The power spectrum of dark matter halos in a CDM universe
- Los Alamos National Laboratory, MS B288, Los Alamos, New Mexico 87545 (United States)
- Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, D-804, Garching bei Muenchen (Germany)
It has been suggested that a COBE-normalized ``standard`` cold dark matter (CDM) universe has too much power on small scales compared to the power spectrum of IRAS galaxies. We present the results of an N-body simulation of such a universe and compare the redshift space {ital P}({ital k}) for dark matter halos to that of the IRAS and CfA galaxies. Over the scales that can be investigated in the simulation, {ital P}({ital k}) for halos with overdensities {delta}{similar_to}250 is in excellent agreement with {ital P}({ital k}) for the IRAS galaxies. {ital P}({ital k}) for halos with overdensities {delta}{similar_to}2000 (a more ``biased`` tracer of the mass than the {delta}{similar_to}250 halos) is in moderately good agreement with {ital P}({ital k}) for the CfA galaxies. Assuming one luminous galaxy per dark matter halo, we do not find an excess small-scale power problem for galaxies in a COBE-normalized standard CDM universe. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 249338
- Report Number(s):
- CONF-9410287-; ISSN 0094-243X; TRN: 96:014305
- Journal Information:
- AIP Conference Proceedings, Vol. 336, Issue 1; Conference: 5. astrophysics conference: dark matter, College Park, MD (United States), 10-12 Oct 1994; Other Information: PBD: 1 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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