<?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>S0185-11012018000100009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Unveiling the hot molecular core in the ultracompact H II region with extended emission G12.21-0.10]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuente]]></surname>
<given-names><![CDATA[E. de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trinidad]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Porras]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Rico]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araya]]></surname>
<given-names><![CDATA[E. D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kurtz]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hofner]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nigoche-Netro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Universitario de Ciencias Exactas e Ingenierías Instituto de Astronomía y Meteorología Departamento de Física]]></institution>
<addr-line><![CDATA[Guadalajara ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guanajuato Departamento de Astronomía ]]></institution>
<addr-line><![CDATA[ Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Tonantzintla Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Western Illinois University Physics Department ]]></institution>
<addr-line><![CDATA[Macomb IL]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Radioastronomía y Astrofísica ]]></institution>
<addr-line><![CDATA[Morelia ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,New Mexico Tech Physics Department ]]></institution>
<addr-line><![CDATA[Socorro NM]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Adjunct Astronomer at the National Radio Astronomy Observatory  ]]></institution>
<addr-line><![CDATA[Socorro NM]]></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=S0185-11012018000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012018000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012018000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We present a multiwavelength study of the cometary H II region G12.21-0.10 using the VLA and OVRO. Both radio continuum (0.3, 0.7, 2 and 3.6 cm) and spectral lines of H41&#945;, 13CS(2&#8722;1) &amp; (1&#8722;0), and NH3(2,2) &amp; (4,4) observations are included. We find two 3 mm continuum peaks toward G12.21-0.10; one of them is spatially coincident with the UC H II region, while the other coincides spatially with a molecular clump. We also find that the 0.7, 2 and 3.6 cm continuum and H41&#945; line are only detected toward the UC H II region, while the 13CS, and NH3 are spatially associated with the molecular clump. Based on the morphology, kinetic temperature (&#8776;86 K), volumetric density (&#8776;1.5×106 cm&#8722;3) and linear size (&#8776;0.22 pc) of the molecular clump, we suggest this source is consistent with a hot molecular core.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Presentamos un estudio de la región H II cometaria G12.21-0.10 usando el VLA y OVRO. Se incluyen observaciones de radio continuo (0.3, 0.7, 1.3, 2 y 3.6 cm) y de las líneas espectrales H41&#945;, 13CS(2&#8722;1) &amp; (1&#8722;0), NH3(2,2) &amp; (4,4). Encontramos que la emisión de continuo a 3 mm se divide en dos máximos, de los cuales uno está asociado con la región H II ultra compacta (UC), mientras que el otro coincide espacialmente con un núcleo molecular. La emisión de continuo a 0.7, 2 and 3.6 cm y de la línea H41&#945; se detectan únicamente hacia la región H II UC, mientras que la emisión de las líneas moleculares está asociada espacialmente con el núcleo molecular. En base a la morfología, temperatura cinética (&#8776;86 K), densidad volumétrica (&#8776;1.5×106 cm&#8722;3) y tamaño lineal (&#8776;0.22 pc) del núcleo molecular, sugerimos que esta fuente es consistente con un núcleo molecular caliente.]]></p></abstract>
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<kwd lng="en"><![CDATA[ISM: clouds]]></kwd>
<kwd lng="en"><![CDATA[ISM: molecules]]></kwd>
<kwd lng="en"><![CDATA[molecular processes]]></kwd>
<kwd lng="en"><![CDATA[radio continuum: ISM]]></kwd>
<kwd lng="en"><![CDATA[radio lines: ISM]]></kwd>
<kwd lng="en"><![CDATA[stars: formation]]></kwd>
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</article-meta>
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