A Mass and H0 Estimate from Sunyaev-Zel'dovich Effect, X-ray, and Optical Measurements of Galaxy Cluster Abell 1995

Details A Mass and H0 Estimate from Sunyaev-Zel'dovich Effect, X-ray, and Optical Measurements of Galaxy Cluster Abell 1995 A Mass and H0 Estimate from Sunyaev-Zel'dovich Effect, X-ray, and Optical Measurements of Galaxy Cluster Abell 1995

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.6403p&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #64.03; Bulletin of the American Astronomical Society, Vol. 31, p.1466

Astronomy and Astrophysics

Astronomy

Scientific paper

We present X-ray and Sunyaev-Zel'dovich Effect imaging, X-ray spectroscopy, and optical spectroscopy of the galaxy cluster Abell 1995. From these measurements, we determine several physical parameters of the cluster: an accurate redshift [0.3219+/-0.0014], galaxy velocity dispersion [1282+153-120 km s-1], core radius [32.5+2.9-4.3 arcsec], electron temperature [8.59+0.86-0.67 keV], and central electron number density [1.23+0.20-0.10 x 10-2 h100{1/2} cm-3]. The X-ray and Sunyaev-Zel'dovich Effect observations are combined to determine the cluster distance [DA =1241 Mpc +260-252(statistical) +407-551(systematic)], and hence yield a measure of the Hubble constant [H0 =50.3 km s-1 Mpc-1 +10.2-10.9(statistical) +22.3-16.7 (systematic)]. The X-ray data and optical velocity dispersion are also used to derive independent and consistent estimates of the total mass of the cluster, which are then combined with gas mass measurements to place constraints on the cluster gas fraction and baryon fraction.

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