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| Paper: |
CIZA: X-ray Selected Galaxy Clusters as Tracers of Large-Scale Structure and Streaming Motions behind the Galactic Plane |
| Volume: |
329, Nearby Large-Scale Structures and the Zone of Avoidance |
| Page: |
83 |
| Authors: |
Ebeling, H.; Kocevski, D.; Tully, R.B.; Mullis, C.R. |
| Abstract: |
We report on the design and status of the CIZA project, the first systematic X-ray search for clusters of galaxies behind the Milky Way. We discuss the rationale for such a survey in the context of large-scale structure studies and describe the X-ray/optical observations used by CIZA to identify clusters of galaxies at |b| < 20°, a region of the sky that has traditionally been excluded from earlier cluster catalogues. So far, CIZA has identified and spectroscopically confirmed 191 galaxy clusters in what used to be the Zone of Avoidance; additional clusters have been confirmed in imaging observations and await spectroscopic observation. We re-assess local large-scale structure in the Great Attractor (GA) region in the light of this first X-ray selected cluster sample at low Galactic latitude, and argue that this region of the GA may be best described as a wall-like, triangular structure. Our survey also discovered what could be a supercluster in the same region but at cz ~ 15000 km s−1, i.e. behind the GA. We speculate that the latter system may be partly responsible for the large-scale flow observed in this direction out to about that distance. Additional results from the CIZA project are discussed by Mullis et al. and Kocevski et al. in these proceedings. |
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