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<ri:Resource created="2005-12-09T11:10:22Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>EINSTEIN extended source survey (EXSS)</title><shortName>IX/18</shortName><identifier>ivo://CDS.VizieR/IX/18</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Oppenheimer B.R.</name></creator><creator><name>Helfand D.J.</name></creator><creator><name>Gaidos E.J.</name></creator><date role="Updated">2005-12-09T10:11:11Z</date><date role="Created">2005-12-09T11:10:22Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>x-ray-sources</subject><subject>galaxy-clusters</subject><description>This catalog contains sources from data collected by the IPC on board the EINSTEIN Observatory. This survey is designed to find extended sources and diffuse emission rather than point sources. In addition, the source detection algorithm is substantially improved over that used by EMSS. Sources were searched using circular apertures up to 6.1arcmin. 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Star number from the Positions and Proper Motions (PPM) Catalog (&lt;I/146&gt;, &lt;I/193&gt; and &lt;I/208&gt;) for the star which is identified with the EXSS source.</description><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>Vmag</name><description>? V band magnitude of the PPM star</description><unit>mag</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dRA11</name><description>? Right ascension difference between PPM and EXSS positions</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dDE11</name><description>? Declination difference between the PPM and EXSS positions</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>EMSS</name><description>EMSS source &lt;IX/15&gt; identified with the EXSS source</description><dataType xsi:type="vs:VOTableType" arraysize="13*">char</dataType></column><column><name>Typ11</name><description>Type of the EMSS source (from EMSS catalog)</description><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column><column><name>S/N11</name><description>? Signal to noise ratio of the EMSS source with the EMSS detection algorithm</description><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dRA12</name><description>? Right ascension difference between the EMSS and the EXSS positions</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dDE12</name><description>? Declination difference between the EMSS and the EXSS positions</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ZwCl</name><description>Zwicky cluster of galaxies identified with the EXSS source (see cat. &lt;VII/4&gt;)</description><dataType xsi:type="vs:VOTableType" arraysize="12*">char</dataType></column><column><name>Size</name><description>? Approximate size of the Zwicky cluster (from the Zwicky catalog)</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dRA13</name><description>? Right ascension difference between ZwCl and EXSS positions.</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dDE13</name><description>? Declination difference between ZwCl and EXSS positions.</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Abell</name><description>Abell cluster of galaxies identified with the EXSS source (see cat. &lt;VII/4&gt;)</description><dataType xsi:type="vs:VOTableType" arraysize="10*">char</dataType></column><column><name>dRA14</name><description>? Right ascension difference between Abell and EXSS positions</description><unit>arcsec</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>dDE14</name><description>? 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