[O III] EMISSION AND GAS KINEMATICS IN A LYMAN-ALPHA BLOB AT<i>z</i>∼ 3.1
Bibliographic record
Abstract
We present spectroscopic measurements of the [O iii ] emission line from two subregions of strong Lyα emission in a radio-quiet Lyman-alpha blob (LAB). The blob under study is LAB1 at z ∼ 3.1, and the [O iii ] detections are from the two Lyman break galaxies (LBGs) embedded in the blob halo. The [O iii ] measurements were made with LUCIFER on the 8.4 m Large Binocular Telescope and NIRSPEC on 10 m Keck Telescope. Comparing the redshift of the [O iii ] measurements to Lyα redshifts from SAURON allows us to take a step toward understanding the kinematics of the gas in the blob. Using both LUCIFER and NIRSPEC we find velocity offsets between the [O iii ] and Lyα redshifts that are modestly negative or consistent with 0 km s −1 in both subregions studied (ranging from −72 ± 42– + 6 ± 33 km s −1 ). A negative offset means Lyα is blueshifted with respect to [O iii ] a positive offset then implies Lyα is redshifted with respect to [O iii ]. These results may imply that outflows are not primarily responsible for Lyman alpha escape in this LAB, since outflows are generally expected to produce a positive velocity offset. In addition, we present an [O iii ] line flux upper limit on a third region of LAB1, a region that is unassociated with any underlying galaxy. We find that the [O iii ] upper limit from the galaxy-unassociated region of the blob is at least 1.4–2.5 times fainter than the [O iii ] flux from one of the LBG-associated regions and has an [O iii ] to Lyα ratio measured at least 1.9–3.4 times smaller than the same ratio measured from one of the LBGs.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".