Predictions for measuring the cross power spectrum of the HI 21-cm signal and the Lyman-$\alpha$ forest using OWFA

Abstract

We have studied the possibility of measuring the cross-correlation of the redshifted HI 21-cm signal and the Lyman-$\alpha$ forest using an upcoming radio-interferometric array OWFA and an spectroscopic observation like SDSS-IV. Our results shows that it is possible to have a $6\sigma$ detection of the cross-correlation signal with OWFA PII using an observing time of $200$ hrs each in $N_p=25$ independent fields-of-view. However, not much can be done beyond this using the cross-correlation signal for $z_c=3.35$ and $B=30\mathrm{MHz}$. Apart from this, we have also envisaged a situation where observations are carried out at $z_c=3.05$ and $2.55$ which lie closer to the peak of the quasar distribution at $z=2.25$ and with a larger bandwidth of $B=60\mathrm{MHz}$. We see that the SNR of the cross-correlation detection can be significantly enhanced to $\sim 17$ for $z_c=2.55$ and $B=60\mathrm{MHz}$. It is then possible to measure ${\beta }_T$ and ${\beta }_F$ individually with an $\mathrm{SNR}\ge 5$ by combining the cross-correlation with the HI 21-cm auto-correlation measurements. We further find that a measurement of the binned cross-correlation power spectrum with $\mathrm{SNR}\ge 5$ is also possible in several bins at $k\le 0.3{\mathrm{Mpc}}^{-1}$.

To be submitted in JCAP

References in corpus (15)

• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• On the (Non)Evolution of HI Disks over Cosmic Time
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-alpha forest
• Modeling the neutral hydrogen distribution in the post-reionization Universe: intensity mapping
• A combined analysis of 3D Weak Lensing, Lyman-alpha forest and WMAP year three data
• Estimation of Cosmological Parameters from HI Observations of Post-reionization Epoch
• Cosmological constraints from 21cm surveys after reionization
• A High Speed Networked Signal Processing Platform for Multi-element Radio Telescopes
• Fisher Matrix Based Predictions for Measuring the z = 3.35 Binned 21-cm Power Spectrum using the Ooty Wide Field Array (OWFA)
• Probing primordial non-Gaussianity: The 3D Bispectrum of Ly-alpha forest and the redshifted 21-cm signal from the post reionization epoch
• An analytical method to simulate the HI 21-cm visibility signal for intensity mapping experiments

Cited by in corpus (8)

• Ingredients for 21cm intensity mapping
• Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
• Modelling the post-reionization neutral hydrogen ($\mathrm{HI}$) 21-cm bispectrum
• Simulated Predictions for HI at $z=3.35$ with the Ooty Wide Field Array (OWFA) -- II: Foreground Avoidance
• Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of $f(R)$ gravity
• Constraining warm dark matter power spectrum using the cross-correlation of HI 21 cm signal and the Lyman-$\alpha$ forest
• Reionization relics in the cross-correlation between the Ly$\alpha$ forest and 21 cm intensity mapping in the post-reionization era
• Probing dark energy using anisotropies in the clustering of post-EoR HI distribution