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- W2963302502 endingPage "058" @default.
- W2963302502 startingPage "058" @default.
- W2963302502 abstract "We have considered the prospects for measuring the cross Warm Dark Matter (WDM) power spectrum of the redshifted HI 21-cm signal and the Lyman-$alpha$ forest and thereby constraining WDM mass using observations with upcoming radio-interferometers - the Ooty Wide Field Array (OWFA) and SKA1-mid, and a spectroscopic survey of the quasars. We have considered a quasar survey with a mean observed quasar number density of $bar{{rm n}}_{rm Q} = 48$ deg$^{-2}$ over a collecting area of 14455 deg$^{2}$, and a mean spectroscopic SNR = 5. Our analysis with OWFA shows that it is possible to measure the WDM power spectrum in several $k$-bins at $k < 0.4$ Mpc$^{-1}$ with ${rm SNR} > 5$ using an observation of 200 hours each in 100 different fields-of-view for $m_{rm WDM} = 0.25$ keV. Considering the possibility of the joint measurement of the parameters, the warm dark matter density parameter $Omega_{{rm WDM}}$, and the dark energy density parameter $Omega_{Lambda0}$, we find that the relative error on the $1-sigma$ measurement of the parameter $Omega_{{rm WDM}}$ is $sim 0.8$ for a fiducial $m_{rm WDM} = 0.25$ keV. We further find that it is possible to have a measurement of the suppression of power from the Cold Dark Matter (CDM) power spectrum at a confidence level of $sim 7.2-sigma$ and $sim 2.7-sigma$ in two different $k$-bins over the $k$-range $0.1 leq k leq 3.13$ Mpc$^{-1}$ for $m_{rm WDM} = 0.15$ keV. Considering the analysis with SKA1-mid, we find that for a fiducial $m_{rm WDM}= 0.25$ keV, the suppression in the cross power spectrum can be measured at $sim 10 - sigma$ around $k sim 0.2 rm{Mpc}^{-1}$ for a total observing time of $20000$ hrs distributed uniformly over $50$ independent pointings where the available $k$-range is binned as $Delta k = k/5$." @default.
- W2963302502 created "2019-07-30" @default.
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- W2963302502 date "2019-12-19" @default.
- W2963302502 modified "2023-09-25" @default.
- W2963302502 title "Constraining warm dark matter power spectrum using the cross-correlation of HI 21 cm signal and the Lyman-α forest" @default.
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- W2963302502 doi "https://doi.org/10.1088/1475-7516/2019/12/058" @default.
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