Synergies between intensity maps of hydrogen lines
arXiv:1803.07077 · doi:10.1093/mnras/sty1702
Abstract
We study synergies between HI 21cm and H intensity map observations, focusing on SKA1-like and SPHEREx-like surveys. We forecast how well such a combination can measure features in the angular power spectrum on the largest scales, that arise from primordial non-Gaussianity and from general relativistic effects. For the first time we consider Doppler, Sachs-Wolfe and integrated SW effects separately. We confirm that the single-tracer surveys on their own cannot detect general relativistic effects and can constrain the non-Gaussianity parameter only slightly better than Planck. Using the multi-tracer technique, constraints on can be pushed down to . Amongst the general relativistic effects, the Doppler term is detectable with the multi-tracer. The Sachs-Wolfe terms and the integrated SW effect are still not detectable.
9 pages, 7 figures, 2 tables, version accepted by MNRAS
References in corpus (15)
- Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
- Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
- Measuring primordial non-gaussianity without cosmic variance
- Late-time cosmology with 21cm intensity mapping experiments
- Cosmology with the SPHEREX All-Sky Spectral Survey
- Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
- Line-Intensity Mapping: 2017 Status Report
- Blind foreground subtraction for intensity mapping experiments
- Einstein's legacy in galaxy surveys
- Carbon Monoxide Intensity Mapping at Moderate Redshifts
- Cosmology with intensity mapping techniques using atomic and molecular lines
- MeerKLASS: MeerKAT Large Area Synoptic Survey
- Measuring Galaxy Clustering and the Evolution of [CII] Mean Intensity with far-IR Line Intensity Mapping During 0.5 < z < 1.5
- Probing the primordial Universe with MeerKAT and DES
- Tomographic Intensity Mapping versus Galaxy Surveys: Observing the Universe in H-alpha emission with new generation instruments
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- Non-Gaussianity Constraints using Future Radio Continuum Surveys and the Multi-Tracer Technique
- Cosmological constraints from line intensity mapping with interlopers
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- Local primordial non-Gaussianity in the relativistic galaxy bispectrum
- Canceling out intensity mapping foregrounds
- Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
- Constraints on the growth rate using the observed galaxy power spectrum
- Constraining the growth rate by combining multiple future surveys
- The local PNG bias of neutral Hydrogen,
- Multipoles of the relativistic galaxy bispectrum
- Measuring ISW with next-generation radio surveys
- Apparent parity violation in the observed galaxy trispectrum
- Anti-symmetric clustering signals in the observed power spectrum
- Decoupling Local Primordial non-Gaussianity from Relativistic Effects in the Galaxy Bispectrum
- Constraining primordial non-Gaussianity by combining photometric galaxy and 21cm intensity mapping surveys
- A wide-angle formulation of foreground filters for HI intensity mapping
- Mapping Large-Scale-Structure Evolution over Cosmic Times
- Testing General Relativity with Cosmological Large Scale Structure
- Multi-wavelength spectroscopic probes: prospects for primordial non-Gaussianity and relativistic effects
- Exploring future synergies for large-scale structure between gravitational waves and radio sources
- Primordial non-Gaussianity systematics from redshift mismatch with SPHEREx