Impact of ultraviolet radiation from giant spirals on the evolution of dwarf galaxies
Bibliographic record
Abstract
We show that ultraviolet (UV) radiation, with wavelengths shorter than 2000 Å, escaping from the discs of giant spirals could be one of the principal factors affecting the evolution of low-mass satellite galaxies. We demonstrate, using an analytical approach, that the Lyman continuum part of the radiation field can lead to the ionization of the interstellar medium (ISM) of dwarf galaxies through the process of photoevaporation, making the ISM virtually unobservable. The far-ultraviolet part (912 < λ < 2000 Å) is shown to dominate over the internal sources of radiation for most of the Galactic dwarf spheroidals. The proposed environmental factor could be at least partially responsible for the bifurcation of the low-mass protogalaxies into two sequences: dwarf irregulars and dwarf spheroidals. We discuss many peculiarities of the Local Group early-type dwarfs, which can be accounted for by the impact of the UV radiation from the host spiral galaxy (Milky Way or M31).
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".