Spectroscopic Analysis of Fermi-detected Blazars using SDSS-V

arXiv:2607.26175 · astro-ph.HE · Submitted 2026-07-28 · Read on arXiv

Mohammed Iddrisu Nlowie, James Aird, Eli Kasai, Amy L. Rankine, Paloma Guetzoyan, Scott Anderson, Catarina Aydar, William N. Brandt, Joel R. Brownstein, Xinyu Dai, Lorena Hernández-García, Paola Rodríguez Hidalgo, Pranavi Hiremath, Anton Koekemoer, Andrea Merloni, Sean Morrison, Mara Salvato, Donald P. Schneider, Axel Schwope, Benny Trakhtenbrot

astro-ph.HE

Submitted: 2026-07-28

Comments: 34 pages, 17 figures plus appendices. Submitted to MNRAS. Catalogue available as SDSS DR20 Value-Added Catalogue https://www.sdss.org/dr20/data_access/value-added-catalogs/?vac_id=10034 Accompanied visualization python package tool https://github.com/minlowie/Blazar-Analysis-Pipeline

Code: https://github.com/minlowie/Blazar-Analysis-Pipeline

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

Terminology

• AGN — 27× in this paper · explained in 1 episode
• alpha — 15× in this paper · explained in 1 episode
• Accuracy — 11× in this paper · explained in 1 episode
• Sloan Digital Sky Survey — 4× in this paper
• Trace — 3× in this paper · explained in 2 episodes
• Wide-field Infrared Survey Explorer — 3× in this paper
• BL Lac and Flat Spectrum Radio Quasar — 2× in this paper
• Consistency — 2× in this paper · explained in 3 episodes
• Spectral Signature — 2× in this paper · explained in 2 episodes
• Benchmark — 1× in this paper · explained in 2 episodes
• Large Area Telescope — 1× in this paper
• Local Optimization — 1× in this paper · explained in 2 episodes
• SDSS-IV Reverberation Mapping — 1× in this paper

Sources

• Pass 8: Toward the Full Realization of the Fermi-LAT Scientific Potential
• Fermi Large Area Telescope Fourth Source Catalog Data Release 2
• Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
• SpectRes: A Fast Spectral Resampling Tool in Python
• AGN Reddening and Ultraviolet Extinction Curves from Hubble Space Telescope Spectra
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• Classification of a New X-ray Catalog of Likely Counterparts to 4FGL-DR4 Unassociated Gamma-ray Sources Using a Neural Network

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• XRISM Resolve Spectroscopy of GX 5-1: Constraints on Iron Spectral Features in a Luminous Neutron-Star Binary
• SN 1006: A Cosmic Laboratory for Investigating Shock Acceleration Physics
• Neutrino Spectral Pinching in 3D Core-Collapse Supernovae: Late-Time Convergence, Failed-Explosion Signatures, and Viewing-Angle Dispersion