J/A+AS/130/341ivo://CDS.VizieR/J/A+AS/130/341CDSTrasarti-Battistoni R.2012-11-13T12:54:00Z2007-08-30T12:55:29ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiescatalogsgalaxy-kinematicsWe present a large catalog of galaxy loose groups in the Southern Galactic Hemisphere, selected from the Perseus-Pisces redshift Survey (PPS). Particular care is taken in order to obtain group samples as homogeneous as possible to previously published catalogs. Groups are identified with the adaptive Friends-of-Friends (FoF) algorithm of Huchra & Geller (1982ApJ...257..423H), with suitable normalizations V_0_=350km/s and D_0_=0.231h.Mpc. As a necessary ingredient of FoF algorithms, we obtain the galaxy luminosity function (LF) for PPS. Its Schechter parameters ({alpha}=-1.15+/-0.15, M_*_=-19.3+/-0.1) are in good agreement with similar LF estimates from samples previously used to select groups. The LF normalizations {phi}_*_=0.02h^3^/Mpc^3^ appropriate for PPS yields a density threshold {delta}n/n~180 for the adopted D_0_, apparently rather different from the desired {delta}n/n~80 used in previous studies. We then consider several other link normalizations, and briefly discuss their effect on group properties. We suggest to replace the customarily adopted {delta}n/n parametrization with the more direct D_0_ parametrization. All our catalogs contain N_G_~200 groups, significantly more than in most previous studies where group samples were obtained from galaxy data sets of comparable quality to (but smaller extent than) PPS. The group properties are rather sensitive to the adopted D_0_ and V_0_, but vary little with different redshift corrections, redshift cut-off, and galaxy LF. Loose groups in PPS nicely trace the large scale structure (LSS) in the parent galaxy sample. Physical properties of groups in PPS and in other directly comparable samples are in good agreement. There seems to be a complex interplay among LSS features, FoF grouping procedure, and group properties.1998A&AS..130..341Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/130/341CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/105/1251 : Pisces-Perseus supercluster. V. (Wenger+, 1993)J/AJ/105/1271 : Pisces-Perseus supercluster. VI (Giovanelli+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/130/341https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/130/341http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/130/341https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/130/341https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/130/341http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/130/341GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/130/341/table1 (List of the values of group parameters for D_0_=0.231Mpc/h and V_0_=350km/s)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/130/341/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/130/341/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/130/341/table1?GETtext/xml+votable180.050000true339.424633.83510.0055555555555555566/14 34 50 56 140-141 148 167 203 225 238 242 549 558 564-565 568 573 580 589 620 626-627 653 658 661 682 688 697 731-733 735 738 743 745 747 751 757 783 930 941 943 949 953 956 2129 2134 2143 2145 2167 2169 2186 2210 2214-2216 2218 2220 2222 2229-2230 2247 2251 2257 2260-2261 2264 2276 2300 2306 2308 2310 2334 2339 2354 2358 2384 2433 2564 2569 2599 2636 13381 13385 13423 13427 13522 13529 13570 13611 17767 17779 17866 17888 17899 17915 18013 18035-18036 18071 18103 18123 18168 18184 18195 18206 18235 18262 18285 18290 18296 18302 18324 18385 18405-18406 18865 18897 18901 18912 18935 18939 19283 19302 19321 19483 19496 19515 19536 19538 19601 19608 19622 19626 19661 19699 19754 19780 19877 19897 19918 19923 19943 19952 19958 19983 20008 20015 20031 20060 20072 20124 20137 20193 20206 20208-20209 20213 20220 20270 20278 20282 20284 20303 20308-20309 20315-20316 20321 20325 20332 20358 20369 20372-20373 20375 20392 20403 20408 20417 20432https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/130/341?format=asciiOpticaldefaultJ/A+AS/130/341/table1List of the values of group parameters for D_0_=0.231Mpc/h and V_0_=350km/srecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification of groupmeta.id;pos.lgintNmembNumber of membersmeta.numberintRA1950Mean right ascension 1950 (1)pos.eq.ra;meta.mainDE1950Mean declination 1950pos.eq.dec;meta.mainczMean redshift of memberskm/sphys.veloc;pos.heliocentricintsigmaVelocity dispersionkm/sphys.veloc.dispersionintRpMean pairwise separation of members (2)Mpcpos.distancefloatRhMean harmonic (virial) radius (2)Mpcphys.size.radiusfloatlog(L)Log of total luminosity (2) (3)log(solLum)phys.luminosityfloatlog(M)Log of virial mass (2)log(solMass)phys.massfloatlog(M/L)Log of mass-to-light ratio (2) (3)log(Sun)phys.composition.massLightRatiofloatt(cr)Crossing time (2) (4)Mpc.s/kmtime.crossingfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed