Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme

Details Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pthph.102...51h&link_type=abstract

Progress of Theoretical Physics, Vol. 102, No. 1, pp. 51-70.

Physics

1

Scientific paper

The hierarchical structure of astronomical objects is investigated in the cosmic string scheme with cold dark matter (CDM). A non-linear dark matter potential is formed in the crossing site of three wakes triggered at around zi by moving strings. If we use this scheme, the mass and radius of formed CDM objects increase gradually as M &prop (1+z)-3 and R &prop (1+z)-2, and objects triggered at zi ~= 104, 105 and 106 grow to become objects corresponding to clusters of galaxies, galaxies and dwarf galaxies, respectively. The number densities of these objects n(zi) are related to the size l (zi, z) as n(zi) &prop 1/ l (zi, z)3, where l (zi, z) is the horizon size of the stage zi observed at z. One of the interesting points of this scheme is that smaller objects are gradually accreted into larger ones. For example, dwarf galaxies have been mostly accreted into galaxies at the present. Galaxies are still now accumulating toward clusters of galaxies, and consequently many of accreted galaxies are found as E or SO type galaxies there. In the future, or possibly even at the present time, clusters of galaxies will be accreted into superclusters of galaxies triggered at zi ~= 103. Heating through the accumulation of baryonic matter in the CDM gravitational potential is also investigated and it is found that their heating is not sufficient to reionize the universe before z ~= 5. Therefore some other heating sources or mechanisms are required. However, heating through the accumulation of baryonic matter could explain the X-ray properties of clusters of galaxies.

Affiliated with

Also associated with

No associations

Rating

Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme 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 Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hierarchical Structure of Astronomical Objects in the Cosmic String Scheme will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1577106