Proper motion study of the Magellanic Clouds using SPM material

Details Proper motion study of the Magellanic Clouds using SPM material Proper motion study of the Magellanic Clouds using SPM material

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..40..106v&link_type=abstract

XIII Latin American Regional IAU Meeting (Eds. W. J. Henney & S. Torres-Peimbert) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Astrometry, Catalogs, Magellanic Clouds, Proper Motions

Scientific paper

Absolute proper motions are determined for stars and galaxies to V = 17.5 over a 450 square-degree area that encloses both Magellanic Clouds. The proper motions are based on photographic and CCD observations of the Yale/San Juan Southern Proper Motion program. Multiple, local relative proper motion measures are combined in an overlap solution using photometrically selected Galactic disk stars to define a global relative system that is then transformed to absolute using external galaxies and Hipparcos stars to tie into the ICRS. The resulting catalog of 1.4 million objects is used to derive the mean absolute proper motions of the Large Magellanic Cloud and the Small Magellanic Cloud; (μ_{α} cos δ, μ_{δ})_{LMC} = (+1.89,+0.39)±(0.27,0.27) mas yr^{-1} and (μ_{α} cos δ, μ_{δ})_{SMC} = (+ 0.98,-1.10)±(0.30,0.29) mas yr^{-1}. These mean motions are based on best-measured samples of 3822 LMC stars and 964 SMC stars. A more precise determination can be 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 combined with measurements of the proper motion of the LMC taken from the literature to produce new absolute proper motion determinations for the SMC, as well as an estimate of the total velocity difference of the two clouds to within 54 km s^{-1}.

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