Tomographer: End-to-end Redshift Distribution Estimation for Source Catalogs and Intensity Maps

arXiv:2608.03415 · astro-ph.CO, astro-ph.IM · Submitted 2026-08-20 · Read on arXiv

Yi-Kuan Chiang, Yu Voon Ng, Yu-Ren Lin, Manuchehr Taghizadeh-Popp, Brice Ménard

astro-ph.CO, astro-ph.IM

Submitted: 2026-08-20

Updated: 2026-08-21

Comments: submitted to ApJ, 27 pages, 14 figures, code available at https://github.com/yuvoonng/tomographer

Code: https://github.com/yuvoonng/tomographer

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Clustering — 85× in this paper · explained in 2 episodes
• AGN — 9× in this paper · explained in 1 episode
• Core — 6× in this paper · explained in 2 episodes
• Homogeneity — 6× in this paper · explained in 2 episodes
• Trace — 6× in this paper · explained in 2 episodes
• Robustness — 5× in this paper · explained in 5 episodes
• Angular cross-correlation — 3× in this paper · explained in 1 episode
• Calibration — 3× in this paper · explained in 7 episodes
• Accuracy — 2× in this paper · explained in 1 episode
• Aperture — 2× in this paper · explained in 1 episode
• Gravitational Lensing — 2× in this paper · explained in 2 episodes
• Matter Power Spectrum — 2× in this paper · explained in 2 episodes
• Adam — 1× in this paper · explained in 2 episodes
• Computational overhead — 1× in this paper · explained in 2 episodes
• Consistency — 1× in this paper · explained in 3 episodes
• Degeneracy — 1× in this paper · explained in 3 episodes
• Iterative Refinement — 1× in this paper · explained in 3 episodes
• Signal-to-noise ratio (SNR) — 1× in this paper · explained in 2 episodes

Sources

• The Spectroscopic Stage-5 Experiment
• Building a Balanced k-d Tree in O(kn log n) Time
• Unveiling Hidden Lyman Alpha Emitters in the DESI DR1 Data
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Dynamical Test of Cosmic Acceleration: k-nearest Neighbor Cross Correlation of Cosmic Microwave Background and Cosmic Infrared Background
• Tomography of the gamma-ray sky from cross-correlation with DESI DR2 and unWISE galaxies
• Analysis of approximate nearest neighbor searching with clustered point sets
• Clustering-based redshift estimation: method and application to data
• Clustering redshift distribution calibration of weak lensing surveys using the DESI-DR1 spectroscopic dataset
• FLAMINGO: The thermal history of the Universe from tSZ effect cross-correlations and its dependencies on cosmology and baryon physics

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• Dark Energy Survey Year 6 Results: Weak Lensing and Galaxy Clustering Cosmological Analysis Framework
• Exploring the Impact of Systematic Bias in Type Ia Supernova Cosmology Across Diverse Dark Energy Parametrizations
• Non-Gaussian Galaxy Stochasticity and the Noise-Field Formulation