AtLAST -- Cosmology with submillimetre galaxies magnification bias
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Bonavera, Laura Gonzalez-Nuevo, Joaquin Cano, Juan Alberto Crespo, David Fernández-Fernández, Rebeca Franco, Valentina Cueli, Marcos M. Casas, José Manuel Mroczkowski, Tony Ciccone, Caludia Migliaccio, Marina Hatziminaoglou, Evanthia Messias, Hugo |
| author_facet | Bonavera, Laura Gonzalez-Nuevo, Joaquin Cano, Juan Alberto Crespo, David Fernández-Fernández, Rebeca Franco, Valentina Cueli, Marcos M. Casas, José Manuel Mroczkowski, Tony Ciccone, Caludia Migliaccio, Marina Hatziminaoglou, Evanthia Messias, Hugo |
| contents | Magnification bias offers a uniquely powerful and independent route to cosmological information. As a gravitational-lensing observable, it probes galaxy-matter correlations without relying on galaxy shapes, PSF modelling, or intrinsic-alignment corrections. Its sensitivity spans both geometry and growth: magnification bias simultaneously responds to the matter density, the amplitude of structure, and the redshift evolution of dark energy (DE) below $z \leq 1$. Importantly, its parameter degeneracy directions differ from those of shear, Baryon Acoustic Oscillations (BAO), and Cosmic Microwave Background (CMB) data, making it a complementary and consistency-check probe with substantial diagnostic value for the next decade of precision cosmology. However, the current potential of magnification bias is restricted by limited sky coverage, catalogue inhomogeneities, and insufficiently precise redshift or number-count characterisation. A next-generation wide-field submillimetre facility like AtLAST -- capable of uniform, deep surveys and spectroscopic mapping -- would overcome these limitations and transform magnification bias into a competitive, high-precision cosmological tool. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_13894 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | AtLAST -- Cosmology with submillimetre galaxies magnification bias Bonavera, Laura Gonzalez-Nuevo, Joaquin Cano, Juan Alberto Crespo, David Fernández-Fernández, Rebeca Franco, Valentina Cueli, Marcos M. Casas, José Manuel Mroczkowski, Tony Ciccone, Caludia Migliaccio, Marina Hatziminaoglou, Evanthia Messias, Hugo Cosmology and Nongalactic Astrophysics Magnification bias offers a uniquely powerful and independent route to cosmological information. As a gravitational-lensing observable, it probes galaxy-matter correlations without relying on galaxy shapes, PSF modelling, or intrinsic-alignment corrections. Its sensitivity spans both geometry and growth: magnification bias simultaneously responds to the matter density, the amplitude of structure, and the redshift evolution of dark energy (DE) below $z \leq 1$. Importantly, its parameter degeneracy directions differ from those of shear, Baryon Acoustic Oscillations (BAO), and Cosmic Microwave Background (CMB) data, making it a complementary and consistency-check probe with substantial diagnostic value for the next decade of precision cosmology. However, the current potential of magnification bias is restricted by limited sky coverage, catalogue inhomogeneities, and insufficiently precise redshift or number-count characterisation. A next-generation wide-field submillimetre facility like AtLAST -- capable of uniform, deep surveys and spectroscopic mapping -- would overcome these limitations and transform magnification bias into a competitive, high-precision cosmological tool. |
| title | AtLAST -- Cosmology with submillimetre galaxies magnification bias |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.13894 |