J/other/NewA/27.ivo://CDS.VizieR/J/other/NewA/27.41CDSSampaio F.S.Ribeiro A.L.B.2017-11-29T11:48:28Z2015-04-29T13:49:59ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxy-kinematicsWe study 416 galaxy systems with more than 7 members selected from the 2MASS catalog. We applied five well known normality tests to the velocity distributions of these systems to distinguish Gaussian and non-Gaussian clusters. Using controlled samples, we estimated type I and II errors for each test. We verified that individual tests minimize the chances of classifying a Gaussian system as non-Gaussian, while the Fisher's meta-analysis method, a procedure to combine p-values from several statistical tests, minimizes the chances of classifying a non-Gaussian system as Gaussian. Taking the positive elements of each method and also including a modality analysis of the velocity distribution, we defined objective criteria to split up the sample into Gaussian and non-Gaussian clusters. Our analysis indicates that 50-58% of groups have Gaussian distribution, a lower fraction than that we found using individual normality tests, 71-87%. We also found that some properties of galaxy clusters are significantly different between Gaussian and non-Gaussian systems. For instance, non-Gaussian clusters have larger radii and contain more galaxies than Gaussian clusters. Finally, we discussed the importance of choosing the adequate methodology to classify galaxy systems from their velocity distributions and also the dependence of the results on the criteria used to identify clusters in galaxy surveys.2014NewA...27...41Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/27.41CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/655/790 : Groups of galaxies in 2MASS survey (Crook+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/27.41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/27.41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/27.41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/27.41https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/27.41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/27.41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/NewA/27.41/appena (Complete results for the classification of Gaussian and non-Gaussian groups taking galaxies within R200)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NewA/27.41/appena?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NewA/27.41/appena?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NewA/27.41/appena?GETtext/xml+votable180.050000true2.637547.83472220.0055555555555555566/50 79 140 149 248 377 425 539 562 621 732 748 947 948 953 1178 1189 1261 1262 1440 1526 1579 1593 1601 1617 1642 1667 1700 1705 1739 1742 1783 1831 2142 2229 2230 2251 2322 2383 2384 2388 2412 2432 2507 2537 2790 2793 2846 2953 3081 3105 3131 3348 3369 3493 3500 3501 3513 3559 3565 4361 4516 4718 4804 4813 5128 5330 5512 5940 6085 6100 6668 6777 6780 6951 6962 6963 7031 7165 7320 7354 7517 7660 7683 7684 7693 7923 7924 7975 7980 8110 8123 8173 8178 8196 8228 8367 8373 8557 8567 8697 8749 8938 9098 9452 9470 9623 9886 9946 10183 10378 10379 10444 10445 10522 10532 10539 10597 10628 10637 10639 10715 10918 10941 11791 11938 12024 12242 13522 13543 13550 13761 13914 14840 16473 16543 17595 17606 17662 17743 17779 17792 17898 17926 17942 17973 18010 18048 18120 18123 18235 18296 18324 19618 19897 19900 20206 20223 20309 20324 20325 20725 21108 21171 21183 21306 22318 22361 22555 22572 22577 22605 22638 22639 22746 22913 22915 22936 22939 22944 22954 23025 23041 23088 23089 23132 23169 23178 23255 23328 23418 24133 24256 24356 24426 24633 24681 24768 24839 24949 24951 25052 25173 25344 25416 25509 25596 25610 25657 25737 25760 25771 25774 25891 25972 25981 26000 26110 26316 26387 26392 26422 26451 26563 26707 26932 27160 27598 27652 27728 27739 27803 27857 28075 28150 28192 28198 28220 28230 28251 28253 28287 28417 28430 28444 28446 28453 28515 28545 28610 29234 29290 29374 29625 30840 30894 31031 31111 31199 32540 33230 33533 33825 33922 33954 34331 34354 34385 34540 34961 35016 35054 35055 35067 35073 35171 35631 35719 35985 36066 36243 36244 36643 36671 36713 36739 36785 37310 37550 37600 37636 37649 38054 38085 38098 38129 38132 38139 38196 38350 38404 38486 38513 38515 38519 38588 38658 38704 38784 38816 38825 38848 38852 38916 38976 39615 39629 39660 39721 39778 39806 39847 39857 40060 40065 40068 40300 40402 40457 41234 41423 41455 41456 41581 42114 42138 42603 42674 42846 43078 43081 43082 43266 43299 43423 43426 43502 43503 43522 43602 43624 43712 43816 43821 43828 43874 43877 43913 43915 43925 43941 43949 43977 44006 44028 44030 44064 44199 44270 44550 44554 44555 44828 45633 45754 45802 45821 46043 46568 46987 47179 47420 47943 48944https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/NewA/27.41?format=asciiOpticaldefaultJ/other/NewA/27.41/appenaComplete results for the classification of Gaussian and non-Gaussian groups taking galaxies within R200recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[LDC HDC] Low or High Density Contrast groupmeta.id.part;meta.maincharID[6/1260] Group number (1)meta.id.part;meta.mainintN200[8/300] Number of galaxies within R200meta.numberintsigma[43/950] Velocity dispersion {sigma}km/sphys.veloc.dispersionfloatR200[0.1/3] Virial radius, R200Mpcphys.size.radiusfloatlogM200[11.2/15.3] Mass of galaxies within R200log(solMass)phys.massfloatm12[-4.3/0] Magnitude difference between the first and second brightest galaxiesmagstat.variance;phot.mag;arith.difffloatv200[0.6/4.2] Number density of galaxies (in N200*Mpc^-3^ unit)Mpc**-3meta.number;phys.densityfloatDP[0/1] Gaussian (0) or non-Gaussian (1) group according to the DP testsrc.classintMA[0/1] Gaussian (0) or non-Gaussian (1) group according to the metanalysissrc.classintmod[0/1] Gaussian (0) or non-Gaussian (1) group according to the modality analysissrc.classintSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main