J/MNRAS/416/2437ivo://CDS.VizieR/J/MNRAS/416/2437doi:10.26093/cds/vizier.74162437CDSHolwerda B.W.Pirzkal N.de Blok W.J.G.Bouchard A.Blyth S.-L.,Van Der Heyden K.J.2024-07-15T20:16:41Z2012-05-18T16:00:43ZCDS support team

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

cds-question@unistra.frgalaxiesh-i-line-emissiongalaxy-classification-systemsThe morphology of the atomic hydrogen (HI) disc of a spiral galaxy is the first component to be disturbed by a gravitational interaction such as a merger between two galaxies. We use a simple parametrization of the morphology of HI column density maps of the Westerbork observations of neutral Hydrogen in Irregular and SPiral galaxies (WHISP) project to select those galaxies that are likely undergoing a significant interaction. Merging galaxies occupy a particular part of parameter space defined by Asymmetry (A), the relative contribution of the 20 per cent brightest pixels to the second-order moment of the column density map (M20) and the distribution of the second-order moment over all the pixels (GM). Based on their HI morphology, we find that 13 per cent of the WHISP galaxies are in an interaction (Concentration-M20) and only 7 per cent are based on close companions in the data cube. This apparent discrepancy can be attributed to the difference in visibility time-scales: mergers are identifiable as close pairs for 0.5 Gyr but are identifiable for ~1Gyr by their disturbed HI morphology. Expressed as volume merger rates, the two estimates agree very well: 7 and 6.8x10^-3^mergers/Gyr/Mpc^3^ for paired and morphologically disturbed HI discs, respectively.2011MNRAS.416.2437Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/416/2437CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/MNRAS/416/2401 : Quantified H I morphology. I (Holwerda+, 2011)J/MNRAS/416/2415 : Quantified H I morphology. II (Holwerda+, 2011)J/MNRAS/427/3159 : Quantified H I morphology. VI (Holwerda+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/416/2437https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/416/2437http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/416/2437https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/416/2437https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/416/2437http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/416/2437GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/416/2437/tablea1 (Morphological parameters for the complete WHISP sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/416/2437/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/416/2437/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/416/2437/tablea1?GETtext/xml+votable180.050000true2.268441725.61861940.0055555555555555566/377 697 700 816 896 909 922 932-933 942 955 975 986 1114 1886 1892 2013 2121 2130 2169 2201 2215 2218 2254 2259 2282 2320 2347 2351 2359 2362 2370 2372 2374 2379-2380 2382 2400 2564 2636 2661 2687 2856-2857 2866 3042 3085 3120 3444 3446 3511 3516 3519 3573 3583 3860 3910 3922 4469 4511 4731 4953 5061 5142 5174 5183 5198 5200 5203 5241 5244 5305-5306 5308 5329 5332 5482 5492 5503-5504 5534 5545 5581 5584 5589-5591 5595-5596 5599 5610 5617 5628-5629 5631 5636 5639 5710 5793 5818 5967 5980 5982 5987 5995 6007 6013 6034 6037 6050 6063 6074 6353 6411 6448 6519 6560 6604-6605 6619 6623 6649 6772-6773 6825 6921 6948 7110 7132 7303 7374 7398 7445 7485 7523 7655 7659 7726 7799 7808 7815 7824 7869 7878 7882 7901 7915 7946 7957 8001 8004 8028 8042 8064 8085 8095 8166-8167 8173 8908 9011 9220 9277 9792 9855 9869 10364 10429 10475 10490 10511 10592 10621 10628 10656 10659 10662 10674 10684 10704 10723 10767 10798 10800 10802 10809 10817-10818 10847 10881 10892 10897 10900-10901 10905 10908 10910-10912 10924 10927 10930 10935 10941 10976-10977 10986 10990-10991 11000 11006 11030 11045 11092 11120 11127 11140 11173 11217 11227 11327 11372 11389 11392 11434 11460 11582 11696 11724 11726 11738 11750 11772 11933 11965 12047 12122 13130 13162 13374 13391 13472 13489 13510 13514 13516 13611 13668 13672 13932 13944 13948 14033 14777 14935 15068 15551 15981 16050 16098 16120 16194 20254 20270 20342 20353 20400 20409 28077 28087 28091 28123 28463 28496 28511 28515 28529 28535 28538 28593 28617 28631 28636-28638 28666 32729https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/416/2437?format=asciiOpticalRadiodefaultJ/MNRAS/416/2437/tablea1Morphological parameters for the complete WHISP samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUGCUGC numbermeta.id;meta.mainintGini? Gini parameter (1)stat.fit.paramfloatnullablee_Gini? rms uncertainty on Ginistat.errorfloatnullableM20? Moment of light parameterstat.variancefloatnullablee_M20? rms uncertainty on M20stat.errorfloatnullableC? Concentration parameter, C=5log(r80/r20)stat.paramfloatnullablee_C? rms uncertainty on Cstat.errorfloatnullableA? Asymetry parametersrc.morph.paramfloatnullablee_A? rms uncertainty on Astat.errorfloatnullableS? Smoothness parameterstat.fit.paramfloatnullablee_S? rms uncertainty on Sstat.errorfloatnullableEll? Ellipticitysrc.ellipticityfloatnullablee_Ell? rms uncertainty on Ellstat.errorfloatnullableGM? Gini of the second-order moment parameterstat.fit.paramfloatnullablee_GM? rms uncertainty on GMstat.errorfloatnullableAxy? Index of x and y axis symmetrystat.fit.paramfloatnullablee_Axy? rms uncertainty on Axystat.errorfloatnullableSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_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