Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies Beyond the Local Group: Pavo, Corvus A, and Kamino
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arXiv
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| Natura: | Preprint |
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2025
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| author | Mutlu-Pakdil, Burçin Jones, Michael G. Sand, David J. Crnojević, Denija Herron, Kai Strader, Jay Zaritsky, Dennis Bennet, Paul Drlica-Wagner, Alex Casey, Quinn O. Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Hunter, Laura C. Peter, Annika H. G. Prabhu, Deepthi S. Spekkens, Kristine |
| author_facet | Mutlu-Pakdil, Burçin Jones, Michael G. Sand, David J. Crnojević, Denija Herron, Kai Strader, Jay Zaritsky, Dennis Bennet, Paul Drlica-Wagner, Alex Casey, Quinn O. Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Hunter, Laura C. Peter, Annika H. G. Prabhu, Deepthi S. Spekkens, Kristine |
| contents | We present new Hubble Space Telescope (HST) imaging of three recently discovered star-forming dwarf galaxies beyond the Local Group: Pavo, Corvus A, and Kamino. The discovery of Kamino is reported here for the first time. They rank among the most isolated faint dwarf galaxies known, hence they provide unique opportunities to study galaxy evolution at the smallest scales, free from environmental effects of more massive galaxies. Our HST data reach $\sim$2-4 magnitudes below the tip of the red giant branch for each dwarf, allowing us to measure their distances, structural properties, and recent star formation histories (SFHs). All three galaxies contain a complex stellar population of young and old stars, and are typical of field galaxies in this mass regime ($M_V=-10.62\pm0.08$ and $D=2.16^{+0.08}_{-0.07}$ Mpc for Pavo, $M_V=-10.91\pm0.10$ and $D=3.34\pm0.11$ Mpc for Corvus A, and $M_V=-12.02\pm0.12$ and $D=6.50^{+0.15}_{-0.11}$ Mpc for Kamino). Our HST-derived SFHs reveal differences among the three dwarfs: Pavo and Kamino show relatively steady, continuous star formation, while Corvus A formed $\sim$$60$% of its stellar mass by 10 Gyr ago. These results align with theoretical predictions of diverse evolutionary pathways for isolated low-mass galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_16307 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies Beyond the Local Group: Pavo, Corvus A, and Kamino Mutlu-Pakdil, Burçin Jones, Michael G. Sand, David J. Crnojević, Denija Herron, Kai Strader, Jay Zaritsky, Dennis Bennet, Paul Drlica-Wagner, Alex Casey, Quinn O. Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Hunter, Laura C. Peter, Annika H. G. Prabhu, Deepthi S. Spekkens, Kristine Astrophysics of Galaxies We present new Hubble Space Telescope (HST) imaging of three recently discovered star-forming dwarf galaxies beyond the Local Group: Pavo, Corvus A, and Kamino. The discovery of Kamino is reported here for the first time. They rank among the most isolated faint dwarf galaxies known, hence they provide unique opportunities to study galaxy evolution at the smallest scales, free from environmental effects of more massive galaxies. Our HST data reach $\sim$2-4 magnitudes below the tip of the red giant branch for each dwarf, allowing us to measure their distances, structural properties, and recent star formation histories (SFHs). All three galaxies contain a complex stellar population of young and old stars, and are typical of field galaxies in this mass regime ($M_V=-10.62\pm0.08$ and $D=2.16^{+0.08}_{-0.07}$ Mpc for Pavo, $M_V=-10.91\pm0.10$ and $D=3.34\pm0.11$ Mpc for Corvus A, and $M_V=-12.02\pm0.12$ and $D=6.50^{+0.15}_{-0.11}$ Mpc for Kamino). Our HST-derived SFHs reveal differences among the three dwarfs: Pavo and Kamino show relatively steady, continuous star formation, while Corvus A formed $\sim$$60$% of its stellar mass by 10 Gyr ago. These results align with theoretical predictions of diverse evolutionary pathways for isolated low-mass galaxies. |
| title | Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies Beyond the Local Group: Pavo, Corvus A, and Kamino |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.16307 |