Statistics – Computation
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l.113c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 2, p. L113-L116.
Statistics
Computation
249
Bias, Cosmology, Dark Matter, Galactic Evolution, Universe, Computational Astrophysics, Computerized Simulation, Correlation Coefficients
Scientific paper
We have supplemented our code, which computes the evolution of the physical state of a representative piece of the universe to include, not only the dynamics of dark matter (with a standard PM code), and the hydrodynamics of the gaseous component (including detailed collisional and radiative processes), but also galaxy formation on a heuristic but plausible basis. If, within a cell the gas is Jeans' unstable, collapsing, and cooling rapidly, it is transformed to galaxy subunits, which are then followed with a collisionless code. After grouping them into galaxies, we estimate the relative distributions of galaxies and dark matter and the relative velocities of galaxies and dark matter. In a large scale CDM run of 80/h Mpc size with 8 x 10 exp 6 cells and dark matter particles, we find that physical bias b is on the 8/h Mpc scale is about 1.6 and increases towards smaller scales, and that velocity bias is about 0.8 on the same scale. The comparable HDM simulation is highly biased with b = 2.7 on the 8/h Mpc scale. Implications of these results are discussed in the light of the COBE observations which provide an accurate normalization for the initial power spectrum. CDM can be ruled out on the basis of too large a predicted small scale velocity dispersion at greater than 95 percent confidence level.
Cen Renyue
Ostriker Jeremiah P.
No associations
LandOfFree
Galaxy formation and physical bias does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Galaxy formation and physical bias, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy formation and physical bias will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1551821