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Revista mexicana de astronomía y astrofísica
versão impressa ISSN 0185-1101
Rev. mex. astron. astrofis vol.47 no.2 Ciudad de México Out. 2011
The Proper Motion of the Large Magellanic Cloud Revisited
M. H. Pedreros1,2
1 Departamento de Física, Facultad de Ciencias, Universidad de Tarapacá, Arica, Casilla 7D, Arica, Chile (mpedrero@uta.cl).
2 Visiting Astronomer, Cerro Tololo InterAmerican Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under cooperative agreement with the National Science Foundation.
Received 2011 March 2
Accepted 2011 June 24
RESUMEN
El movimiento propio (PM) de la Nube Mayor de Magallanes (LMC) relativo a cuatro cuasares en el trasfondo de los respectivos campos, se ha determinado leyendo y reprocesando datos de las imágenes de dos estudios previos. El PM total del centro de masas de la LMC que se obtiene aquí es µ = (+1.94 ± 0.08) mas yr1, con un ángulo de posición de θ = (61.5 ± 3.2)°. Los nuevos resultados concuerdan razonablemente con aquellos obtenidos previamente por nuestro y otros grupos, y con varios modelos teóricos existentes. A partir de la velocidad radial del centro de la LMC obtenida de la literatura, en combinación con el vector velocidad transversal determinado de nuestra medición del PM en este trabajo, obtenemos la velocidad espacial del centro de la LMC. Usando esta ultima y suponiendo un potencial puntual de masa para la Galaxia, hemos estimado la cantidad de masa contenida dentro de 50 kpc desde el centro de la Galaxia.
ABSTRACT
The proper motion (PM) of the Large Magellanic Cloud (LMC) relative to four background quasistellar objects has been determined by reading and reprocessing image data from two previous studies. The total center of mass PM for the LMC obtained here is µ = (+1.94 ± 0.08) mas yr1, with a position angle θ = (61.5 ± 3.2)°. The new results agree reasonably well with those obtained previously by our group and by other groups, and with several existing theoretical % models. From the radial velocity of the center of the LMC found in the literature, in combination with the transverse velocity vector determined from the PM measured in the present work, we obtain the space velocity of the LMC center. Using the latter and assuming a pointmass potential for the Galaxy, we have estimated the amount of mass contained within 50 kpc of the center of the Galaxy.
Key Words: astrometry — proper motions — Magellanic Clouds — quasars: general.
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ACKNOWLEDGMENTS
M.H.P. is greatful of the support by the Universidad de Tarapacá research fund (project # 472109). The author wishes to thank to an anonymous referee for helpful suggestions which improved this paper. It is also a pleasure to thank T. Martínez for helping with data processing.
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