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Probable detection of HI at $zsimeq 1.3$ from DEEP2 galaxies using the GMRT | Shiv K. Sethi
; K. S. Dwarakanath
; Chandrashekar Murugesan
; | Date: |
17 May 2013 | Abstract: | We have observed the DEEP2 galaxies using the Giant Meterwave Radio Telescope
in the frequency band of 610 MHz. There are $simeq 400$ galaxies in the
redshift range $1.24 < z < 1.36$ and within the field of view
$simeq 44’$, 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 $8hbox{--}25 ,
m
mu$Jy/beam for a velocity width in the range $270hbox{--} 810 ,
m km ,
sec^{-1}$. The error on the signal, computed by bootstrapping, lies in the
range $2.5hbox{--}6 ,
m mu$Jy/beam, implying a 2.5--4.7-$sigma$
detection of the signal at $z simeq 1.3$. We compare our results with N-body
simulations of the
signal at $zsimeq 1$ and find reasonable agreement. We also discuss the
impact of residual continuum and systematics. | Source: | arXiv, 1305.4017 | Services: | Forum | Review | PDF | Favorites |
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