Microlensing of Broad Absorption Line Quasars: Polarization Variability
Bibliographic record
Abstract
Roughly 10% of all quasars exhibit broad absorption line (BAL) features which appear to arise in material outflowing at high velocity from the active galactic nucleus. The details of this outflow are, however, very poorly constrained, and the particular nature of the BAL material is essentially unknown. Recently, new clues have become available through polarimetric studies, which have found that BAL troughs are more polarized than the quasar continuum radiation. To explain these observations, researchers have developed models where the BAL material outflows equatorially across the surface of the dusty torus. In these models, however, several sources of the BAL polarization are possible. Here we demonstrate how polarimetric monitoring of gravitationally lensed quasars, such as H1413+117, during microlensing events not only can distinguish between two currently popular models but also can provide further insight into the structure at the cores of BAL quasars.
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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 | 0.001 | 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".