TY - JOUR
T1 - Intracluster comptonization of the cosmic microwave background
T2 - Mean spectral distortion and cluster number counts
AU - Colafrancesco, S.
AU - Mazzotta, P.
AU - Rephaeli, Y.
AU - Vittorio, N.
PY - 1997
Y1 - 1997
N2 - The mean sky-averaged Comptonization parameter, ȳ, describing the scattering of the cosmic microwave background (CMB) by hot gas in clusters of galaxies, is calculated in an array of flat and open cosmological and dark matter models. The models are globally normalized to fit cluster X-ray data, and intracluster gas is assumed to have evolved in a manner consistent with current observations. We predict values of ȳ lower than the COBE/FIRAS upper limit. The corresponding values of the overall optical thickness to Compton scattering are ≲ 10-4 for relevant parameter values. Of more practical importance are number counts of clusters across which a net flux (with respect to the CMB) higher than some limiting value can be detected. Such number counts are specifically predicted for the COBRAS/SAMBA and BOOMERANG missions.
AB - The mean sky-averaged Comptonization parameter, ȳ, describing the scattering of the cosmic microwave background (CMB) by hot gas in clusters of galaxies, is calculated in an array of flat and open cosmological and dark matter models. The models are globally normalized to fit cluster X-ray data, and intracluster gas is assumed to have evolved in a manner consistent with current observations. We predict values of ȳ lower than the COBE/FIRAS upper limit. The corresponding values of the overall optical thickness to Compton scattering are ≲ 10-4 for relevant parameter values. Of more practical importance are number counts of clusters across which a net flux (with respect to the CMB) higher than some limiting value can be detected. Such number counts are specifically predicted for the COBRAS/SAMBA and BOOMERANG missions.
KW - Cosmic microwave background
KW - Cosmology: theory
KW - Dark matter
KW - Galaxies: clusters: general
UR - http://www.scopus.com/inward/record.url?scp=21744439091&partnerID=8YFLogxK
U2 - 10.1086/303845
DO - 10.1086/303845
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:21744439091
SN - 0004-637X
VL - 479
SP - 1
EP - 16
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 PART I
ER -