Evidence for line-of-sight structure in a comparison of X-ray and optical observations of the high-redshift cluster RCS043938-2904.7

Details Evidence for line-of-sight structure in a comparison of X-ray and optical observations of the high-redshift cluster RCS043938-2904.7 Evidence for line-of-sight structure in a comparison of X-ray and optical observations of the high-redshift cluster RCS043938-2904.7

2007-10-29

arxiv.org/abs/0710.5535v3

ApJ 679: 293-300, 2008 May 20

Astronomy and Astrophysics

Astrophysics

23 pages, 6 Figures, ApJ Accepted; v2:revised for content and typos v3:notification of acceptance

Scientific paper

10.1086/586694

We present new Chandra observations of a high redshift (z~1) galaxy cluster discovered in the Red-Sequence Cluster Survey (RCS): RCS043938-2904.7. X-ray luminosity measurements and mass estimates are consistent with L_X-T_X and M_delta-T_X relationships obtained from low-redshift data. Assuming a single cluster, X-ray mass estimates are a factor of ~10-100 below the red-sequence optical richness mass estimate. Optical spectroscopy reveals that this cluster comprises two components which are close enough to perhaps be physically associated. We present simple modeling of this two-component system which then yields an X-ray mass and optical richness consistent with expectations from statistical samples of lower redshift clusters. An unexpectedly high gas mass fraction is measured assuming a single cluster, which independently supports this interpretation. Additional observations will be necessary to confirm the excess gas mass fraction and to constrain the mass distribution.

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