Astrophys. J., 871, 50-50 (2019/January-3)
X-ray properties of SPT-selected galaxy clusters at 0.2 < z < 1.5 observed with XMM-Newton.
BULBUL E., CHIU I.-N., MOHR J.J., McDONALD M., BENSON B., BAUTZ M.W., BAYLISS M., BLEEM L., BRODWIN M., BOCQUET S., CAPASSO R., DIETRICH J.P., FORMAN B., HLAVACEK-LARRONDO J., HOLZAPFEL W.L., KHULLAR G., KLEIN M., KRAFT R., MILLER E.D., REICHARDT C., SARO A., SHARON K., STALDER B., SCHRABBACK T. and STANFORD A.
Abstract (from CDS):
We present measurements of the X-ray observables of the intracluster medium (ICM), including luminosity LX, ICM mass MICM, emission-weighted mean temperature TX, and integrated pressure YX, that are derived from XMM-Newton X-ray observations of a Sunyaev-Zel'dovich effect (SZE) selected sample of 59 galaxy clusters from the South Pole Telescope SPT-SZ survey that span the redshift range 0.20 < z < 1.5. We constrain the best-fit power-law scaling relations between X-ray observables, redshift, and halo mass. The halo masses are estimated based on previously published SZE observable-to-mass scaling relations, calibrated using information that includes the halo mass function. Employing SZE-based masses in this sample enables us to constrain these scaling relations for massive galaxy clusters (M500 >= 3 x 1014 M☉) to the highest redshifts where these clusters exist without concern for X-ray selection biases. We find that the mass trends are steeper than self-similarity in all cases, and with >=2.5σ significance in the case of LX and MICM. The redshift trends are consistent with the self-similar expectation, but the uncertainties remain large. Core-included scaling relations tend to have steeper mass trends for LX. There is no convincing evidence for a redshift-dependent mass trend in any observable. The constraints on the amplitudes of the fitted scaling relations are currently limited by the systematic uncertainties on the SZE-based halo masses, but the redshift and mass trends are limited by the X-ray sample size and the measurement uncertainties of the X-ray observables.
© 2019. The American Astronomical Society. All rights reserved.
large-scale structure of universe - X-rays: galaxies: clusters
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