VSA Results. A new Survey in the Corona Borealis Supercluster
Using the new superextended configuration of the VSA, we have performed observations on the very deep decrement in the Corona Borealis supercluster discovered with the previous extended configuration (Genova-Santos et al. 2005). A total area of 3 square degrees has now been imaged, with an angular resolution of 7 arcmin. The new maps have a finer angular resolution, and confirm the presence of this non-Gaussian spot, at a signal-to-noise level of 7.
Our statistical analyses bear out that this structure deviates significantly (4.4-sigma) from the primordial CMB. As a result, these observations reinforces the hypothesis of a different component in this decrement, probably generated via the extended SZ effect from a WHIM structure located within this supercluster. This hypothesis is especially relevant, as the presence of such structures, if confirmed, could provide the location for a significant fraction of the missing baryons in the Local Universe.
For further details, see Génova-Santos et al. (2008).
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(April 2008)