J/MNRAS/521/1502ivo://CDS.VizieR/J/MNRAS/521/1502CDSHolwerda B.W.Bigiel F.Bosma A.Courtois H.M.Deg N.Denes H.,Elagali A.For B.-Q.Koribalski B.Leahy D.A.Lee-Waddell K.,Lopez-Sanchez A.R.Oh S.-H.Reynolds T.N.Rhee J.Spekkens K.Wang J.,Westmeier T.Wong O.I.2026-06-12T16:03:48Z2026-06-12T16:49:28ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxy-groupsgalaxiesintergalactic-mediumvisible-astronomynarrow-band-photometryh-i-line-emissiongalaxy-classification-systemsastrometrygalaxy-kinematicsgalaxy-radiiGalaxy morphology in atomic hydrogen (H I) and in the ultraviolet (UV) are closely linked. This has motivated their combined use to quantify morphology over the full H I disc for both H I and UV imaging. We apply galaxy morphometrics: concentration, asymmetry, gini, M20 and multimode-intensity-deviation statistics to the first moment-0 maps of the WALLABY Survey of galaxies in the hydra cluster centre. Taking advantage of this new H I survey, we apply the same morphometrics over the full H I extent on archival GALEX FUV and NUV data to explore how well H I truncated, extended ultraviolet disc (XUV) and other morphological phenomena can be captured using pipeline WALLABY data products. Extended H I and UV discs can be identified relatively straightforward from their respective concentration. Combined with WALLABY H I, even the shallowest GALEX data are sufficient to identify XUV discs. Our second goal is to isolate galaxies undergoing ram-pressure stripping in the H I morphometric space. We employ four different machine learning techniques, a decision tree, a k-nearest neighbour, a support-vector machine, and a random forest. Up to 80 per cent precision and recall are possible with the random forest giving the most robust results.2023MNRAS.521.1502Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/1502CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/493/5089 : HI asymmetries with LVHIS, VIVA, and HALOGASJ/MNRAS/489/5723 : ASKAP HI imaging of the Lyon Group of Galaxies 351J/MNRAS/458/963 : CANDELS galaxy structure classification (Peth+, 2016)J/MNRAS/427/3159 : Quantified HI morphology. VI. NUV/FUV (Holwerda+, 2012)J/MNRAS/416/2401 : HI morphology of 28 THINGS galaxies (Holwerda+, 2011)J/MNRAS/416/2415 : Morphological parameters of WHISP galaxies (Holwerda+, 2011)J/MNRAS/416/2437 : Quantified H I morphology of WHISP sample (Holwerda+, 2011)J/A+A/596/A100 : Planck high-z source candidates catalog (PHZ) (Planck+,2016)J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)J/ApJ/915/70 : WALLABY pilot survey: HI gas in Hydra cluster (Wang+, 2021)J/ApJ/733/74 : GALEX - SDSS properties of local galaxies (Lemonias+, 2011)J/ApJ/731/28 : UV star-forming association in spiral galaxiesJ/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/AJ/128/163 : Galaxy morphological classification (Lotz+, 2004)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/521/1502https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/521/1502http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/521/1502https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/521/1502https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/521/1502http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/521/1502GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/521/1502/table (Astrometric informations and morphometric parameters of our HI WALLABY galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/521/1502/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/521/1502/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/521/1502/table?GETtext/xml+votable180.050000true150.8388-29.28560.0055555555555555565/9691 9703 9708-9709 9712-9713 9716 9720 6/38719 38758-38759 38761-38763 38768 38770 38776 38778-38779 38805-38807 38809-38811 38821 38823 38841 38843-38845 38847 38856 38858-38860 38862-38863 38868 38872-38874 38884-38886 38888https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/521/1502?format=asciiOpticalRadiodefaultJ/MNRAS/521/1502/tableAstrometric informations and morphometric parameters of our HI WALLABY galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOriencOrientation of the centroid (orientation_centroid)degpos.posAngdoubleIDNumber in the WALLABY SoFiA catalog (id)meta.id;meta.mainintWang21Display the WALLABY pilot survey: HI gas in Hydra cluster of Wang et al. 2021ApJ...915...70W, Cat. J/ApJ/915/70meta.ref.urlintnullableReynolds22Display the Hydra I cluster study with H I emission of Reynolds et al. 2022MNRAS.510.1716R, Cat. J/MNRAS/510/1716meta.ref.urlintnullableKim23Display H I gas properties in paired galaxies with WALLABY of Kim et al. 2023MNRAS.519..318K, Cat. J/MNRAS/519/318meta.ref.urlintnullableXposThe x-position in the mosaic data cube (x)pixpos.cartesian.x;instr.detfloatYposThe