HIGH-VELOCITY H I IS NOT ASSOCIATED WITH THE TeV SUPERNOVA REMNANT W51C
Bibliographic record
Abstract
The recently detected TeV γ-ray source HESS J1923+141 coincides with supernova remnant (SNR) W51C and the star-forming region W51B of the W51 complex. We construct H i absorption spectra of SNR W51C, H ii regions G49.2−0.35 and G49.1−0.38 in W51B, and a nearby compact extragalactic source. Our study detects high-velocity (HV) H i clouds (above 83 km s −1 ) that coincide with W51B, but finds that the clouds are behind W51B. Both W51C and G49.2−0.35 have similar highest velocity absorption features at ∼70 km s −1 . The H ii region G49.1−0.38 is behind the SNR because its H i absorption spectrum has a feature at 83 km s −1 . These new results argue against previous claims that the SNR has shocked the HV H i clouds. Therefore, the TeV emission from the complex should not be associated with the HV H i clouds. W51C has a distance of about 4.3 kpc, smaller than the tangent point distance of 5.5 kpc in that direction, but still in the Sagittarius spiral arm.
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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 | 0.001 |
| 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".