New views in the ultraviolet of the Andromeda galaxy enabled by the AstroSAT/UVIT telescope
Bibliographic record
Abstract
The UVIT instrument on AstroSat has carried out a survey of our neighboring Andromeda galaxy, with a set of 19 fields to cover its large angular extent. The survey is complete in the FUV F148W filter, and about halfcomplete in FUV F169M, FUV F172M, NUV N219M and NUV N279N filters. The NUV coverage is incomplete due to failure of the NUV detector partway through the AstroSat mission. The survey and its scientific results are reviewed, with emphasis on the most recent results. From the Andromeda survey, catalogs of point sources in the FUV and NUV filters have been created. Young stars have been detected in the bulge. FUV and NUV counterparts of the X-ray sources in Andromeda were identified and are predominantly globular clusters. Clusters from the HST/Pan-Andromeda Hubble Treasury (PHAT), which covers a large part of the NE half of the galaxy, have been identified in UVIT FUV and NUV and characterized using their multi-band FUV to IR photometry. FUV variable stars have been identified in Andromeda observations with exposures separated by a few years, and cross-matched with hot stars. The Andromeda bulge has been characterized in FUV and NUV wavelengths for the first time, including measurement of structural parameters and modelling of the star formation and metallicity history of the bulge.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".