dissertation, I use multi-wavelength data to constrain the progenitor …
Molecular Processes In Astrophysics: Calculations Of H + H2 Excitation, De-Excitation, And Cooling, Matthew Kelley
Molecular Processes In Astrophysics: Calculations Of H + H2 Excitation, De-Excitation, And Cooling, Matthew Kelley
UNLV Theses, Dissertations, Professional Papers, and Capstones
The implications of H+H2 cooling in astrophysics is important to several applications. One of the most significant and pure applications is its role in cooling in the early universe. Other applications would include molecular dynamics in nebulae and their collapse into stars and astrophysical shocks. Shortly after the big bang, the universe was a hot primordial gas of photons, electrons, and nuclei among other ingredients. By far the most dominant nuclei in the early universe was hydrogen. In fact, in the early universe the matter density was 90 percent hydrogen and only 10 percent helium with small amounts of lithium …
Topics In Galaxy Formation: Pairwise Velocities Of Dark Matter Halos And Molecular Hydrogen Regulated Star Formation In Cosmological Simulations, Robert Jo Thompson
Topics In Galaxy Formation: Pairwise Velocities Of Dark Matter Halos And Molecular Hydrogen Regulated Star Formation In Cosmological Simulations, Robert Jo Thompson
UNLV Theses, Dissertations, Professional Papers, and Capstones
In this dissertation we investigate two distinct challenges within the concordance LCDM model and an unrelated project.
The first is a discrepancy between theory and observation. A massive galaxy sub-cluster known as the `bullet' has fallen through a more massive parent galaxy cluster at a redshift of z=0.296.
Theory finds that in order to reproduce the observational quantities of this cluster, an unusually high relative velocity of v12=3000 km/s between the two cluster's parent halos is required.
We quantify the statistical probability of producing a `bullet-like' halo pair within large N-body simulations, and
conclude that either the LCDM model is …
Numerical Simulations Of Accretion Disks And Extrasolar Planets, Stefan Luketic
Numerical Simulations Of Accretion Disks And Extrasolar Planets, Stefan Luketic
UNLV Theses, Dissertations, Professional Papers, and Capstones
We study mass outflows from astrophysical objects. Using numerical hydrodynamical simulations, we investigate outflows from accretion disks and exoplanets. In the first part of this dissertation, we present the results of Zeus 2D hydrodynamical simulations of the disk photosphere irradiated by strong X–rays that are produced in the innermost part of the disk of an accreting black hole. As expected, the irradiation heats the photosphere and drives a thermal wind. To apply our results to the well– studied X–ray transient source GRO J1655–40, we utilized the observed mass of its black hole and the observed properties of its X–ray radiation …