Astrophysics (Index)About

cold spot

(CMB cold spot, WMAP cold spot)
(unusually colder spot in the CMB)

A cold spot (or cosmic microwave background cold spot or WMAP cold spot) is an area of the celestial sphere where the CMB indicates a slightly lower black body temperature than the rest, a difference on the order of 70 millionths of a kelvin. The CMB black body temperature has a random distribution around a specific value (about 2.72548 K) except for this region. There has been some investigation regarding whether the apparent colder region corresponds to a void or voids in that direction, e.g., from the Sachs-Wolfe effect.

Further reading:
Coordinates:cold spot

Referenced by page:
topological defect