Confronting cosmic shear astrophysical uncertainties: DES Year 3 revisited
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Bigwood, Leah McCullough, Jamie Siegel, Jared Amon, Alexandra Efstathiou, George Sanchez-Cid, David Legnani, Elisa Gruen, Daniel Blazek, Jonathan Doux, Cyrille Rosell, Aurelio Carnero Gatti, Marco Huff, Eric MacCrann, Niall Porredon, Anna Marti, Judit Prat Santos, Marcelle Soares dos Myles, Justin Samuroff, Simon Yamamoto, Masaya Yin, Boyan Zuntz, Joe |
| author_facet | Bigwood, Leah McCullough, Jamie Siegel, Jared Amon, Alexandra Efstathiou, George Sanchez-Cid, David Legnani, Elisa Gruen, Daniel Blazek, Jonathan Doux, Cyrille Rosell, Aurelio Carnero Gatti, Marco Huff, Eric MacCrann, Niall Porredon, Anna Marti, Judit Prat Santos, Marcelle Soares dos Myles, Justin Samuroff, Simon Yamamoto, Masaya Yin, Boyan Zuntz, Joe |
| contents | Cosmology from weak gravitational lensing has been limited by astrophysical uncertainties in baryonic feedback and intrinsic alignments. By calibrating these effects using external data, we recover non-linear information, achieving a 2% constraint on the clustering amplitude, $S_8$, resulting in a factor of two improvement on the $Λ$CDM constraints relative to the fiducial Dark Energy Survey Year 3 model. The posterior, $S_8=0.832^{+0.013}_{-0.017}$, shifts by $1.5σ$ to higher values, in closer agreement with the cosmic microwave background result for the standard six-parameter $Λ$CDM cosmology. Our approach uses a star-forming 'blue' galaxy sample with intrinsic alignment model parameters calibrated by direct spectroscopic measurements, together with a baryonic feedback model informed by observations of X-ray gas fractions and kinematic Sunyaev-Zel'dovich effect profiles that span a wide range in halo mass and redshift. Our results provide a blueprint for next-generation surveys: leveraging galaxy properties to control intrinsic alignments and external gas probes to calibrate feedback, unlocking a substantial improvement in the precision of weak lensing surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_04209 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Confronting cosmic shear astrophysical uncertainties: DES Year 3 revisited Bigwood, Leah McCullough, Jamie Siegel, Jared Amon, Alexandra Efstathiou, George Sanchez-Cid, David Legnani, Elisa Gruen, Daniel Blazek, Jonathan Doux, Cyrille Rosell, Aurelio Carnero Gatti, Marco Huff, Eric MacCrann, Niall Porredon, Anna Marti, Judit Prat Santos, Marcelle Soares dos Myles, Justin Samuroff, Simon Yamamoto, Masaya Yin, Boyan Zuntz, Joe Cosmology and Nongalactic Astrophysics Cosmology from weak gravitational lensing has been limited by astrophysical uncertainties in baryonic feedback and intrinsic alignments. By calibrating these effects using external data, we recover non-linear information, achieving a 2% constraint on the clustering amplitude, $S_8$, resulting in a factor of two improvement on the $Λ$CDM constraints relative to the fiducial Dark Energy Survey Year 3 model. The posterior, $S_8=0.832^{+0.013}_{-0.017}$, shifts by $1.5σ$ to higher values, in closer agreement with the cosmic microwave background result for the standard six-parameter $Λ$CDM cosmology. Our approach uses a star-forming 'blue' galaxy sample with intrinsic alignment model parameters calibrated by direct spectroscopic measurements, together with a baryonic feedback model informed by observations of X-ray gas fractions and kinematic Sunyaev-Zel'dovich effect profiles that span a wide range in halo mass and redshift. Our results provide a blueprint for next-generation surveys: leveraging galaxy properties to control intrinsic alignments and external gas probes to calibrate feedback, unlocking a substantial improvement in the precision of weak lensing surveys. |
| title | Confronting cosmic shear astrophysical uncertainties: DES Year 3 revisited |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.04209 |