There is no single density: star-forming regions and galaxies hold more dense ionized gas than long assumed

arXiv:2607.07973 · astro-ph.GA · Submitted 2026-07-08 · Read on arXiv

J. Eduardo Méndez-Delgado, Christophe Morisset, William J. Henney, Niv Drory, Oleg V. Egorov, Sebastián F. Sánchez, Juna A. Kollmeier, Kathryn Kreckel, Guillermo Blanc, Grażyna Stasińska, Evelyn J. Johnston, Héctor J. Ibarra-Medel, Alfredo J. Mejía-Narváez, César Esteban, Jorge García-Rojas, Amrita Singh, Ivan Yu. Katkov, Evan D. Skillman, Rogelio Orozco-Duarte, Igor A. Zinchenko, Alejandra Z. Lugo-Aranda, Aida Wofford, Simon C. O. Glover, Evgeniya Egorova, Rodolfo de J. Zermeño, Lesly C. Castañeda-Carlos, Fu-Heng Liang, Natascha Sattler, Irene Cruz-González, Joel R. Brownstein, Thomas Hilder, Donald P. Schneider

astro-ph.GA

Submitted: 2026-07-08

Comments: Submitted manuscript; comments welcome

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

Terminology

• Abundance — 30× in this paper · explained in 1 episode
• SDSS-V Local Volume Mapper — 6× in this paper
• Metallicity — 5× in this paper · explained in 3 episodes
• Calibration — 4× in this paper · explained in 7 episodes
• Trace — 3× in this paper · explained in 2 episodes
• Accuracy — 2× in this paper · explained in 1 episode
• Selection Bias — 2× in this paper · explained in 4 episodes
• Aperture — 1× in this paper · explained in 1 episode
• Consistency — 1× in this paper · explained in 3 episodes
• Core — 1× in this paper · explained in 2 episodes
• Fidelity — 1× in this paper · explained in 2 episodes
• Homogeneity — 1× in this paper · explained in 2 episodes
• Inverse Problem — 1× in this paper · explained in 2 episodes
• Physical Constraints — 1× in this paper · explained in 7 episodes

Sources

• SDSS-V LVM: Revealing the Physical and Chemical Structure of the Helix Nebula
• The Sunburst Arc with JWST: III. An Abundance of Direct Chemical Abundances

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