Gone with the wind? Potential gas inflow in the broad-line region of a QSO at z=0.287 traced by time-varying Balmer absorption

arXiv:2609.25224 · astro-ph.GA · Submitted 2026-09-21 · Read on arXiv

astro-ph.GA

Submitted: 2026-09-21

Updated: 2026-09-21

Comments: 30 pages, 20 figures, to be submitted to MNRAS

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

Terminology

• AGN — 61× in this paper · explained in 1 episode
• Core — 21× in this paper · explained in 2 episodes
• Trace — 17× in this paper · explained in 2 episodes
• Abundance — 9× in this paper · explained in 1 episode
• Calibration — 6× in this paper · explained in 7 episodes
• Dust Attenuation — 5× in this paper · explained in 2 episodes
• Dark Energy Spectroscopic Instrument — 2× in this paper
• Metallicity — 2× in this paper · explained in 3 episodes
• National Science Foundation — 2× in this paper
• Active Galactic Nuclei (AGN) — 1× in this paper · explained in 1 episode
• Alignment — 1× in this paper · explained in 1 episode
• Degeneracy — 1× in this paper · explained in 3 episodes
• Follow-up X-ray Telescope — 1× in this paper
• Little Red Dots — 1× in this paper · explained in 2 episodes
• National Institute of Standards and Technology — 1× in this paper
• Quasi-Stellar Object — 1× in this paper
• Robustness — 1× in this paper · explained in 5 episodes
• Velocity Dispersion — 1× in this paper · explained in 2 episodes

Sources

• The Little Blue and Red Dots Rosetta Stones: Non-Gaussian broad lines, hot dust, and X-ray weakness
• SpectRes: A Fast Spectral Resampling Tool in Python
• ABCD: The Nuclear Structure of the Little Red Dots Revealted through Absorption, Break, Continuum, and Decrement
• Irony at z=6.68: a bright AGN with forbidden Fe emission and multi-component Balmer absorption
• The Broad Emission Line Regions of Quasars - current status and future prospects
• Little Red and Blue Dots: AGN-excited narrow lines, Lyman- alpha emission, and resemblance to standard quasars
• JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST
• A direct black hole mass measurement in a Little Red Dot at the Epoch of Reionization
• An (in)complete NIRSpec census of Balmer absorption in Type 1 AGN -- radiation-driven outflows in little red dots, quasars and variable stars
• Challenging the AGN scenario for JWST/NIRSpec LRD and non-LRD broad H$\alpha$ emitters in light of non-detection of NIRCam photometric variability and X-ray
• (LRDs)$^2$: The Low-ReDshift Little Red Dots Survey. II. DESI DR1 Sample
• How I Wonder What You Are -- JWST's Little Red Dots do not TWINKLE
• Counting Little Red Dots at $z<4$ with Ground-based Surveys and Spectroscopic Follow-up
• Little red dots as obscured little blue dots: relative abundances, luminosities, and black-hole masses
• Wings of little dots: Exponential broad lines from a stratified BLR
• The Engine and its Flows: Little Red Dot spectra are shaped by the column densities of their gas envelopes
• A "Black Hole Star" Reveals the Remarkable Gas-Enshrouded Hearts of the Little Red Dots
• Little Red Dots as Intermediate Mass, Super-Eddington Engines: Insights from Type IIn Supernovae and The 1837-1856 Great Eruption of eta Carinae
• A new sample of Little Red Dots at $z<0.45$ in DESI DR1: Broad Balmer lines, low ionization spectrum and no variability
• Little red dots as young supermassive black holes in dense ionized cocoons

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