The Lyman Alpha Blob

A team of astronomers used the European Southern Observatory’s Very Large Telescope (VLT), located at the Paranal Observatory in Chile, to study the Lyman-alpha blob. These huge structures of hydrogen gas are usually seen in regions of the early universe where matter is concentrated. Astronomers studied one of the first, largest and brightest known Lyman-alpha blobs LAB-1, which was discovered in 2000 and is so far away that its light takes about 11.5 billion years to reach Earth. LAB-1 measures about 300,000 light-years across. They found that the light was polarized in a ring around the central region but that there was no polarization at the center. This effect is almost impossible   if   light simply comes  from the gas falling into the blob due   to gravity.

So according to astronomers it would be expected if the light originated from galaxies embedded in the blob’s central region before becoming scattered by the gas.
source:www.space.com