Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: H0 from an orientation-unbiased sample of SZ and X-ray clusters   We have observed the Sunyaev-Zel'dovich effect in a sample of five
moderate-redshift clusters with the Ryle Telescope, and used them in
conjunction with X-ray imaging and spectral data from ROSAT and ASCA to measure
the Hubble constant. This sample was chosen with a strict X-ray flux limit
using both the BCS and NORAS cluster catalogues to be well above the
surface-brightness limit of the ROSAT All-Sky Survey, and hence to be unbiased
with respect to the orientation of the cluster. This controls the major
potential systematic effect in the SZ/X-ray method of measureing H0. Taking the
weighted geometric mean of the results and including the main sources of random
error, namely the noise in the SZ measurement, the uncertainty in the X-ray
temperatures and the unknown ellipticity of the clusters, we find H0 = 59 +8/-7
km/s/Mpc assuming a standard CDM model with Omega_M = 1.0, Omega_Lambda = 0.0,
or H0 = 65 +8/-7 km/s/Mpc if Omega_M = 0.3, Omega_Lambda = 0.7.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
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The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: math