PROPER MOTION OF THE MAGELLANIC CLOUDS USING SPM
Fuente:
Redalyc
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Artículo científico |
| Sprache: | en |
| Veröffentlicht: |
Universidad Nacional Autónoma de México
2014
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1876425585889116160 |
|---|---|
| author | K. Vieira |
| author_facet | K. Vieira |
| contents | PROPER MOTION OF THE MAGELLANIC CLOUDS USING SPM K. Vieira T. Girard W. van Altena N. Zacharias D. Casetti V. Korchagin I. Platais D. Monet C. López Física, Astronomía y Matemáticas Astrometry proper motions Magellanic Clouds Absolute proper motions are determined for stars and galaxies to V = 17 . 5 over a 450 square-degree area that includes the Magellanic Clouds, using photographic and CCD observations of the Yale/ San Juan Southern Proper Motion program. Multiple, local relative proper motion measures w ere combined in an overlap solution using photometrically selected galactic disk stars to define a global relative sy stem that is then transformed to absolute using external galaxies and Hipparcos stars to tie into the ICRS. The resulting catalog is used to derive the mean absolute proper motions of the Magellanic Clouds: ( μ α cos δ, μ δ ) LMC = (+1 . 88 , +0 . 37) ± (0 . 27 , 0 . 27) mas yr − 1 and ( μ α cos δ, μ δ ) SMC = (+1 . 05 , − 1 . 03) ± (0 . 30 , 0 . 29) mas yr − 1 , based on best-measured samples of 3822 LMC stars and 964 SMC stars. A dominant portion of the f ormal errors is due to the estimated uncertainty in the inertial system of the Hipparcos Catalog. A more precise determination was made for the proper motion of the SMC relative to the LMC; ( μ α cos δ , μ δ ) SMC − LMC = ( − 0 . 91 , − 1 . 49) ± (0 . 16 , 0 . 15) mas yr − 1 . This differential value is used to estimate of the total velocity difference of the two clouds to within ± 54 km s − 1 . The absolute proper motion results are consistent with the Clouds’ orbits bei ng marginally bound to the Milky Way, albeit on an elongated orbit. 2014 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57131045014 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.43 |
| format | Artículo científico |
| id | redalyc_57131045014 |
| institution | Redalyc |
| language | en |
| publishDate | 2014 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | PROPER MOTION OF THE MAGELLANIC CLOUDS USING SPM K. Vieira Física, Astronomía y Matemáticas Astrometry proper motions Magellanic Clouds PROPER MOTION OF THE MAGELLANIC CLOUDS USING SPM K. Vieira T. Girard W. van Altena N. Zacharias D. Casetti V. Korchagin I. Platais D. Monet C. López Física, Astronomía y Matemáticas Astrometry proper motions Magellanic Clouds Absolute proper motions are determined for stars and galaxies to V = 17 . 5 over a 450 square-degree area that includes the Magellanic Clouds, using photographic and CCD observations of the Yale/ San Juan Southern Proper Motion program. Multiple, local relative proper motion measures w ere combined in an overlap solution using photometrically selected galactic disk stars to define a global relative sy stem that is then transformed to absolute using external galaxies and Hipparcos stars to tie into the ICRS. The resulting catalog is used to derive the mean absolute proper motions of the Magellanic Clouds: ( μ α cos δ, μ δ ) LMC = (+1 . 88 , +0 . 37) ± (0 . 27 , 0 . 27) mas yr − 1 and ( μ α cos δ, μ δ ) SMC = (+1 . 05 , − 1 . 03) ± (0 . 30 , 0 . 29) mas yr − 1 , based on best-measured samples of 3822 LMC stars and 964 SMC stars. A dominant portion of the f ormal errors is due to the estimated uncertainty in the inertial system of the Hipparcos Catalog. A more precise determination was made for the proper motion of the SMC relative to the LMC; ( μ α cos δ , μ δ ) SMC − LMC = ( − 0 . 91 , − 1 . 49) ± (0 . 16 , 0 . 15) mas yr − 1 . This differential value is used to estimate of the total velocity difference of the two clouds to within ± 54 km s − 1 . The absolute proper motion results are consistent with the Clouds’ orbits bei ng marginally bound to the Milky Way, albeit on an elongated orbit. 2014 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57131045014 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.43 |
| title | PROPER MOTION OF THE MAGELLANIC CLOUDS USING SPM |
| topic | Física, Astronomía y Matemáticas Astrometry proper motions Magellanic Clouds |
| url | https://www.redalyc.org/articulo.oa?id=57131045014 |