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2004ApJ...609..603H -
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Astrophys. J., 609, 603-616 (2004/July-2)
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X-ray temperatures for the extended medium-sensitivity survey high-redshift cluster sample: constraints on cosmology and the dark energy equation of state.
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HENRY J.P.
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Abstract (from CDS):
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We measure the X-ray temperature (and luminosity) with *ASCA* of all but one cluster in the *Einstein* Extended Medium-Sensitivity Survey (EMSS) high-redshift (z≥0.3) sample. We compare these data to a complete sample of low-redshift clusters that also has temperature measurements, thereby providing cosmological constraints. Improvements over our previous work include (1) an enlarged high-redshift sample; (2) temperatures for the low-redshift comparison sample that come from the same instrument as the high-redshift sample; (3) the elimination of three EMSS clusters with the same redshift as the target (i.e., not truly serendipitous) and a fourth with an *ASCA* flux well below the completeness limit; (4) using a theoretical cluster mass function that more closely matches *N*-body simulations (the Sheth-Torman function); (5) using a cold dark matter power spectrum instead of a power law; (6) using a general cosmology with arbitrary matter density and cosmological constant; (7) using a cosmology that generalizes the cosmological constant to quintessence; (8) including the effects of temperature measurement errors and scatter in the cluster luminosity-temperature relation; and (9) marginalizing over the poorly known normalization of the mass-temperature relation. We find an allowed band in the Ω_{m0}-Ω_{Λ0}plane of different orientation to the band of constraints provided by the supernovae Ia Hubble diagram and the cosmic microwave background fluctuations. All three bands intersect at the same place: Ω_{m0}~0.3, Ω_{Λ0}~0.7. We measure the quintessence equation-of-state parameter to be w=-(0.42±0.21) (68% confidence for one interesting parameter), consistent with previously determined upper limits. We measure the normalization of the mass fluctuation power spectrum to be σ_{8}=0.66±0.16 (68% confidence for three interesting parameters). Systematic errors are larger than the statistical errors only for σ_{8}with our sample; thus the errors for it depend on the details of the marginalization over the temperature-mass normalization.

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Abstract Copyright:
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∼

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Journal keyword(s):
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Cosmology: Cosmological Parameters - Cosmology: Observations - Galaxies: Clusters: General - Cosmology: Large-Scale Structure of Universe - X-Rays: Galaxies
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Errata:
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erratum vol. 732, art. 130 (2011)

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Simbad objects:
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53

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2020.02.24-10:09:24

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