Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.518k&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The number counts (logN-logS relation) of X-ray clusters recently obtained from ROSAT surveys (Ebeling et al. 1997; Rosati et al. 1997) contain nearly 300 clusters, the largest cluster samples to date. In addition, the future projects such as PLANK and LMSA will provide rather independent cluster samples in mm/submm bands via the Sunyaev-Zel'dovich effect. We discuss in detail their implications on cosmology. Our main results include: 1) the observed X-ray logN-logS is reproduced remarkably well by a certain set of cosmological models, and can be used to constrain the density parameter Omega_0 and the fluctuation amplitude sigma_8; 2) if this result is combined with the COBE data, low-density universe is favored; 3) the redshift evolution of cluster population can place further constraints on Omega_0; 4) the cluster number counts in multi-bands, X-ray and submm, can provide further way of segregating viable cosmological models.
Kitayama Tetsu
Sasaki Satoshi
Suto Yasushi
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