<?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>S0185-11012018000100017</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Is HH 47 Slowing down?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez]]></surname>
<given-names><![CDATA[P. F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Space Telescope Science Institute  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>54</volume>
<numero>1</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012018000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012018000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012018000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We have used three epochs of red [S II] and H&#945; Hubble Space Telescope (HST) archival images of HH 47 to determine the proper motion velocities of the knots along the jet. With the three available epochs we compute two sets of proper motions (one using the first two epochs, and the second one using the last two epochs). Somewhat surprisingly, we find that the [S II] proper motion velocities show a significant decrease as a function of increasing time. The knots present decelerations of up to &#8776; 50% over the 14 years covered by the three epochs of HST images. This rather dramatic effect might be a result of a variable ejection direction (which would be consistent with the sinuous morphology of the HH 47 jet), leading to the direct interaction of the knots with the surrounding environment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Hemos usado tres épocas de imágenes de las lineas rojas de [S II] y de H&#945; del archivo del telescopio espacial Hubble (HST) del objeto HH 47 para determinar las velocidades de movimiento propio de los nudos a lo largo del chorro. Con las tres épocas disponibles, determinamos dos conjuntos de movimientos propios (uno usando las dos primeras épocas, y el otro usando las dos últimas). Sorprendentemente, encontramos que las velocidades obtenidas para [S II] muestran un descenso significativo en función del tiempo. Los nudos muestran deceleraciones de hasta &#8776; 50% en los 14 años cubiertos por las tres épocas de imágenes del HST. Este dramático efecto podría ser el resultado de una dirección de eyección variable (que podría ser consistente con la morfología sinuosa del chorro de HH 47), lo que conduce a una interacción directa de los nudos con el medio ambiente circundante.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Herbig-Haro objects]]></kwd>
<kwd lng="en"><![CDATA[ISM: jets and outflows]]></kwd>
<kwd lng="en"><![CDATA[ISM: individual objects (HH 47)]]></kwd>
<kwd lng="en"><![CDATA[stars: formation]]></kwd>
<kwd lng="en"><![CDATA[stars: winds]]></kwd>
<kwd lng="en"><![CDATA[outflows]]></kwd>
</kwd-group>
</article-meta>
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