SEAMLESS Survey: Four Faint Dwarf Galaxies Tracing Low-Mass Galaxy Evolution Across Environments
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Fielder, Catherine E. Jones, Michael G. Sand, David J. Crnojevic, Denija Mutlu-Pakdil, Burcin Bennet, Paul Doliva-Dolinsky, Amandine Donnerstein, Richard Hunter, Laura Congreve Karunakaran, Ananthan Khim, Donghyeon J. Prabhu, Deepthi S. Spekkens, Kristine Zaritsky, Dennis |
| author_facet | Fielder, Catherine E. Jones, Michael G. Sand, David J. Crnojevic, Denija Mutlu-Pakdil, Burcin Bennet, Paul Doliva-Dolinsky, Amandine Donnerstein, Richard Hunter, Laura Congreve Karunakaran, Ananthan Khim, Donghyeon J. Prabhu, Deepthi S. Spekkens, Kristine Zaritsky, Dennis |
| contents | We report on four Local Volume dwarf galaxies identified through our ongoing SEmi-Automated Machine LEarning Search for Semi-resolved galaxies (SEAMLESS): Hydrus A, LEDA 486718, Cetus B, and Sculptor 26, with the discovery of Hydrus A reported here for the first time. These four galaxies span a wide range of environments and evolutionary states. Hydrus A (MV = -9.39+/-0.20, D = 3.38-0.30+0.32 Mpc) and LEDA 486718 (MV = -11.62+/-0.08, D = 4.80+/-0.17 Mpc) are among the most isolated dwarfs known within 5 Mpc, while Cetus B (MV = -8.26+/-0.17, D = 3.32-0.23+0.25 Mpc) and Sculptor 26 (MV = -11.25+/-0.10, D =3.21+/-0.13 Mpc) lie < 2 Rvir of NGC 253. Hydrus A shows properties consistent with quenching driven by cosmic reionization, cosmic-web interactions, or internal feedback. LEDA 486718 is an isolated star forming dwarf. Cetus B appears quenched and morphologically disturbed, making it a low-mass satellite or backsplash candidate, while Sculptor 26 is red and seemingly gas-poor but displays signs of recent activity, consistent with a transitional evolutionary state. Together, these systems demonstrate the power of SEAMLESS for building a census of faint galaxies beyond the Local Group. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_02118 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SEAMLESS Survey: Four Faint Dwarf Galaxies Tracing Low-Mass Galaxy Evolution Across Environments Fielder, Catherine E. Jones, Michael G. Sand, David J. Crnojevic, Denija Mutlu-Pakdil, Burcin Bennet, Paul Doliva-Dolinsky, Amandine Donnerstein, Richard Hunter, Laura Congreve Karunakaran, Ananthan Khim, Donghyeon J. Prabhu, Deepthi S. Spekkens, Kristine Zaritsky, Dennis Astrophysics of Galaxies We report on four Local Volume dwarf galaxies identified through our ongoing SEmi-Automated Machine LEarning Search for Semi-resolved galaxies (SEAMLESS): Hydrus A, LEDA 486718, Cetus B, and Sculptor 26, with the discovery of Hydrus A reported here for the first time. These four galaxies span a wide range of environments and evolutionary states. Hydrus A (MV = -9.39+/-0.20, D = 3.38-0.30+0.32 Mpc) and LEDA 486718 (MV = -11.62+/-0.08, D = 4.80+/-0.17 Mpc) are among the most isolated dwarfs known within 5 Mpc, while Cetus B (MV = -8.26+/-0.17, D = 3.32-0.23+0.25 Mpc) and Sculptor 26 (MV = -11.25+/-0.10, D =3.21+/-0.13 Mpc) lie < 2 Rvir of NGC 253. Hydrus A shows properties consistent with quenching driven by cosmic reionization, cosmic-web interactions, or internal feedback. LEDA 486718 is an isolated star forming dwarf. Cetus B appears quenched and morphologically disturbed, making it a low-mass satellite or backsplash candidate, while Sculptor 26 is red and seemingly gas-poor but displays signs of recent activity, consistent with a transitional evolutionary state. Together, these systems demonstrate the power of SEAMLESS for building a census of faint galaxies beyond the Local Group. |
| title | SEAMLESS Survey: Four Faint Dwarf Galaxies Tracing Low-Mass Galaxy Evolution Across Environments |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.02118 |