2024MNRAS.529.3372E

Query : 2024MNRAS.529.3372E

2024MNRAS.529.3372E - Mon. Not. R. Astron. Soc., 529, 3372-3386 (2024/April-3)

Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator - IV. Wide-band analysis.

ELAHI K.M.A., BHARADWAJ S., PAL S., GHOSH A., ALI S.S., CHOUDHURI S., CHAKRABORTY A., DATTA A., ROY N., CHOUDHURY M. and DUTTA P.

Abstract (from CDS):

We present a Wide-band tapered gridded estimator (TGE), which incorporates baseline migration and variation of the primary beam pattern for neutral hydrogen ($H\, {\small I}$) 21-cm intensity mapping (IM) with large frequency bandwidth radio-interferometric observations. Here we have analysed $394-494 \, {\rm MHz}$ (z = 1.9-2.6) uGMRT data to estimate the Multifrequency Angular Power Spectrum (MAPS) Cℓ(Δν) from which we have removed the foregrounds using the polynomial fitting (PF) and Gaussian Process Regression (GPR) methods developed in our earlier work. Using the residual Cℓ(Δν) to estimate the mean-squared 21-cm brightness temperature fluctuation Δ2(k), we find that this is consistent with 0 ± 2σ in several k bins. The resulting 2σ upper limit $\Delta ^2(k) \lt (4.68)^2 \, \rm {mK^2}$ at $k=0.219\, \rm {Mpc^{-1}}$ is nearly 15 times tighter than earlier limits obtained from a smaller bandwidth ($24.4 \, {\rm MHz}$) of the same data. The 2σ upper limit $[\Omega _{H\, {\small I}} b_{H\, {\small I}}] \lt 1.01 \times 10^{-2}$ is within an order of magnitude of the value expected from independent estimates of the $H\, {\small I}$ mass density $\Omega _{H\, {\small I}}$ and the $H\, {\small I}$ bias $b_{H\, {\small I}}$. The techniques used here can be applied to other telescopes and frequencies, including $\sim 150 \, {\rm MHz}$ Epoch of Reionization observations.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): methods: data analysis - methods: statistical - techniques: interferometric - diffuse radiation - large-scale structure of Universe

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ELAIS N1 reg 16 10 01 +54 30.6           ~ 489 0

Query : 2024MNRAS.529.3372E

Basic data :
ELAIS N1 -- Region defined in the Sky
Other object types: otypes_help 		reg (ELAIS)
ICRS coord. (ep=J2000) : 		16 10 01.0 +54 30 36 [ ] E 2000MNRAS.316..749O
FK4 coord. (ep=B1950 eq=1950) : 		16 08 50.4 +54 38 21 [ ]
Gal coord. (ep=J2000) : 		084.2827 +44.8975 [ ]
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ELAIS N1

References (489 between 1850 and 2026) (Total 489)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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