HST Proper Motion of Andromeda III. Another Satellite Coorbiting the M31 Satellite Plane
Abstract We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr time baseline. The WFPC2 exposures have been processed using a deep-learning centering procedure recently developed as we...
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| Published in | The Astrophysical journal Vol. 975; no. 1; pp. 138 - 147 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
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Philadelphia
The American Astronomical Society
01.11.2024
IOP Publishing |
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| Abstract | Abstract We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr 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 ± 12.5, 47.5 ± 12.5) 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 vir ≥ 1.5 × 10 12 M ⊙ . |
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| AbstractList | Abstract We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr 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 ± 12.5, 47.5 ± 12.5) 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 vir ≥ 1.5 × 10 12 M ⊙ . We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr 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 (μα, μδ) = (−10.5 ± 12.5, 47.5 ± 12.5) μas 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 Mvir ≥ 1.5 × 1012M⊙. We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr 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 ± 12.5, 47.5 ± 12.5) 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 _vir ≥ 1.5 × 10 ^12 M _⊙ . |
| Author | Martone, Max Kanehisa, Kosuke Jamie Platais, Imants Casetti-Dinescu, Dana I. Girard, Terrence M. Petroski, Alexander Pawlowski, Marcel S. Kozhurina-Platais, Vera |
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| SubjectTerms | Aerial surveys Andromeda Galaxy Cameras Galaxies Local Group Proper motion Satellites Space astrometry Stellar motions |
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| Title | HST Proper Motion of Andromeda III. Another Satellite Coorbiting the M31 Satellite Plane |
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