A Lyα HALO AROUND A QUASAR AT REDSHIFT<i>z</i>= 6.4
Bibliographic record
Abstract
We present long-slit spectroscopic data that reveal extended Lyα emission around the z = 6.417 radio-quiet quasar CFHQS J2329−0301. The Lyα emission is extended over 15 kpc and has a luminosity of >8 × 10 36 W, comparable to the most luminous Lyα halos known. The emission has complex kinematics, in part due to foreground absorption, which only partly covers the extended nebula. The velocity ranges from −500 km s −1 to +500 km s −1 , with a peak remarkably close to the systemic velocity identified by broad Mg ii emission of the quasar. There is no evidence for infall or outflow of the halo gas. We speculate that the Lyα emission mechanism is recombination after quasar photoionization of gas sitting within a high-mass dark matter halo. The immense Lyα luminosity indicates a higher covering factor of cold gas compared with typical radio-quiet quasars at lower redshift.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".