First ground-based charge-coupled device proper motions for fornax: II. final results
We present the first entirely ground-based astrometric determination of the proper motion for the Fornax Local Group dwarf spheroidal satellite galaxy of the Milky Way (MW), using charge-coupled device data acquired with the ESO 3.5 m New Technology Telescope at La Silla Observatory in Chile. Our un...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2011 August 16
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| In: |
The astronomical journal
Year: 2011, Jahrgang: 142, Heft: 3, Pages: 1-12 |
| ISSN: | 1538-3881 |
| DOI: | 10.1088/0004-6256/142/3/93 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/0004-6256/142/3/93
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| Verfasserangaben: | René A. Méndez, Edgardo Costa, Carme Gallart, Mario H. Pedreros, Maximiliano Moyano, and Martin Altmann |
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| 100 | 1 | |a Mendez, Rene A. |e VerfasserIn |0 (DE-588)1265606234 |0 (DE-627)1814556850 |4 aut | |
| 245 | 1 | 0 | |a First ground-based charge-coupled device proper motions for fornax |b II. final results |c René A. Méndez, Edgardo Costa, Carme Gallart, Mario H. Pedreros, Maximiliano Moyano, and Martin Altmann |
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| 520 | |a We present the first entirely ground-based astrometric determination of the proper motion for the Fornax Local Group dwarf spheroidal satellite galaxy of the Milky Way (MW), using charge-coupled device data acquired with the ESO 3.5 m New Technology Telescope at La Silla Observatory in Chile. Our unweighted mean from five quasar fields in the background of Fornax, used as fiducial reference points, leads to μαcos δ = 0.62 ± 0.16 mas yr−1 and μδ = −0.53 ± 0.15 mas yr−1. A detailed comparison with all previous measurements of this quantity seems to imply that there is still no convincing convergence to a single value, perhaps indicating the existence of unaccounted systematic effects in (some of) these measurements. From all available proper-motion and radial velocity measurements for Fornax, we compute Fornax's orbital parameters and their uncertainty using a realistic Galactic potential and a Monte Carlo simulation. Properties of the derived orbits are then compared to main star formation episodes in the history of Fornax. All published proper-motion values imply that Fornax has recently (200-300 Myr ago) approached perigalacticon at a distance of ∼150 kpc. However, the derived period exhibits a large scatter, as does the apogalacticon. Our orbit, being the most energetic, implies a very large apogalactic distance of ∼950 kpc. If this were the case, then Fornax would be a representative of a hypervelocity MW satellite in late infall. | ||
| 700 | 1 | |a Costa, Edgardo |e VerfasserIn |4 aut | |
| 700 | 1 | |a Gallart, Carme |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pedreros, Mario H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Moyano, Maximiliano |e VerfasserIn |4 aut | |
| 700 | 1 | |a Altmann, Martin |d 1970- |e VerfasserIn |0 (DE-588)124379680 |0 (DE-627)36330696X |0 (DE-576)294145818 |4 aut | |
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