The BINGO project VIII: On the recoverability of the BAO signal on HI intensity mapping simulations

Abstract

A new and promising technique for observing the Universe and study the dark sector is the intensity mapping of the redshifted 21cm line of neutral hydrogen (HI). The BINGO radio telescope will use the 21cm line to map the Universe in the redshift range $0.127\le z\le 0.449$, in a tomographic approach, with the main goal of probing BAO. This work presents the forecasts of measuring the transversal BAO signal during the BINGO Phase 1 operation. We use two clustering estimators, the two-point angular correlation function (ACF) and the angular power spectrum (APS), and a template-based method to model the ACF and APS estimated from simulations of the BINGO region and extract the BAO information. The tomographic approach allows the combination of redshift bins to improve the template fitting performance. We find that each clustering estimator shows different sensitivities to specific redshift ranges, although both of them perform better at higher redshifts. In general, the APS estimator provides slightly better estimates, with smaller uncertainties and larger probability of detection of the BAO signal, achieving $\gtrsim 90$\% at higher redshifts. We investigate the contribution from instrumental noise and residual foreground signals and find that the former has the greater impact, getting more significant as the redshift increases, in particular the APS estimator. Indeed, including noise in the analysis increases the uncertainty up to a factor of $\sim 2.2$ at higher redshifts. Foreground residuals, in contrast, do not significantly affect our final uncertainties. In summary, our results show that, even including semi-realistic systematic effects, BINGO has the potential to successfully measure the BAO scale in radio frequencies. (Abridged)

18 pages, 6 figures. Submitted to A&A

References in corpus (18)

• The NumPy array: a structure for efficient numerical computation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• Separation of anomalous and synchrotron emissions using WMAP polarization data
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• Testing General Relativity with 21 cm intensity mapping
• Blind foreground subtraction for intensity mapping experiments
• Tracing The Sound Horizon Scale With Photometric Redshift Surveys
• Baryonic acoustic oscillations from 21cm intensity mapping: the Square Kilometre Array case
• Recovery of 21 cm intensity maps with sparse component separation
• Measuring the 2D Baryon Acoustic Oscillation signal of galaxies in WiggleZ: Cosmological constraints
• Baryon acoustic oscillations signature in the three-point angular correlation function from the SDSS-DR12 quasar survey
• A Joint Analysis for Cosmology and Photometric Redshift Calculation Using Cross Correlations
• Constraining low redshift [CII] Emission by Cross-Correlating FIRAS and BOSS Data