Probable detection of HI at z≃ 1.3 from DEEP2 galaxies using the GMRT
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 ≃q 400 galaxies in the redshift range 1.24 < z < 1.36 and within the field of view
≃q 44'. We coadd the HI 21 cm-line emission at the locations of the 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 report a probable detection of the HI signal between 2-3σ level. For optimally-weighted cube, we obtain an average flux per halo: 17^{+8}_{-11} μJy and velocity width: 270^{+360}_{-180} km sec^{-1} (both 90% confidence limits). The average HI mass of a halo is M_{HI} ≃q 2 × 10^{10} M_⊙ and it lies in the range 0.35-8.3 10^{10} M_⊙ (90% confidence limit). We compare our results with existing N-body simulations and find reasonable agreement.- Publication:
-
Astronomical Society of India Conference Series
- Pub Date:
- 2014
- DOI:
- 10.48550/arXiv.1305.4017
- arXiv:
- arXiv:1305.4017
- Bibcode:
- 2014ASInC..13..239S
- Keywords:
-
- galaxies: high-redshift;
- radio lines: galaxies;
- cosmology: observations;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 24 pages, 6 figures