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We report the properties of the 35 robust candidates of Ly-alpha blobs(LABs), which are larger than 16 arcsec^2 in isophotal area and brighter than0.7 x 10^-16 ergs s^-1 cm^-2, searched in and around the proto-cluster regionat redshift z=3.1 discovered by Steidel et al. in the SSA22 field, based onwide-field (31'x23') and deep narrow-band (NB497; 4977/77) and broad-band (B,V,and R) images taken with the prime-focus camera on the Subaru telescope. Thetwo previously known giant LABs are the most luminous and the largest ones inour survey volume of 1.3 x 10^5 Mpc^3. We revealed the internal structures ofthe two giant LABs and discovered some bubble-like features, which suggest thatintensive starburst and galactic superwind phenomena occurred in these objectsin the past. The rest 33 LABs have isophotal area of about 16-78 arcsec^2 andflux of 0.7-7 x 10^-16 ergs s^-1 cm^-2. These 35 LABs show a continuousdistribution of isophotal area and emission line flux. The distributions ofaverage surface brightness and morphology are widespread from relativelycompact high surface brightness objects to very diffuse low surface brightnessones. The physical origins of these LABs may be (i) photo-ionization by massivestars, or active galactic nuclei, or (ii) cooling radiation fromgravitationally heated gas, or (iii) shock heating by starburst driven galacticsuperwind. One third of them are apparently not associated with ultra-violetcontinuum sources that are bright enough to produce Ly-alpha emission, assuminga Salpeter initial mass function. The 90% of these LABs are located inside thehigh surface density region of the 283 relatively compact and strong Ly-alphaemitters selected in our previous study. This suggests that these LABs may bethe phenomena related to dense environment at high redshift.

A Subaru Search for Lyα Blobs in and around the Protocluster Region At Redshiftz= 3.1