Lensing contribution to the 21 cm intensity bispectrum
نویسندگان
چکیده
Intensity maps of the 21cm emission line neutral hydrogen are lensed by intervening large-scale structure, similar to lensing cosmic microwave background temperature map. We extend previous work calculating contribution full-sky bispectrum in redshift space. The tends peak when equal-redshift fluctuations a lower fluctuation. At high redshift, effects can become comparable contributions from density and redshift-space distortions.
منابع مشابه
Lensing Reconstruction Using Redshifted 21 Cm Fluctuations
We investigate the potential of second generation measurements of redshifted 21 cm radiation from the epoch of reionization (EOR) to reconstruct the matter density fluctuations along the line of sight. To do so we generalize the quadratic methods developed for the Cosmic Microwave Background (CMB) to 21 cm fluctuations. The three dimensional signal can be analyzed into a finite number of line o...
متن کاملPrecision of diffuse 21-cm lensing
We study the limits of accuracy for weak lensing maps of dark matter using diffuse 21-cm radiation from the pre-reionization epoch using simulations. We improve on previous “optimal” quadratic lensing estimators by using shear and convergence instead of deflection angles. We find that non-Gaussianity provides a limit to the accuracy of weak lensing reconstruction, even if instrumental noise is ...
متن کاملWeak Gravitational Lensing Bispectrum
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters which govern them. The non-linear evolution of large scale structure produces a non-Gaussian signal which is potentially observable in galaxy shear data. We study the threepoint statistics of the convergence, specifically the bispectrum, using the dark matter halo app...
متن کاملLensing of 21-cm fluctuations by primordial gravitational waves.
Weak-gravitational-lensing distortions to the intensity pattern of 21-cm radiation from the dark ages can be decomposed geometrically into curl and curl-free components. Lensing by primordial gravitational waves induces a curl component, while the contribution from lensing by density fluctuations is strongly suppressed. Angular fluctuations in the 21-cm background extend to very small angular s...
متن کاملWeak Gravitational Lensing of High-redshift 21 Cm Power Spectra
We describe the effects of weak gravitational lensing by cosmological large scale structure on the diffuse emission of 21 centimeter radiation from neutral hydrogen at high redshifts during the era of reionization. The ability to observe radial information through the frequency, and thus threedimensional regions of the background radiation at different redshifts, suggests that 21 cm studies may...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2021
ISSN: ['1361-6382', '0264-9381']
DOI: https://doi.org/10.1088/1361-6382/abf1c1