<?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>S0185-11012018000100007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Emission line galaxies behind the planetary nebula IC 5148: Potential for a serendipity survey with archival data]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kimeswenger]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barria]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kausch]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goldman]]></surname>
<given-names><![CDATA[D. S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Católica del Norte Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[Antofagasta ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Institut f. Astround Teilchenphys  ]]></institution>
<addr-line><![CDATA[Innsbruck ]]></addr-line>
<country>Austria</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Astrodon Imaging  ]]></institution>
<addr-line><![CDATA[Roseville ]]></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=S0185-11012018000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012018000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012018000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During the start of a survey program using FORS2 long slit spectroscopy on planetary nebulae (PN) and their haloes, we serendipitously discovered six background emission line galaxies (ELG) with redshifts of z = 0.2057, 0.3137, 0.37281, 0.4939, 0.7424 and 0.8668. Thus they clearly do not belong to a common cluster structure. We derived the major physical properties of the targets. Since the used long slit covers a sky area of only 570 arcsec2(= 4.3 × 10-5 square degrees), we discuss further potential of serendipitous discoveries in archival data, beside the deep systematic work of the ongoing and upcoming big surveys. We conclude that archival data provide a decent potential for extending the overall data on ELGs without any selection bias.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante el comienzo de un programa de inspección usando espectroscopía de rendija larga con FORS2 en PNe y sus halos, descubrimos por casualidad seis galaxias de fondo con líneas de emisión (ELGs) con valores de corrimiento al rojo de z = 0.2057, 0.3137, 0.37281, 0.4939, 0.7424 y 0.8668, respectivamente. Claramente estas galaxias no pertenecen a un cúmulo en común. Hemos derivado las principales propiedades físicas de estos objetos. Considerando que se ha usado una rendija larga que cubre un área del cielo de tan sólo 570 arcsec2(= 4.3 × 10-5 grados cuadrados), discutimos el futuro potencial del uso de datos de archivo para el descubrimiento casual de estos objetos, mas allá de los extensos programas de inspección actualmente en desarrollo y los futuros. Hemos concluido que estos datos de archivo representan un verdadero potencial para aumentar los datos sobre ELGs, sin efectos de selección.]]></p></abstract>
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<kwd lng="en"><![CDATA[methods: observational]]></kwd>
<kwd lng="en"><![CDATA[surveys]]></kwd>
<kwd lng="en"><![CDATA[techniques: spectroscopic]]></kwd>
</kwd-group>
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