We have observed the DEEP2 galaxies 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′, of the GMRT dishes. We have coadded the HI 21 cm-line emissions at the locations of these DEEP2 galaxies. We apply stacking on three different data cubes: primary beam uncorrected, primary beam corrected (uniform weighing ) and primary beam corrected (optimal weighing). We obtain a peak signal strength in the range 8–25μJy/beam for a velocity width in the range 270–810kmsec−1. The error on the signal, computed by bootstrapping, lies in the range 2.5–6μJy/beam, implying a 2.5--4.7-σ detection of the signal at z≃1.3. We compare our results with N-body simulations of the signal at z≃1 and find reasonable agreement. We also discuss the impact of residual continuum and systematics.
@article{arxiv.1305.4017,
title = {Probable detection of HI at $z\simeq 1.3$ from DEEP2 galaxies using the GMRT},
author = {Shiv K. Sethi and K. S. Dwarakanath and Chandrashekar Murugesan},
journal= {arXiv preprint arXiv:1305.4017},
year = {2013}
}