Proceedings of the Particle Physics and Early Universe Conference (PPEUC).
For this paper: postscript up PPEUC CMB index next 1 Introduction...

Search for Intra-Supercluster Gas in the Shapley Concentration

S. M. Molnar

Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K.

M. Birkinshaw

Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K.

Abstract:

We set limits to the amount of intra-supercluster gas in the Shapley Supercluster, using COBE DMR data to search for the Sunyaev-Zel'dovich effect and HEAO-1 A2 and ROSAT All-Sky Survey data to search for diffuse X-ray emission. We modeled the X-ray emission allowing for known point sources and a gradient in galactic emission. We found no evidence for intra-supercluster gas following a truncated isothermal model distribution. We concluded that the Shapley Supercluster does not hold much more hot () large scale diffuse intra-supercluster gas than the average baryon density derived from standard nucleosynthesis theories. The next generation of satellites may detect gas in the intra-supercluster environment. These satellites will have an important cosmological impact, since they will enable precise estimates of the baryonic content of superclusters.



PPEUC Proceedings
Thu Jun 19 14:50:07 BST 1997