Abstract

We analyse the redshifted HI emission from a DEEP2 field using the Giant Meterwave Radio Telescope in the frequency band of 610 MHz. There are ≃ 400 galaxies in the redshift range 1:24 < z < 1:36 and within the field of view ≃ 44'. We coadd the HI 21 cm-line emission at the locations of the DEEP2 galaxies. We apply stacking on three dierent data cubes: primary beam uncorrected, primary beam corrected (uniform weighing) and primary beam corrected (optimal weighing). We report a probable detection of the HI signal between 2–3σ level. For optimallyweighted cube, we obtain an average flux per halo: 17⁺⁸_-11 μJy and velocity 270⁺³⁶⁰_-180 km sec^-1 (both 90% confidence limits). The average HI mass of a halo is M_HI ≃ 2 X 10¹⁰M_ʘ and it lies in the range 0.35– 8.3 X 10¹⁰M_ʘ (90% confidence limit). We compare our results with existing N-body simulations and find reasonable agreement.