Complex Extended Line Emission in the [CLC]c[/CLC]D Galaxy in Abell 2390
Bibliographic record
Abstract
This paper reports maps of the cD galaxy in the rich z = 0.23 cluster Abell 2390 at UV, [O II], Lyα, and Hα wavelengths. Spatially resolved UV and optical spectra were obtained with Space Telescope Imaging Spectrograph on the Hubble Space Telescope ; the 2'' wide slit was aligned close to the long axis and blue lane of the galaxy and includes all the inner bright features seen in Wide Field Planetary Camera 2 images. The Lyα is seen in emission from several bright knots and over an extended region from 4'' northwest to 2'' southeast of the nucleus. Three of these knots have detected UV continuum as well. Hα images were obtained with OSIS at the Canada-France-Hawaii Telescope; both Hα and [O II] show extended emission that roughly trace Lyα, primarily to the northwest. Notable differences between the spatial distributions of Hα, Lyα, and [O II] emission and the blue knots in the galaxy may be the result of nonhomogeneous dust extinction or variations in ionization. The Lyα emission velocities depend on the uncertain identification with features in the undispersed images; there is strong evidence for resolved emission knots to have high velocities, ≳1000 km s -1 , indicative of infall. The Lyα spectrum shows a sharp cutoff which may be due to absorption; we entertain the possibility that this edge is due to a shell of absorbing gas outflowing at about 5000 km s -1 .
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".