J-PLUS: Spectral classification and photometric redshifts for 79 million sources in the fourth data release

arXiv:2607.06662 · astro-ph.GA, astro-ph.CO · Submitted 2026-07-07 · Read on arXiv

A. Hernán-Caballero, H. Vázquez Ramió, C. López-Sanjuan, D. Muniesa, T. Civera, J. A. Fernández-Ontiveros, H. Domínguez-Sánchez, A. del Pino, J. A. L. Aguerri, S. Zarattini, V. Marra, A. J. Cenarro, D. Cristóbal-Hornillos, C. Hernández-Monteagudo, A. Marín-Franch, M. Moles, J. Varela, J. Alcaniz, R. A. Dupke, A. Ederoclite, L. Sodré, R. E. Angulo, J. Zaragoza-Cardiel

astro-ph.GA, astro-ph.CO

Submitted: 2026-07-07

Comments: 16 pages, 14 figures, 1 table, 3 appendices. Submitted to A&A

Code: https://github.com/ahc-photoz/coldpress

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

Terminology

• Calibration — 21× in this paper · explained in 7 episodes
• Accuracy — 14× in this paper · explained in 1 episode
• Aperture — 6× in this paper · explained in 1 episode
• Degeneracy — 3× in this paper · explained in 3 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Clustering — 2× in this paper · explained in 2 episodes
• Consistency — 2× in this paper · explained in 3 episodes
• Data Augmentation — 2× in this paper · explained in 7 episodes
• Loss Function — 2× in this paper · explained in 2 episodes
• Point Spread Function — 2× in this paper
• Redundancy — 2× in this paper · explained in 2 episodes
• Robustness — 2× in this paper · explained in 5 episodes
• Activation Function — 1× in this paper · explained in 1 episode
• Core — 1× in this paper · explained in 2 episodes
• Dark Energy Spectroscopic Instrument — 1× in this paper
• Epistemic Uncertainty — 1× in this paper · explained in 9 episodes
• Fidelity — 1× in this paper · explained in 2 episodes
• Gaussian Mixture Model — 1× in this paper
• Gaussian Mixture Model (GMM) — 1× in this paper · explained in 2 episodes
• Homogeneity — 1× in this paper · explained in 2 episodes
• Regularization — 1× in this paper · explained in 3 episodes
• Selection Bias — 1× in this paper · explained in 4 episodes
• Sloan Digital Sky Survey — 1× in this paper
• Spectral Gap — 1× in this paper · explained in 5 episodes
• Table Access Protocol — 1× in this paper
• Virtual Observatory — 1× in this paper

Sources

• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• The Pan-STARRS1 Surveys
• Data Release 1 of the Dark Energy Spectroscopic Instrument

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