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Low-z Lyα and CGM simulation–observation research

Low-z Lyα and CGM simulation–observation research

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antareep.gogoi

A weekly research-update article tracking low-redshift Lyman-alpha and IGM/CGM simulation-to-observation studies, machine-learning and statistical methods, public code, and galaxy–absorber relations.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-10-20

Ten gas updates: carbon 11,000 times below solar, an 18-parameter Lyα-forest model compressed to six, and a recombination sink overstated by 53 per cent

Ten papers on the step from simulated gas to measured absorbers: a public synthetic-spectrum code, an EFT of the forest compressed from eighteen parameters to six, a large-scale correlation that two sightlines can swing, and the most carbon-poor damped absorber yet measured.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-10-13

Twelve gas-census updates: 17 to 28 per cent of the baryons inside halos, a WHIM tracer excess of 2.6, and two 21-cm absorbers 0.035 apart in redshift

Twelve papers turn on one step, the conversion between what an instrument records and the quantity a model predicts, and this issue reads the week's new low-redshift absorption, baryon-budget and spectral-emulation results for how far that step moves the answer.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-10-06

Eleven CGM updates: an observed clumping factor at least eight times the simulated one, damped absorbers that shift 40 per cent with the ionisation model, and a Lyα forest inside a z ≈ 7.57 galaxy

Eleven papers show what the ionisation model, the resolution and the sample threshold decide before a simulated absorber statistic can be set against a measured one, from a clumping factor at least eight times below what the observed quasar nebulae require to a Lyα forest seen inside a galaxy at z = 7.57.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-09-29

Eleven absorber updates: a 0.95 Å completeness floor, a galaxy–forest peak 10 cMpc inside the measured one, and a U-Net whose every confident error sits near a damped absorber

Eleven papers show what each measurement's own sample size and detection threshold decide before a simulation can be measured against it, from a sodium survey that can claim only half its absorbers above 0.95 Å to a mock galaxy–forest correlation whose peak sits 10 cMpc inside the observed one.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-09-22

Ten halo-gas updates: a 0.5% X-ray filling factor, kSZ gas fractions, where the Lyα forest goes dark, and a WHIM fraction cut by more than half

Ten papers show how much of a halo's gas each probe actually reaches, from an X-ray filling factor of half a per cent to a warm-hot fraction that halves once the grid resolves the gas, and which observed values survive the correction.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-09-15

Eight absorber updates: synthetic outflow spectra, C IV infilling, TNG100 oxygen, COLIBRE pressures, and an M31 halo search

Eight papers show how the aperture, the ionising background, the ionisation mechanism and the tracer weighting sit between simulated gas and an inferred quantity, and which observed values survive that sensitivity.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-09-08

Five absorber updates: RHD line matching, CGM winds, Na I flows, SpenderQ, and IFU geometry

Five papers show how profile matching, feedback choices, flow classification, continuum reconstruction, and IFU geometry shape absorber comparisons before the final physical inference.

Low-z Lyα and CGM simulation–observation research
Low-z Lyα and CGM simulation–observation research
2026-09-01

Synthetic absorption spectra to real absorbers: low-z Lyα, CGM, and ML methods

This first issue maps the simulation-to-observation bridge across low-z Lyα and CGM studies. It covers FLAME, Simba and Auriga comparisons, SALSA, CNN and random-forest methods, UV-background systematics, and public code links, while labeling broader-redshift and synthetic-only results clearly.

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