Images of the four Lyα blob candidates. From left to right are the NB403, NDWFS B_W, and continuum-subtracted (NB−B_W) images. The ticks are spaced every 10'', which corresponds to ~82 physical kpc at z = 2.3. The elliptical apertures used for photometry and blob identification are shown in the left panels. The B_W images are smoothed to match the seeing of the NB images. In the right panels, the contours represent the surface-brightness limit of 5 × 10⁻¹⁸ erg s⁻¹ cm⁻² arcsec⁻², within which we determine the blob sizes. The location of the 15-wide slit used for spectroscopic followup with the 6.5 m MMT is shown for Blobs 1, 2, and 3 in the B_W image. We spectroscopically confirm that all four blobs lie at z = 2.3 (Figure 6). Blobs 3 and 4 are broad-line QSOs that are both detected in X-rays [L_X(2–7 keV) = 1.6–4.1 × 10⁴⁴ erg s⁻¹]. None of the blobs are radio-loud.