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Lyman alpha blobs - luminous, spatially extended emission-line nebulae, oftenlacking bright continuum counterparts - are common in dense environments athigh redshift. Until recently, atmospheric absorption and filter technologyhave limited our knowledge of any similar objects at z<2. We use GALEX slitlessspectroscopy to search for similar objects in the rich environments of twoknown cluster and supercluster fields at z=0.8, where the instrumentalsensitivity peaks. The regions around Cl 1054-0321 and Cl 0023+0423 were eachobserved in slitless-spectrum mode for 10-19 ksec, with accompanying directimages of 3-6 ksec to assist in recognizing continuum sources. Using severaldetection techniques, we find no resolved Lyman alpha emitters to a flux limitof(1.5-9) x 10^{-15} erg/ cm^2 s, on size scales of 5-30 arcseconds. Thiscorresponds to line luminosities of (0.5-3) x 10^43 erg/s for linear scales35-200 kpc. Comparison with both blind and targeted surveys at higher redshiftsindicates that the population must have evolved in comoving density at least asstrongly as (1+z)^3. These results suggest that the population of Lyman alphablobs is specific to the the high-redshift Universe.

The disappearance of Lyman alpha blobs: a GALEX search at z=0.8