Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.5803u&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #58.03; Bulletin of the American Astronomical Society, Vol. 24, p.822
Other
Scientific paper
The fragmentation of pancakes is numerically investigated by 3D smoothed particle hydrodynamics combined with N-body scheme, where the thermal processes by the cooling and heating are explicitly included and the self-gravity is calculated by the direct summation for all particle pairs. We consider baryon-dominated and hot dark matter-dominated pancakes. We find that the fragmentation is triggered in a central cooled dense layer of a pancake, and it obeys a two-step scenario: first the pancake exhibits some filamentary structures after collapse, and then they are torn to numerous fragments, eventually forming chain-like structures. The galaxy formation efficiency in pancake fragmentation is considerably small as fGF ~ exp [-2(M_pan/10(14}M_sun)({1/5)) ]. This is suggestive when compared with the recent observations on X-ray clusters. It is also found that the typical sizes of fragments are proportional to the pancake mass, M_pan. The mass of fragment is determined as M_b ~ 0.3-2times 10(12) M_sun (M_pan/10(15) M_sun) in baryonic component. Moreover the rotation curve of each fragment is asymptotically flat in the outer envelope. Other characteristic quantities as the total mass to baryon mass ratios, the line-of-sight relative peculiar velocity dispersion of fragments, the neutral hydrogen column density of each fragment at the high-redshift epoch, and the intergalactic gas heating and X-ray luminosity are also presented. The fragmentation processes are strongly dependent upon small-scale fluctuations. Unless there is any small-scale seed fluctuations, the pancakes cannot be fragmented. Therefore, a pure neutrino-dominated universe where small-scale fluctuations are thoroughly erased may be unsuccessful in galaxy formation. We require just a small amount of fluctuations of smaller scales than a neutrino collisionless damping scale for the formation of galaxies in the fragmentation scenario.
No associations
LandOfFree
3D Hydrodynamical Calculations on the Fragmentation of Pancakes and Galaxy Formation 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 3D Hydrodynamical Calculations on the Fragmentation of Pancakes and Galaxy Formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 3D Hydrodynamical Calculations on the Fragmentation of Pancakes and Galaxy Formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1513414