Matches in SemOpenAlex for { <https://semopenalex.org/work/W4317361134> ?p ?o ?g. }
- W4317361134 endingPage "2108" @default.
- W4317361134 startingPage "2094" @default.
- W4317361134 abstract "Neutral hydrogen ($rm{HI}$) $21$-cm intensity mapping (IM) offers an efficient technique for mapping the large-scale structures in the universe. We introduce the 'Cross' Tapered Gridded Estimator (Cross TGE), which cross-correlates two cross-polarizations (RR and LL) to estimate the multi-frequency angular power spectrum (MAPS) $C_{ell}(Deltanu)$. We expect this to mitigate several effects like noise bias, calibration errors etc., which affect the 'Total' TGE which combines the two polarizations. Here we apply the Cross TGE on a $24.4 ,rm{MHz}$ bandwidth uGMRT Band $3$ data centred at $432.8 ,rm{MHz}$ aiming $rm{HI}$ IM at $z=2.28$. The measured $C_{ell}(Deltanu)$ is modelled to yield maximum likelihood estimates of the foregrounds and the spherical power spectrum $P(k)$ in several $k$ bins. Considering the mean squared brightness temperature fluctuations, we report a $2sigma$ upper limit $Delta_{UL}^{2}(k) le (58.67)^{2} , {rm mK}^{2}$ at $k=0.804 , {rm Mpc}^{-1}$ which is a factor of $5.2$ improvement on our previous estimate based on the Total TGE. Assuming that the $rm{HI}$ traces the underlying matter distribution, we have modelled $C_{ell}(Deltanu)$ to simultaneously estimate the foregrounds and $[Omega_{rm{HI}} b_{rm{HI}}] $ where $Omega_{rm{HI}}$ and $b_{rm{HI}}$ are the $rm{HI}$ density and linear bias parameters respectively. We obtain a best fit value of $[Omega_{rm{HI}}b_{rm{HI}}]^2 = 7.51times 10^{-4} pm 1.47times 10^{-3}$ which is consistent with noise. Although the $2sigma$ upper limit $[Omega_{rm{HI}}b_{rm{HI}}]_{UL} leq 0.061$ is $sim 50$ times larger than the expected value, this is a considerable improvement over earlier works at this redshift." @default.
- W4317361134 created "2023-01-19" @default.
- W4317361134 creator A5007666626 @default.
- W4317361134 creator A5010292524 @default.
- W4317361134 creator A5026096668 @default.
- W4317361134 creator A5029902744 @default.
- W4317361134 creator A5035200762 @default.
- W4317361134 creator A5056505835 @default.
- W4317361134 creator A5061919092 @default.
- W4317361134 creator A5065381640 @default.
- W4317361134 creator A5072021105 @default.
- W4317361134 creator A5072334034 @default.
- W4317361134 creator A5081802238 @default.
- W4317361134 date "2023-01-19" @default.
- W4317361134 modified "2023-10-16" @default.
- W4317361134 title "Towards 21-cm intensity mapping at <i>z</i> = 2.28 with uGMRT using the tapered gridded estimator – II. Cross-polarization power spectrum" @default.
- W4317361134 cites W1499466692 @default.
- W4317361134 cites W1575564902 @default.
- W4317361134 cites W1671826411 @default.
- W4317361134 cites W1811619856 @default.
- W4317361134 cites W1887164287 @default.
- W4317361134 cites W1899149329 @default.
- W4317361134 cites W1927813542 @default.
- W4317361134 cites W1966541223 @default.
- W4317361134 cites W1966633224 @default.
- W4317361134 cites W1974913150 @default.
- W4317361134 cites W1975478564 @default.
- W4317361134 cites W1986881428 @default.
- W4317361134 cites W1992289600 @default.
- W4317361134 cites W1994024526 @default.
- W4317361134 cites W1996515241 @default.
- W4317361134 cites W1996622648 @default.
- W4317361134 cites W1997240893 @default.
- W4317361134 cites W2001490443 @default.
- W4317361134 cites W2005683908 @default.
- W4317361134 cites W2006803551 @default.
- W4317361134 cites W2015928792 @default.
- W4317361134 cites W2019814800 @default.
- W4317361134 cites W2020704120 @default.
- W4317361134 cites W2025670910 @default.
- W4317361134 cites W2027635416 @default.
- W4317361134 cites W2031659458 @default.
- W4317361134 cites W2033030037 @default.
- W4317361134 cites W2040454042 @default.
- W4317361134 cites W2045546516 @default.
- W4317361134 cites W2049728682 @default.
- W4317361134 cites W2052196743 @default.
- W4317361134 cites W2073938066 @default.
- W4317361134 cites W2078677259 @default.
- W4317361134 cites W2101687185 @default.
- W4317361134 cites W2117265214 @default.
- W4317361134 cites W2123793589 @default.
- W4317361134 cites W2125756700 @default.
- W4317361134 cites W2127254738 @default.
- W4317361134 cites W2133381645 @default.
- W4317361134 cites W2133593080 @default.
- W4317361134 cites W2134435348 @default.
- W4317361134 cites W2138451345 @default.
- W4317361134 cites W2146660402 @default.
- W4317361134 cites W2146710234 @default.
- W4317361134 cites W2158461310 @default.
- W4317361134 cites W2160502247 @default.
- W4317361134 cites W2163023297 @default.
- W4317361134 cites W2163066012 @default.
- W4317361134 cites W2167486124 @default.
- W4317361134 cites W2169866137 @default.
- W4317361134 cites W2170108704 @default.
- W4317361134 cites W2211491388 @default.
- W4317361134 cites W2234515242 @default.
- W4317361134 cites W2256956407 @default.
- W4317361134 cites W2293871229 @default.
- W4317361134 cites W2318746044 @default.
- W4317361134 cites W2330990687 @default.
- W4317361134 cites W2346560685 @default.
- W4317361134 cites W2355725808 @default.
- W4317361134 cites W2400638603 @default.
- W4317361134 cites W2401605885 @default.
- W4317361134 cites W2413988422 @default.
- W4317361134 cites W2489822048 @default.
- W4317361134 cites W2508630034 @default.
- W4317361134 cites W2611384902 @default.
- W4317361134 cites W2727805310 @default.
- W4317361134 cites W2762741961 @default.
- W4317361134 cites W2773631514 @default.
- W4317361134 cites W2791410825 @default.
- W4317361134 cites W2791693613 @default.
- W4317361134 cites W2896141835 @default.
- W4317361134 cites W2905819011 @default.
- W4317361134 cites W2948113290 @default.
- W4317361134 cites W2970373159 @default.
- W4317361134 cites W3005105000 @default.
- W4317361134 cites W3011249624 @default.
- W4317361134 cites W3020417722 @default.
- W4317361134 cites W3023491588 @default.
- W4317361134 cites W3024101511 @default.
- W4317361134 cites W3087633318 @default.
- W4317361134 cites W3097306519 @default.
- W4317361134 cites W3098268148 @default.