y-position in the mosaic data cube (y)pixpos.cartesian.y;instr.detfloatZposThe z-position in the mosaic data cube (z)pixpos.frame;instr.detfloatXminMinimum x-pixel in the cutout (x_min)pixpos.cartesian.x;instr.detintXmaxMaximum x-pixel in the cutout (x_max)pixpos.cartesian.x;instr.detintYminMinimum y-pixel in the cutout (y_min)pixpos.cartesian.y;instr.detintYmaxMaximum y-pixel in the cutout (y_max)pixpos.cartesian.y;instr.detintZminMinimum z-pixel in the cutout (z_min)pixpos.frame;instr.detintZmaxMaximum z-pixel in the cutout (z_max)pixpos.frame;instr.detintNpixNumber of pixels in the object (n_pix)meta.numberintFminMinimum flux value (f_min)phot.flux.densitydoubleFmaxMaximum flux value (f_max)phot.flux.densitydoubleFsumSummed flux in the cutout (f_sum)phot.flux.densitydoubleRelRel value quantity always 0 (rel)phot.flux;arith.ratiofloatFlagSSoFiA flag (flag)meta.code.errorfloatRMSRoot-mean-square noise estimate (rms)stat.snr;instr.det.noisedoubleW20The 20% flux width (w20)phys.angSizedoubleW50The 50% flux width (w50)phys.angSizedoubleMajAxisMajor axis of the aperture ellipse (ell_maj)arcsecphys.angSizefloatMinAxisMinor axis of the aperture ellipse (ell_min)arcsecphys.angSize;srcfloatPA[] Position angle of the aperture ellipse (ell_pa)degpos.posAng;instr.fovfloatMajAxis3sMajor axis of the aperture ellipse (ell3s_maj)arcsecphys.angSizefloatMinAxis3sMinor axis of the aperture ellipse (ell3s_min)arcsecphys.angSize;srcfloatPA3s[] Position angle of the aperture ellipse (ell3s_pa)degpos.posAng;instr.fovfloatPAkinKinematic position angle (kin_pa)degpos.posAngfloate_XposUncertainty in the central x-position (err_x)pixstat.error;pos.cartesian.xfloate_YposUncertainty in the central y-position (err_y)pixstat.error;pos.cartesian.yfloate_ZposUncertainty in the central z-position (err_z)pixstat.errorfloate_FsumUncertainty in the summed flux (err_f_sum)stat.errorfloatRAJ2000Right Ascension central position (J2000) (ra)degpos.eq.ra;meta.mainDEJ2000Declination central position (J2000) (dec)degpos.eq.dec;meta.mainFreqFrequency of the central pixel position (freq)Hzem.freq;instr.pixeldoubleCommComments (comments)meta.notecharXcposStatmorph centroid central pixel x-position (xc_centroid)pixpos.cartesian.x;instr.detdoubleYcposStatmorph centroid central pixel y-position (yc_centroid)pixpos.cartesian.y;instr.detdoubleEllcEllipticity of the centroid (ellipticity_centroid)src.ellipticitydoubleEloncElongation of the centroid (elongation_centroid)degphys.angSizeXasyposCentral x-position for asymmetry measure (xc_asymmetry)pixpos.cartesian.x;instr.detdoubleYasyposCentral y-position for asymmetry measure (yc_asymmetry)pixpos.cartesian.y;instr.detdoubleEllasyEllipticity of the asymmetry aperture (ellipticity_asymmetry)src.ellipticitydoubleElonasyElongation of the asymmetry aperture (elongation_asymmetry)degphys.angSizeOrienasyOrientation of the asymmetry aperture (orientation_asymmetry)degpos.posAngdoubleRcircpCircular Petrosian radius (rpetro_circ)arcsecphys.angSize;srcdoubleRellpElliptical Petrosian radius (rpetro_ellip)arcsecphys.angSize;srcdoubleRcirchlCircular half-light radius (rhalf_circ)arcsecphys.angSize;srcdoubleRellhlElliptical half-light radius (rhalf_ellip)arcsecphys.angSize;srcdoubleR20The 20% of flux radius (input for concentration) (r20)arcsecphys.angSize;srcdoubleR80The 80% of flux radius (input for concentration) (r80)arcsecphys.angSize;srcdoubleGiniGini parameter (Gini)src.morph.paramdoubleM20M20 parameter (M20)src.morph.paramdoubleFGM20FGM20 value quantity always 0 (FG;M20)src.morph.paramfloatSGM20SGM20 value quantity always 0 (SG M20)src.morph.paramfloatSNRpixSignal-to-noise per pixel (sn_per_pixel)stat.snrdoublelog(R80/R20)Concentration log (r80/r20) (C)src.morph.paramdoubleCircAsymmetry (A)src.morph.paramdoubleSmoothSmoothness (S)src.morph.paramdoubleSersAmpSersic fit amplitude (sersic_amplitude)src.var.amplitudedoubleSersRhlSersic fit half-light radius (sersic_rhalf)arcsecphys.angSize;srcdoubleSersNSersic fit index (sersic_n)stat.fit.paramdoubleSersXposSersic fit central x-position (sersic_xc)pixpos.cartesian.x;instr.detdoubleSersYposSersic fit central y-position (sersic_yc)pixpos.cartesian.y;instr.detdoubleSersEllSersic fit ellipticity (sersic_ellip)src.ellipticitydoubleSersPASersic fit on-sky angle (position angle) (sersic_theta)degpos.posAngdoubleSkymMean sky value (sky_mean)instr.skyLevelfloatSkymedMedian sky value (sky_median)instr.skyLevelfloatSkysigStandard deviation of sky pixels (sky_sigma)instr.skyLevelfloatSersQFlag for the quality of Sersic fit (flag_sersic)meta.code.qualfloatMMultimode (M)src.morph.paramdoubleIIntensity (I)src.morph.paramdoubleDDeviation (D)src.morph.paramdoubleWALLABYIdentification in the WALLABY SoFiA catalog (catid)meta.idchar