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The latest on the Great Attractor

Renée C. Kraan-Korteweg (Astronomy Department, Univ. of Cape Town)

Évènements associés

  • Le mercredi 2 mars 2011 de 11:00 à 12:00 - lieu : Communs, salle 108

I will give a brief overview of the current status of the mapping of the Great Attractor (GA) mass overdensity which is mostly hidden from our view by the Milky Way. We find that the combined results from optical, NIR (FIR, X-ray) and in particular the systematic Parkes HI surveys find the GA to consist of a nearby Great-Wall like structure that crosses the Zone of Avoidance diagonally.

However, questions like « how massive is the GA really » and "who is pulling in the Zone of Avoidance", the so-called GA versus Shapley controversy, still remain unanswered. Because of this and following the unexpected discovery of two galaxies at the most obscured part (20 mag in the optical) of the GA Wall with Spitzer and ATCA observations we launched further infrared surveys. I will present the most recent results on the GA Wall from a dedicated deep NIR survey across the most opaque part of the Zone of Avoidance and its mass-density estimate, as well as preliminary results from the flow-field derived around the GA from a NIR Tully-Fisher analysis of HI detected galaxies in the ZOA. If time permits I will hint at some of tug-and-war in this area that is happening at even larger distances and how future SKA Pathfinder HI surveys may resolve this controversy.

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