Lensing contribution to the 21 cm intensity bispectrum
| Autor: | Roy Maartens, Rahul Kothari |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences General Relativity and Quantum Cosmology Intensity (physics) Gravitational lens Physics::Space Physics 0103 physical sciences 010303 astronomy & astrophysics Bispectrum Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Classical and Quantum Gravity. 38:095013 |
| ISSN: | 1361-6382 0264-9381 |
| DOI: | 10.1088/1361-6382/abf1c1 |
| Popis: | Intensity maps of the 21cm emission line of neutral hydrogen are lensed by intervening large-scale structure, similar to the lensing of the cosmic microwave background temperature map. We extend previous work by calculating the lensing contribution to the full-sky 21cm bispectrum in redshift space. The lensing contribution tends to peak when equal-redshift fluctuations are lensed by a lower redshift fluctuation. At high redshift, lensing effects can become comparable to the contributions from density and redshift-space distortions. Comment: 8 pages + 2 appendices + references. Version accepted by Class. Quant. Grav |
| Databáze: | OpenAIRE |
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