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<ri:Resource created="1999-12-22T23:05:40Z" 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>Large Scale Structure</title><shortName>J/AJ/112/1803</shortName><identifier>ivo://CDS.VizieR/J/AJ/112/1803</identifier><altIdentifier>doi:10.26093/cds/vizier.51121803</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Marzke R.O.</name></creator><creator><name>Huchra J.P.</name></creator><creator><name>Geller M.J.</name></creator><date role="Updated">2023-04-06T16:50:22Z</date><date role="Created">1999-12-22T23:05:40Z</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>galaxy-clusters</subject><description>We have extended the CfA Redshift Survey to low galactic latitudes to investigate the relation between the Great Wall in the North Galactic Cap and the Perseus-Pisces chain in the South Galactic Cap. We present redshifts for 2020 galaxies in the Catalogue of Galaxies and of Clusters of Galaxies (Zwicky et al. 1961-68, CGCG, Cat. &lt;VII/4&gt;) in the following regions: 4h&lt;=RA&lt;=8h, 17h&lt;=Dec.&lt;=20h, 0deg&lt;=Dec.&lt;=45deg. In these regions, the redshift catalogue includes 1664 galaxies with B(0)&lt;=15.5 (of which 820 are newly measured) and is 97% complete. We also include redshifts for an additional 356 galaxies in these regions with B(0)&gt;15.5; of these, 148 were previously unmeasured. The CGCG samples the galaxy distribution down to b_(II)_~10deg. In this paper, we discuss the acquisition and reduction of the spectra, and we examine the qualitative features of the redshift distribution. The Great Wall and the Perseus-Pisces chain are not simply connected across the Zone of Avoidance. These structures, which at first appear to be coherent on scales of ~100h^-1^Mpc or more, actually form the boundaries of neighboring voids of considerably smaller scale, approximately 50h^-1^Mpc. The structures delineated by our optically-selected sample are qualitatively similar to those detected by the far-infrared-selected IRAS 1.2 Jansky Survey (Fisher et al., 1995ApJS..100...69F). Although the IRAS survey probes more deeply into the Zone of Avoidance, our optically-selected survey provides better sampling of structures at b_(II)&gt;=10deg. 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