<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012011000200012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Proper Motion of the Large Magellanic Cloud Revisited]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedreros]]></surname>
<given-names><![CDATA[M. H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Tarapacá Facultad de Ciencias Departamento de Física]]></institution>
<addr-line><![CDATA[Arica ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<volume>47</volume>
<numero>2</numero>
<fpage>333</fpage>
<lpage>344</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012011000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012011000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012011000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[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 yr-1, con un ángulo de posición de &#952; = (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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[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 yr-1, with a position angle &#952; = (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 point-mass potential for the Galaxy, we have estimated the amount of mass contained within 50 kpc of the center of the Galaxy.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[astrometry]]></kwd>
<kwd lng="en"><![CDATA[proper motions]]></kwd>
<kwd lng="en"><![CDATA[Magellanic Clouds]]></kwd>
<kwd lng="en"><![CDATA[quasars]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>The Proper Motion of the Large Magellanic Cloud Revisited</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>M. H. Pedreros<sup>1,2</sup></b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Departamento de F&iacute;sica, Facultad de Ciencias, Universidad de Tarapac&aacute;, Arica, Casilla 7&#150;D, Arica, Chile</i> (<a href="mailto:mpedrero@uta.cl">mpedrero@uta.cl</a>).</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Visiting Astronomer, Cerro Tololo Inter&#150;American 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.</i></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Received 2011 March 2    ]]></body>
<body><![CDATA[<br>     Accepted 2011 June 24</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p> 	    <p align="justify"><font face="verdana" size="2">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 im&aacute;genes de dos estudios previos. El PM total del centro de masas de la LMC que se obtiene aqu&iacute; es <i>&micro; </i>= (+1.94 &plusmn; 0.08) mas yr<sup>&#150;1</sup>, con un &aacute;ngulo de posici&oacute;n de <i>&#952;</i> = (61.5 &plusmn; 3.2)&deg;. Los nuevos resultados concuerdan razonablemente con aquellos obtenidos previamente por nuestro y otros grupos, y con varios modelos te&oacute;ricos existentes. A partir de la velocidad radial del centro de la LMC obtenida de la literatura, en combinaci&oacute;n con el vector velocidad transversal determinado de nuestra medici&oacute;n 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.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p> 	    <p align="justify"><font face="verdana" size="2">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 <i>&micro;</i> = (+1.94 &plusmn; 0.08) mas yr<sup>&#150;1</sup>, with a position angle <i>&#952;</i> = (61.5 &plusmn; 3.2)&deg;. 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 point&#150;mass potential for the Galaxy, we have estimated the amount of mass contained within 50 kpc of the center of the Galaxy.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b><i>Key Words:</i></b> astrometry &#8212; proper motions &#8212; Magellanic Clouds &#8212; quasars: general.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmaa/v47n2/v47n2a12.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>ACKNOWLEDGMENTS</b></font></p> 	    <p align="justify"><font face="verdana" size="2">M.H.P. is greatful of the support by the Universidad de Tarapac&aacute; research fund (project # 4721&#150;09). The &#150; author wishes to thank to an anonymous referee for helpful suggestions which improved this paper. It is also a pleasure to thank T. Mart&iacute;nez for helping with data processing.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>REFERENCES</b></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">Anguita, C., Loyola, P., &amp; Pedreros, M. H. 2000, AJ, 120, 845 (ALP00).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7432941&pid=S0185-1101201100020001200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">Costa, E., et al. 2009, AJ, 137, 4339 (CMP09).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7432943&pid=S0185-1101201100020001200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">Drake, A. J., Cook, K. H., Alcock, C., Axelrod, T. S., Geha, M., &amp; MACHO Collaboration 2001, Bull. Am. Astron. Soc., 33, 1379.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7432945&pid=S0185-1101201100020001200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p> 	    ]]></body>
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