HST Proper Motion of Andromeda III: Another Satellite Co-orbiting The M31 Satellite Plane
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913498688126976 |
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| author | Casetti-Dinescu, Dana I. Pawlowski, Marcel S. Girard, Terrence M. Kanehisa, Kosuke J. Petroski, Alexander Martone, Max Kozhurina-Platais, Vera Platais, Imants |
| author_facet | Casetti-Dinescu, Dana I. Pawlowski, Marcel S. Girard, Terrence M. Kanehisa, Kosuke J. Petroski, Alexander Martone, Max Kozhurina-Platais, Vera Platais, Imants |
| contents | We measure the absolute proper motion of Andromeda III using ACS/WFC and WFPC2 exposures spanning an unprecedented 22-year time baseline. The WFPC2 exposures have been processed using a deep-learning centering procedure recently developed as well as an improved astrometric calibration of the camera. The absolute proper motion zero point is given by 98 galaxies and 16 Gaia EDR3 stars.
The resulting proper motion is $(μ_α , μ_δ) = (-10.5\pm12.5, 47.5\pm12.5)~μ$as yr$^{-1}$. We perform an orbit analysis of And III using two estimates of M31's mass and proper motion. We find that And III's orbit is consistent with dynamical membership to the Great Plane of Andromeda system of satellites although with some looser alignment compared to the previous two satellites NGC 147 and NGC 185. And III is bound to M31 if M31's mass is $M_{\mathrm{vir}}\geq 1.5\times10^{12}\,M_{\odot}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_08252 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | HST Proper Motion of Andromeda III: Another Satellite Co-orbiting The M31 Satellite Plane Casetti-Dinescu, Dana I. Pawlowski, Marcel S. Girard, Terrence M. Kanehisa, Kosuke J. Petroski, Alexander Martone, Max Kozhurina-Platais, Vera Platais, Imants Astrophysics of Galaxies We measure the absolute proper motion of Andromeda III using ACS/WFC and WFPC2 exposures spanning an unprecedented 22-year time baseline. The WFPC2 exposures have been processed using a deep-learning centering procedure recently developed as well as an improved astrometric calibration of the camera. The absolute proper motion zero point is given by 98 galaxies and 16 Gaia EDR3 stars. The resulting proper motion is $(μ_α , μ_δ) = (-10.5\pm12.5, 47.5\pm12.5)~μ$as yr$^{-1}$. We perform an orbit analysis of And III using two estimates of M31's mass and proper motion. We find that And III's orbit is consistent with dynamical membership to the Great Plane of Andromeda system of satellites although with some looser alignment compared to the previous two satellites NGC 147 and NGC 185. And III is bound to M31 if M31's mass is $M_{\mathrm{vir}}\geq 1.5\times10^{12}\,M_{\odot}$. |
| title | HST Proper Motion of Andromeda III: Another Satellite Co-orbiting The M31 Satellite Plane |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.08252 |