J/A+A/712/A46ivo://CDS.VizieR/J/A+A/712/A46CDSBoselli A.Fossati M.Roehlly Y.Boquien M.Braine J.Cote P.,Cuillandre J.C.Epinat B.Ferrarese L.Gwyn S.Hensler G.2026-08-05T08:25:43Z2026-08-05T09:24:48ZCDS support team

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

cds-question@unistra.frgalaxy-clustersh-ii-regionsWe use narrow-band Halpha+[NII] imaging data gathered during the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE), a blind survey of the Virgo cluster carried out with MegaCam at the Canada-French-Hawaii telescope (CFHT), to identify [HII] regions in 385 galaxies showing ionised gas emission. After excluding objects where the emission is not associated to star formation and edge-on systems, we identify 76645 [HII] regions in 322 star-forming galaxies and study their physical properties for those above the completeness limit of the survey (L(Halpha)>=10^37^erg/s, 34358 regions). The present work is focused on perturbed cluster galaxies, identified as those having a reduced amount of atomic hydrogen when compared to similar objects in the field. We derive composite luminosity functions, diameter and electron density distributions, and several scaling relations, and compare them to those already derived for gas-rich, unperturbed systems identified during the VESTIGE survey. The analysis shows that the statistical and physical properties of HI gas-deficient cluster galaxies are different from those of unperturbed systems, with perturbed objects having a steeper faint-end slope and a brighter characteristic Halpha luminosity than gas-rich galaxies. The difference in the two distributions comes principally from the outer disc (outside the effective radius). Perturbed and unperturbed systems share a similar HII size distribution, while gas-poor objects hosts higher electron density regions than HI-rich systems. The analysis of the scaling relations indicates that perturbed objects have, on average, a lower number of HII regions per unit stellar mass and disc surface than unperturbed systems, with differences increasing with the HI-deficiency parameter, principally in the outer disc where HII regions are less present in gas-poor systems. This systematic difference is also observed in the Halpha luminosity of the first ranked and first three ranked HII regions, which is reduced in HI-deficient systems with respect to gas-rich objects. All these differences can be explained in the framework of galaxy evolution in rich environments, where their hydrodynamic interaction with the surrounding intracluster medium (ram pressure) removes the gas outside-in quenching the star formation activity in the outer disc once the atomic hydrogen is removed.2026A&A...712A..46Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/646/A139 : IC 3476 Halpha image (Boselli+, 2021)J/A+A/650/A99 : NGVS 3543 images at 8 wavelengths (Junais+, 2021)J/A+A/659/A45 : NGC4330 GHASP and PUMA datacubes (Sardaneta+, 2022)J/A+A/659/A46 : Halpha images of 6 lenticular galaxies (Boselli+, 2022)J/A+A/667/A76 : 64 Virgo galaxies radial surface brightness (Junais+, 2022)J/A+A/705/A139 : VESTIGE XIX line spectra and RVs of NGC 4569 tail (Sun+, 2026)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/712/A46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/712/A46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/712/A46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/712/A46https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/712/A46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/712/A46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/712/A46/tablea1 (Properties of the galaxies (perturbed sample))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/712/A46/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/712/A46/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/712/A46/tablea1?GETtext/xml+votable180.050000true182.477416713.050.005555555555555556Cone search capability for table J/A+A/712/A46/tablea2 (Apertures used for the flux extraction and for the identification of the HII regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/712/A46/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/712/A46/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/712/A46/tablea2?GETtext/xml+votable180.050000true182.472833313.05044440.0055555555555555564/1746 5/6928 6931-6932 6937 6941 6943 6964-6965 7009 6/26342-26343 26346-26347 26349-26351 26360 26362 26364 27716 27718-27719 27721 27723 27732-27733 27735-27736 27738-27739 27741-27743 27745 27756-27757 27759 27761-27763 27769-27771 27845 27865 27904-27905 27907 27913-27914 27916-27918 27931 27955 27962 28032-28033 28035 28041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/712/A46?format=asciidefaultJ/A+A/712/A46/tablea1Properties of the galaxies (perturbed sample)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharNGC/ICIC/NGC namemeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainb/aB-band axial ratiophys.angSize;arith.ratiofloatDEJ2000Declination (J2000)pos.eq.dec;meta.mainE(B-V)Galactic extinction E(B-V), from Schlegel et al. (1998ApJ...500..525S)phot.color.excessfloat2aB25.5B-band isophotal diameter at 25.5mag/arcsec^2^arcminphys.angSizefloatReff-iNGVS i-band effective radiusarcsecphys.angSizefloatPA(i)NGVS i-band position angledegpos.posAngintlogMstarlogarithm of the stellar masslog(solMass)phys.massfloatSMCluster subgroup membershipmeta.code.membercharDistDistanceMpcpos.distancefloatA(Ha)A(ha) attenuation in the Halpha linemagphot.mag;spect.linefloatNII/HaThe NII at 6584{AA} to H{alpha} emission line ratiometa.notefloatHI-defHI-deficiency parameterstat.fit.paramfloatNHIINumber of HII regions with L(Ha)>=10^37^erg/smeta.id;obs.fieldintJ/A+A/712/A46/tablea2Apertures used for the flux extraction and for the identification of the HII regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right ascension of the aperture (J2000)pos.eq.ra;meta.mainDEJ2000Declination of the aperture (J2000)pos.eq.dec;meta.mainMajaxisSemi major axis of the elliptical aperturearcsecphys.angSize.smajAxis;instr.fovfloatMinaxisSemi minor axis of the elliptical aperturearcsecphys.angSize.sminAxis;instr.fovfloatPAposition angle of the elliptical aperture, measured from north counter clockwisedegpos.posAng;instr.fovintJ/A+A/712/A46/tablea3Best-fit parameters of the fit of the luminosity function for individual galaxiesB_Phi*? Phi* parameter of the best-fit Schechter function at the 84th percentile of the marginalised posterior distributionphys.luminosity.fun;meta.modelledfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharb_alphaalpha parameter of the best-fit Schechter function at the 16th percentile of the marginalised posterior distributionmeta.notefloatalphaalpha parameter of the best-fit Schechter function of the marginalised posterior distributionstat.fit.paramfloatB_alphaalpha parameter of the best-fit Schechter function at the 84th percentile of the marginalised posterior distributionmeta.notefloatb_logL*(Ha)Characteristic Halpha luminosity (in log) of the best-fit Schechter function at the 16th percentile of the marginalised in erg/s posterior distributionlog(1e-07W)phys.luminosity.fun;spect.line;meta.modelledfloatlogL*(Ha)Characteristic Halpha luminosity (in log) of the best-fit Schechter function of the marginalised posterior distribution in erg/slog(1e-07W)phys.luminosity;em.line.HalphafloatB_logL*(Ha)Characteristic Halpha luminosity (in log) of the best-fit Schechter function at the 84th percentile of the marginalised posterior distribution in erg/slog(1e-07W)phys.luminosity.fun;spect.line;meta.modelledfloatb_Phi*? Phi* parameter of the best-fit Schechter function at the 16th percentile of the marginalised posterior distributionphys.luminosity.fun;meta.modelledfloatnullablePhi*? Phi* parameter of the best-fit Schechter function of the marginalised posterior distributionstat.fit.paramfloatnullable