TY - JOUR
T1 - Galaxy clusters at z ≥ 1
T2 - Gas constraints from the Sunyaev-Zel'dovich array
AU - Culverhouse, T. L.
AU - Bonamente, M.
AU - Bulbul, E.
AU - Carlstrom, J. E.
AU - Gralla, M. B.
AU - Greer, C.
AU - Hasler, N.
AU - Hawkins, D.
AU - Hennessy, R.
AU - Jetha, N. N.
AU - Joy, M.
AU - Lamb, J. W.
AU - Leitch, E. M.
AU - Marrone, D. P.
AU - Miller, A.
AU - Mroczkowski, T.
AU - Muchovej, S.
AU - Pryke, C.
AU - Sharp, M.
AU - Woody, D.
AU - Andreon, S.
AU - Maughan, B.
AU - Stanford, S. A.
PY - 2010/11/1
Y1 - 2010/11/1
N2 - We present gas constraints from Sunyaev-Zel'dovich (SZ) effect measurements in a sample of 11 X-ray and infrared (IR) selected galaxy clusters at z ≥1, using data from the Sunyaev-Zel'dovich Array (SZA). The cylindrically integrated Compton-y parameter, Y, is calculated by fitting the data to a two-parameter gas pressure profile. Where possible, we also determine the temperature of the hot intracluster plasma from Chandra and XMM-Newton data and constrain the gas mass within the same aperture (r2500) as Y. The SZ effect is detected in the clusters for which the X-ray data indicate gas masses above ∼10 13M⊙, including XMMU J2235-2557 at redshift z = 1.39, which to date is one of the most distant clusters detected using the SZ effect. None of the IR-selected targets are detected by the SZA measurements, indicating low gas masses for these objects. For these and the four other undetected clusters, we quote upper limits on Y andMgas,SZ, with the latter derived from scaling relations calibrated with lower redshift clusters. We compare the constraints on Y and X-ray-derived gas mass Mgas,X-ray to self-similar scaling relations between these observables determined from observations of lower redshift clusters, finding consistency given the measurement error.
AB - We present gas constraints from Sunyaev-Zel'dovich (SZ) effect measurements in a sample of 11 X-ray and infrared (IR) selected galaxy clusters at z ≥1, using data from the Sunyaev-Zel'dovich Array (SZA). The cylindrically integrated Compton-y parameter, Y, is calculated by fitting the data to a two-parameter gas pressure profile. Where possible, we also determine the temperature of the hot intracluster plasma from Chandra and XMM-Newton data and constrain the gas mass within the same aperture (r2500) as Y. The SZ effect is detected in the clusters for which the X-ray data indicate gas masses above ∼10 13M⊙, including XMMU J2235-2557 at redshift z = 1.39, which to date is one of the most distant clusters detected using the SZ effect. None of the IR-selected targets are detected by the SZA measurements, indicating low gas masses for these objects. For these and the four other undetected clusters, we quote upper limits on Y andMgas,SZ, with the latter derived from scaling relations calibrated with lower redshift clusters. We compare the constraints on Y and X-ray-derived gas mass Mgas,X-ray to self-similar scaling relations between these observables determined from observations of lower redshift clusters, finding consistency given the measurement error.
KW - Cosmic background radiation
KW - Cosmology: observations
KW - Galaxies: clusters: general
KW - Galaxies: clusters: intracluster medium
UR - https://www.scopus.com/pages/publications/78649307131
UR - https://www.scopus.com/pages/publications/78649307131#tab=citedBy
U2 - 10.1088/2041-8205/723/1/L78
DO - 10.1088/2041-8205/723/1/L78
M3 - Article
AN - SCOPUS:78649307131
SN - 2041-8205
VL - 723
SP - L78-L83
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1 PART 2
ER -