The Hα Luminosity Function and Star Formation Rate at CLCITALz/ITAL/CLC ≈ 0.24 Based on Subaru Deep Imaging Data

We have carried out a deep imaging survey for H emitting galaxies at z0. 24 using a narrowband filter tuned with the redshifted line. The total sky area covered is 706 arcmin² within a redshift range from 0. 234 to 0. 252 (z=0. 018). This corresponds to a volume of 3. 910³ Mpc³ when ₌₀ₓₓ₄ₑ=0. 3, _=0. 7, and H₀=70 km s^-1 Mpc^-1 are adopted. We obtain a sample of 348 H emitting galaxies whose observed emission-line equivalent widths are greater than 12. We find an extinction-corrected H luminosity density of 10^39. 65^{+0. 08-₀. ₁₂} ergs s^-1 Mpc^-3. Using the Kennicutt relation between the H luminosity and star formation rate, the star formation rate density in the covered volume is estimated as 0. 036^+0. 006-₀. ₀₁₂ M_ yr^-1 Mpc^-3. This value is higher by a factor of 3 than the local SFR density.