| Texto completo | |
| Autor(es): |
Kolesnikov, I
;
Sampaio, V. M.
;
de Carvalho, R. R.
;
Conselice, C.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 539, n. 3, p. 15-pg., 2025-05-01. |
| Resumo | |
Morphological classification of galaxies becomes increasingly challenging with redshift. We apply a hybrid unsupervised-supervised method to classify similar to 14000 galaxies in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey fields at 0.2 <= z <= 2.4 into spheroid, disc, and irregular systems. Unlike previous works, our method is applied to redshift bins of width 0.2. Comparison between general versus bin-specific models applied to a wide redshift range and reveals significant differences in galaxy morphology beyond z>1 and a consistent similar to 25 per cent disagreement. This suggests that using a single model across wide redshift ranges may introduce biases due to the large time intervals involved compared to galaxy evolution time-scales. Using the ferengi code to assess the impact of cosmological effects, we find that flux dimming and smaller angular scales may lead to the misclassification of up to 18 per cent of disc galaxies as spheroids or irregulars. Contrary to previous studies, we find an almost constant fraction of discs (similar to 60 per cent) and spheroids (similar to 30 per cent) across redshifts. We attribute discrepancies with earlier works, which suggested a decreasing fraction of discs beyond z=1, to the biases introduced by visual classification. Our claim is further strengthened by the striking agreement to the results reported by Lee et al. using an objective, unsupervised method applied to JWST data. Exploring mass dependence, we observe an similar to 40 per cent increase in the fraction of massive (M-stellar >= 10(10.5 )M(circle dot)) spheroids with decreasing redshift, well balanced with a decrease of similar to 20 per cent in the fraction of M-stellar >= 10(10.5 )discs, suggesting that merging massive disc galaxies may form spheroidal systems. (AU) | |
| Processo FAPESP: | 20/16243-3 - Investigando efeitos ambientais na evolução de galáxias: de simulações cosmológicas a observações |
| Beneficiário: | Vitor Medeiros Sampaio |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 20/15245-2 - Espectrógrafo multi-objeto (MOSAIC) para o extremely large telescope: espectroscopia de populações estelares na via láctea e em galáxias |
| Beneficiário: | Beatriz Leonor Silveira Barbuy |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |