Deep in the Fields of the Andromeda Halo: Discovery of the Pegasus VII dwarf galaxy in UNIONS
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913690620526592 |
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| author | Smith, Simon E. T. McConnachie, Alan W. Gwyn, Stephen Hayes, Christian R. Gatto, Massimiliano Chambers, Ken Cuillandre, Jean-Charles Hudson, Michael J. Magnier, Eugene Martin, Nicolas Navarro, Julio |
| author_facet | Smith, Simon E. T. McConnachie, Alan W. Gwyn, Stephen Hayes, Christian R. Gatto, Massimiliano Chambers, Ken Cuillandre, Jean-Charles Hudson, Michael J. Magnier, Eugene Martin, Nicolas Navarro, Julio |
| contents | We present the newly discovered dwarf galaxy Pegasus VII (Peg VII), a member of the M31 sub-group which has been uncovered in the $ri$ photometric catalogs from the Ultraviolet Near-Infrared Optical Northern Survey and confirmed with follow-up imaging from both the Canada-France-Hawaii Telescope and the Gemini-North Telescope. This system has an absolute $V$-band magnitude of $-5.7 \pm 0.2$ mag and a physical half-light radius of $177^{+36}_{-34}$ pc, which is characteristic of dynamically-confirmed Milky Way satellite dwarf galaxies and about 5 times more extended than the most extended M31 globular clusters. Peg VII lies at a three-dimensional separation from M31 of $331^{+15}_{-4}$ kpc and a significant elongation ($ε\sim 0.5$) towards the projected direction of M31 could be indicative of a past tidal interaction, but additional investigation into the orbit, star formation history, and whether any gas remains in the galaxy is needed to better understand the evolution of Peg VII. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09792 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Deep in the Fields of the Andromeda Halo: Discovery of the Pegasus VII dwarf galaxy in UNIONS Smith, Simon E. T. McConnachie, Alan W. Gwyn, Stephen Hayes, Christian R. Gatto, Massimiliano Chambers, Ken Cuillandre, Jean-Charles Hudson, Michael J. Magnier, Eugene Martin, Nicolas Navarro, Julio Astrophysics of Galaxies We present the newly discovered dwarf galaxy Pegasus VII (Peg VII), a member of the M31 sub-group which has been uncovered in the $ri$ photometric catalogs from the Ultraviolet Near-Infrared Optical Northern Survey and confirmed with follow-up imaging from both the Canada-France-Hawaii Telescope and the Gemini-North Telescope. This system has an absolute $V$-band magnitude of $-5.7 \pm 0.2$ mag and a physical half-light radius of $177^{+36}_{-34}$ pc, which is characteristic of dynamically-confirmed Milky Way satellite dwarf galaxies and about 5 times more extended than the most extended M31 globular clusters. Peg VII lies at a three-dimensional separation from M31 of $331^{+15}_{-4}$ kpc and a significant elongation ($ε\sim 0.5$) towards the projected direction of M31 could be indicative of a past tidal interaction, but additional investigation into the orbit, star formation history, and whether any gas remains in the galaxy is needed to better understand the evolution of Peg VII. |
| title | Deep in the Fields of the Andromeda Halo: Discovery of the Pegasus VII dwarf galaxy in UNIONS |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.09792 |