Sarkar, Anjan Kumar ; Bharadwaj, Somnath ; Sarkar, Tapomoy Guha (2018) Predictions for measuring the cross power spectrum of the HI 21-cm signal and the Lyman-α forest using OWFA Journal of Cosmology and Astroparticle Physics, 2018 (05). 051-051. ISSN 1475-7516
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Official URL: http://doi.org/10.1088/1475-7516/2018/05/051
Related URL: http://dx.doi.org/10.1088/1475-7516/2018/05/051
Abstract
We have studied the possibility of measuring the cross-correlation of the redshifted HI 21-cm signal and the Lyman-α 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 σ detection of the cross-correlation signal with OWFA PII using an observing time of 200 hrs each in Np = 25 independent fields-of-view. However, not much can be done beyond this using the cross-correlation signal for zc = 3.35 and B = 30 MHz. Apart from this, we have also envisaged a situation where observations are carried out at zc = 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 MHz. We see that the SNR of the cross-correlation detection can be significantly enhanced to ~ 17 for zc = 2.55 and B = 60 MHz. It is then possible to measure βT and βF individually with an SNR ≥ 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 SNR ≥ 5 is also possible in several bins at k ≤ 0.3 Mpc−1.
Item Type: | Article |
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Source: | Copyright of this article belongs to IOP Publishing. |
ID Code: | 116291 |
Deposited On: | 09 Apr 2021 04:26 |
Last Modified: | 09 Apr 2021 04:26 |
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