Structures in the Great Attractor region |
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| Authors: | D J Radburn-Smith J R Lucey P A Woudt R C Kraan-Korteweg F G Watson |
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| Institution: | Department of Physics, University of Durham, South Road, Durham DH1 3LE;Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa;Anglo-Australian Observatory, Coonabarabran, NSW 2357, Australia |
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| Abstract: | To further our understanding of the Great Attractor (GA), we have undertaken a redshift survey using the 2-degree Field (2dF) instrument on the Anglo-Australian Telescope (AAT). Clusters and filaments in the GA region were targeted with 25 separate pointings resulting in approximately 2600 new redshifts. Targets included poorly studied X-ray clusters from the Clusters in the Zone of Avoidance (CIZA) Catalogue as well as the Cen–Crux and PKS 1343?601 clusters, both of which lie close to the classic GA centre. For nine clusters in the region, we report velocity distributions as well as virial and projected mass estimates. The virial mass of CIZA J1324.7?5736, now identified as a separate structure from the Cen–Crux cluster, is found to be ～3 × 1014 M⊙ , in good agreement with the X-ray inferred mass. In the PKS 1343?601 field, five redshifts are measured of which four are new. An analysis of redshifts from this survey, in combination with those from the literature, reveals the dominant structure in the GA region to be a large filament, which appears to extend from Abell S0639 ( l = 281°, b =+11°) to ( l ～ 5°, b ～?50°) , encompassing the Cen–Crux, CIZA J1324.7?5736, Norma and Pavo II clusters. Behind the Norma cluster at cz ～ 15 000 km s?1 , the masses of four rich clusters are calculated. These clusters (Triangulum Australis, Ara, CIZA J1514.6?4558 and CIZA J1410.4?4246) may contribute to a continued large-scale flow beyond the GA. The results of these observations will be incorporated into a subsequent analysis of the GA flow. |
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| Keywords: | galaxies: clusters: general galaxies: distances and redshifts large-scale structure of Universe |
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