Resolving the Formation of Protogalaxies. II.Central Gravitational Collapse

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Numerous cosmological hydrodynamic studies have addressed the formation of galaxies. Here we choose to study the first stages of galaxy formation, including non-equilibrium atomic primordial gas cooling, gravity and hydrodynamics. Using initial conditions appropriate for the concordance cosmological model of structure formation, we perform two adaptive mesh refinement simulations of {approx} 10{sup 8} M{sub {circle_dot}} galaxies at high redshift. The calculations resolve the Jeans length at all times with more than 16 cells and capture over 14 orders of magnitude in length scales. In both cases, the dense, 10{sup 5} solar mass, one parsec central regions are found to contract ... continued below

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14 pages

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Wise, John H.; Turk, Matthew J. & Abel, Tom October 15, 2007.

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Numerous cosmological hydrodynamic studies have addressed the formation of galaxies. Here we choose to study the first stages of galaxy formation, including non-equilibrium atomic primordial gas cooling, gravity and hydrodynamics. Using initial conditions appropriate for the concordance cosmological model of structure formation, we perform two adaptive mesh refinement simulations of {approx} 10{sup 8} M{sub {circle_dot}} galaxies at high redshift. The calculations resolve the Jeans length at all times with more than 16 cells and capture over 14 orders of magnitude in length scales. In both cases, the dense, 10{sup 5} solar mass, one parsec central regions are found to contract rapidly and have turbulent Mach numbers up to 4. Despite the ever decreasing Jeans length of the isothermal gas, we only find one site of fragmentation during the collapse. However, rotational secular bar instabilities transport angular momentum outwards in the central parsec as the gas continues to collapse and lead to multiple nested unstable fragments with decreasing masses down to sub-Jupiter mass scales. Although these numerical experiments neglect star formation and feedback, they clearly highlight the physics of turbulence in gravitationally collapsing gas. The angular momentum segregation seen in our calculations plays an important role in theories that form supermassive black holes from gaseous collapse.

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14 pages

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  • Journal Name: Astrophysical Journal

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  • Report No.: SLAC-PUB-12883
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 918012
  • Archival Resource Key: ark:/67531/metadc888420

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 15, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 8, 2016, 9:14 p.m.

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Wise, John H.; Turk, Matthew J. & Abel, Tom. Resolving the Formation of Protogalaxies. II.Central Gravitational Collapse, article, October 15, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc888420/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.