The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy
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2025
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| author | Barbosa, Fabrícia O. Chiti, Anirudh Limberg, Guilherme Pace, Andrew Cerny, William Rossi, Silvia Carlin, Jeffrey L. Stringfellow, Guy Placco, Vinicius Atzberger, Kaia Carballo-Bello, Julio A. Chaturvedi, Astha Choi, Yumi Crnojevic, Denija Drlica-Wagner, Alex Ji, Alexander Kallivayalil, Nitya Martínez-Vázquez, Clara Medina, Gustavo Noel, Noelia Riley, Alexander H. Sand, David Vivas, Kathy Bom, Clecio Ferguson, Peter Mutlu-Pakdil, Burçin Navabi, Mahdieh Sakowska, Joanna Zenteno, Alfredo |
| author_facet | Barbosa, Fabrícia O. Chiti, Anirudh Limberg, Guilherme Pace, Andrew Cerny, William Rossi, Silvia Carlin, Jeffrey L. Stringfellow, Guy Placco, Vinicius Atzberger, Kaia Carballo-Bello, Julio A. Chaturvedi, Astha Choi, Yumi Crnojevic, Denija Drlica-Wagner, Alex Ji, Alexander Kallivayalil, Nitya Martínez-Vázquez, Clara Medina, Gustavo Noel, Noelia Riley, Alexander H. Sand, David Vivas, Kathy Bom, Clecio Ferguson, Peter Mutlu-Pakdil, Burçin Navabi, Mahdieh Sakowska, Joanna Zenteno, Alfredo |
| contents | The metallicity distribution function 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 seven half-light radii ($\rm r_h$) in the Sculptor dwarf spheroidal (Scl dSph) galaxy, using new narrow-band 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 $\rm [Fe/H] \approx - 4.0$ to $\rm [Fe/H] \approx - 0.6$, includes six new extremely metal-poor candidates ($\rm [Fe/H] \leq -3.0$), and is almost three times larger than the largest spectroscopic metallicity dataset in the Scl dSph. Our spatially unbiased sample of metallicities provides a more accurate representation of the metallicity distribution function, 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 $-3.26 \pm 0.18 \rm \ dex/deg$ for stars inside $\sim 1\ \rm r_h$ to $-0.55 \pm 0.26 \rm \ dex/deg$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03593 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy Barbosa, Fabrícia O. Chiti, Anirudh Limberg, Guilherme Pace, Andrew Cerny, William Rossi, Silvia Carlin, Jeffrey L. Stringfellow, Guy Placco, Vinicius Atzberger, Kaia Carballo-Bello, Julio A. Chaturvedi, Astha Choi, Yumi Crnojevic, Denija Drlica-Wagner, Alex Ji, Alexander Kallivayalil, Nitya Martínez-Vázquez, Clara Medina, Gustavo Noel, Noelia Riley, Alexander H. Sand, David Vivas, Kathy Bom, Clecio Ferguson, Peter Mutlu-Pakdil, Burçin Navabi, Mahdieh Sakowska, Joanna Zenteno, Alfredo Astrophysics of Galaxies Solar and Stellar Astrophysics The metallicity distribution function 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 seven half-light radii ($\rm r_h$) in the Sculptor dwarf spheroidal (Scl dSph) galaxy, using new narrow-band 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 $\rm [Fe/H] \approx - 4.0$ to $\rm [Fe/H] \approx - 0.6$, includes six new extremely metal-poor candidates ($\rm [Fe/H] \leq -3.0$), and is almost three times larger than the largest spectroscopic metallicity dataset in the Scl dSph. Our spatially unbiased sample of metallicities provides a more accurate representation of the metallicity distribution function, 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 $-3.26 \pm 0.18 \rm \ dex/deg$ for stars inside $\sim 1\ \rm r_h$ to $-0.55 \pm 0.26 \rm \ dex/deg$ 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. |
| title | The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2504.03593 |