| Texto completo | |
| Autor(es): Mostrar menos - |
Barbosa, F. O.
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Chiti, A.
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Limberg, G.
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Pace, A. B.
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Cerny, W.
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Rossi, S.
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Carlin, J. L.
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Stringfellow, G. S.
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Placco, V. M.
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Atzberger, K.
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Carballo-Bello, J. A.
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Chaturvedi, A.
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Choi, Y.
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Crnojevic, D.
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Drlica-Wagner, A.
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Ji, A. P.
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Kallivayalil, N.
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Martinez-Vazquez, C. E.
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Medina, G. E.
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Noel, N. E. D.
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Riley, A. H.
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Sand, D. J.
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Vivas, A. K.
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Bom, C. R.
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Ferguson, P. S.
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Mutlu-Pakdil, B.
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Navabi, M.
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Sakowska, J. D.
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Zenteno, A.
Número total de Autores: 29
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| Tipo de documento: | Artigo Científico |
| Fonte: | ASTROPHYSICAL JOURNAL; v. 993, n. 1, p. 16-pg., 2025-11-01. |
| Resumo | |
The metallicity distribution function (MDF) and internal chemical variations of a galaxy are fundamental to understand its formation and assembly history. In this work, we analyze photometric metallicities for 3883 stars over 7 half-light radii (rh) in the Sculptor (Scl) dwarf spheroidal (dSph) galaxy, using new narrowband imaging data from the Mapping the Ancient Galaxy in CaHK (MAGIC) survey conducted with the Dark Energy Camera (DECam) at the 4 m Blanco Telescope. This work demonstrates the scientific potential of MAGIC using the Scl dSph galaxy, one of the most well-studied satellites of the Milky Way. Our sample ranges from [Fe/H] approximate to -4.0 to [Fe/H] approximate to -0.6, includes six new extremely metal-poor candidates ([Fe/H] <= -3.0), and is almost 3 times larger than the largest spectroscopic metallicity data set in the Scl dSph. Our spatially unbiased sample of metallicities provides a more accurate representation of the MDF, revealing a more metal-rich peak than observed in the most recent spectroscopic sample. It also reveals a break in the metallicity gradient, with a strong change in the slope: from -3.26 +/- 0.18 dex deg-1 for stars inside similar to 1 rh to -0.55 +/- 0.26 dex deg-1 for the outer part of the Scl dSph. Our study demonstrates that combining photometric metallicity analysis with the wide field of view of DECam offers an efficient and unbiased approach for studying the stellar populations of dwarf galaxies in the Local Group. (AU) | |
| Processo FAPESP: | 22/16502-4 - Estruturas do halo Galáctico com estrelas azuis do ramo horizontal |
| Beneficiário: | Fabrícia Oliveira Barbosa |
| 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 |