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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.18171 |
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| _version_ | 1866929731728834560 |
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| author | Correnti, Matteo Annibali, Francesca Bellazzini, Michele Marinelli, Mariarosa Aloisi, Alessandra Cignoni, Michele Tosi, Monica Pascale, Raffaele Cannon, John M. Schisgal, Lila Hunt, Leslie K. Sacchi, Elena Sohn, Sangmo T. |
| author_facet | Correnti, Matteo Annibali, Francesca Bellazzini, Michele Marinelli, Mariarosa Aloisi, Alessandra Cignoni, Michele Tosi, Monica Pascale, Raffaele Cannon, John M. Schisgal, Lila Hunt, Leslie K. Sacchi, Elena Sohn, Sangmo T. |
| contents | We present the results of deep Hubble Space Telescope photometry of the dwarf galaxy DDO 68-C, proposed as possibly associated with the isolated peculiar dwarf DDO 68. The new data resolve for the first time the stars of DDO 68-C down to well below the tip of the Red Giant Branch (RGB), revealing a low mass (M$_{*}$ $\sim$ 1.5 $\times$ 10$^7$ M$_{\odot}$) star forming galaxy with a backbone of old stars. By means of a fully homogeneous analysis and using the RGB tip as a standard candle, we find that DDO 68 and DDO 68-C lie at the same distance from us, within the uncertainties (D = 12.6 $\pm$ 0.3 Mpc and D = 12.7 $\pm$ 0.4 Mpc, respectively), thus confirming that the two dwarfs are physically associated. While paired dwarf galaxies with mutual projected distance similar to DDO 68 and DDO 68-C are not exceptional in the Lynx-Cancer Void where they live, DDO 68 remains a unicum as, in addition to the newly confirmed companion, it records the evidence of at least two other satellites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_18171 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DDO68-C: HST confirms yet another companion of the isolated dwarf galaxy DDO 68 Correnti, Matteo Annibali, Francesca Bellazzini, Michele Marinelli, Mariarosa Aloisi, Alessandra Cignoni, Michele Tosi, Monica Pascale, Raffaele Cannon, John M. Schisgal, Lila Hunt, Leslie K. Sacchi, Elena Sohn, Sangmo T. Astrophysics of Galaxies Solar and Stellar Astrophysics We present the results of deep Hubble Space Telescope photometry of the dwarf galaxy DDO 68-C, proposed as possibly associated with the isolated peculiar dwarf DDO 68. The new data resolve for the first time the stars of DDO 68-C down to well below the tip of the Red Giant Branch (RGB), revealing a low mass (M$_{*}$ $\sim$ 1.5 $\times$ 10$^7$ M$_{\odot}$) star forming galaxy with a backbone of old stars. By means of a fully homogeneous analysis and using the RGB tip as a standard candle, we find that DDO 68 and DDO 68-C lie at the same distance from us, within the uncertainties (D = 12.6 $\pm$ 0.3 Mpc and D = 12.7 $\pm$ 0.4 Mpc, respectively), thus confirming that the two dwarfs are physically associated. While paired dwarf galaxies with mutual projected distance similar to DDO 68 and DDO 68-C are not exceptional in the Lynx-Cancer Void where they live, DDO 68 remains a unicum as, in addition to the newly confirmed companion, it records the evidence of at least two other satellites. |
| title | DDO68-C: HST confirms yet another companion of the isolated dwarf galaxy DDO 68 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2502.18171 |