``The Distance and Mass of the Galaxy Cluster Abell 1995 Derived from
SunyaevZel'dovich Effect and Xray Measurements''

Abstract
We present multiwavelength observations of the Abell 1995 galaxy cluster. From
analysis of xray spectroscopy and imaging data we derive the electron temperature, cluster core radius, and central electron number density. Using optical spectroscopy of 15 cluster members, we derive an accurate cluster redshift and velocity dispersion. Finally, the interferometric imaging of the SZE toward Abell 1995 at 28.5 GHz provides a measure of the integrated pressure through the cluster.
The xray and SZE observations are combined to determine the angular diameter
distance to the cluster of D_A=1294(+297286) (+438459) Mpc (statistical followed by systematic uncertainty), implying a Hubble constant of
H_0=52(+/12)(+/18)km/s/Mpc for OmegaM=0.3 and OmegaL=0.7.
We find a best fit H0 of 46km/s/Mpc for the OmegaM=1 cosmology,
and 48km/s/Mpc for OmegaM=0.3.
The xray data are also used to derive a total cluster mass of
M_tot^HSE=5.18(+0.620.48)x10^{14} h^{1}M_o; the optical velocity
dispersion yields an independent and consistent estimate of
M_{tot}^{virial}(\rad)=6.35^{+1.51}_{1.19}x10^{14} h^{1}M_o$.
Both of the total mass estimates are evaluated at a fiducial
radius of 830 h^{1}$ kpc, where the overdensity is 500
times the critical density. The total cluster mass is then combined
with gas mass measurements to determine a cluster gas mass fraction
of $f_g=0.056^{+0.010}_{0.013} h^{3/2}$.
In combination with recent baryon density constraints,
the measured gas mass fraction yields an upper limit on the mass density
parameter Omega_M h^{1/2} \leq 0.34 ^{+0.06}_{0.05}.

