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<ri:Resource created="2015-09-09T09:12:11Z" 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>CaII absorbers in SDSS QSOs</title><shortName>J/MNRAS/444/1747</shortName><identifier>ivo://CDS.VizieR/J/MNRAS/444/1747</identifier><altIdentifier>doi:10.26093/cds/vizier.74441747</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Sardane G.M.</name></creator><creator><name>Turnshek D.A.</name></creator><creator><name>Rao S.M.</name></creator><date role="Updated">2024-08-10T20:18:37Z</date><date role="Created">2015-09-09T09:12:11Z</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>quasars</subject><subject>redshifted</subject><subject>line-intensities</subject><description>We present the results of a survey for CaII {lambda}{lambda}3934,3969 absorption-line systems culled from ~95000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest CaII catalogue compiled to date, spanning redshifts z&lt;1.34, which corresponds to the most recent ~8.9Gyr of the history of the Universe. We derive statistics on the Caii rest equivalent width distribution and incidence. We find that the {lambda}3934 rest equivalent width (W_0_^{lambda}3934^) distribution cannot be described by a single exponential function. A double exponential function is required to produce a satisfactory description.</description><source format="bibcode">2014MNRAS.444.1747S</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/444/1747</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/VII/270">VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/194/45">J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 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Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>QSO</name><description>Quasar name, JHHMMSS.ss+DDMMSS.s</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="19*">char</dataType></column><column><name>zem</name><description>[0.1/4.3] Emission redshift</description><ucd>src.redshift</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>zabs</name><description>[0.02/1.35] Absorption redshift</description><ucd>src.redshift</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>gmag</name><description>[16.4/22] SDSS g magnitude</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>W0a</name><description>[0.1/2.6] {lambda}3934 rest equivalent width</description><unit>0.1nm</unit><ucd>spect.line.eqWidth</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_W0a</name><description>[0.02/0.39] rms uncertainty on W0a</description><unit>0.1nm</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>W0b</name><description>[0.1/1.6] {lambda}3969 rest equivalent width</description><unit>0.1nm</unit><ucd>spect.line.eqWidth</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_W0b</name><description>[0.02/0.49] rms uncertainty on W0b</description><unit>0.1nm</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Sloan</name><description>Display the SDSS data for this quasar</description><ucd>meta.ref.url</ucd><dataType xsi:type="vs:VOTableType" arraysize="*">char</dataType></column><column><name>_RA</name><description>Positions from QSO name (right ascension part)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd></column><column><name>_DE</name><description>Positions from QSO name (declination part)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd></column></table></schema></tableset></ri:Resource>