Stellar populations in the Local Group starburst galaxy IC10
Bibliographic record
Abstract
The galaxies of the Local Group (LG) are located within 1 Mpc and they can be resolved into stars. These systems are important laboratories both to provide firm constraints on cosmological parameter, like the dark matter, and to investigate galaxy formation and stellar evolution. In particular, the study of the gas rich dwarf Irregular (dIrr) galaxies allows us to investigate the formation of stars in a different environment. In this contest, IC10 is a very interesting object. In fact, it is a dIrr and it is the only starburst galaxy of the LG. Both reddening and distance estimates for this galaxy are uncertain, due to its position and the extension of IC10 is not well known. This PhD project is focused on a photometric study of this galaxy. I have combined accurate and deep optical data collected with the Advanced Camera for Surveys and with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. Moreover, I have used accurate and deep optical data collected with the Suprime-Cam of the Subaru Telescope and with the MegaCam of the Canada France Hawaii Telescope. The high resolution of space data combined with the wide field of the ground-based data allowed me to determine distance and reddening of this object. I have found a true distance modulus of μ = 24.60±0.15 mag. Moreover, I have found evidence of differential reddening (E(B − V ) = 0.78 ± 0.06 mag in the burst region and E(B−V ) = 0.63±0.09 mag in the no-burst region). I have investigated the stellar content of IC10. There is evidence of age and metallicity spread. The study of the Helium burning regions displayed the presence of both old and intermediate-age stars. Star counts across both the starburst and the nostarburst regions suggest the occurrence of IC10 stars within 40 arcminutes. This evidence suggests that IC10 is six time more extent than what thought. From the selection of the stars of IC10 I have determined the luminosity within a diameter of 13arcminutes (LV = 5.88x107L) and a mass-to-luminosity ratio of M/L ∼ 10.5M/L. It is a factor of seven larger than the previous values. This suggests that IC10 is a dark matter dominated syste.
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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 | 0.000 | 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) | 0.002 | 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".