J/ApJ/949/72ivo://CDS.VizieR/J/ApJ/949/72doi:10.26093/cds/vizier/ba-xn-28CDSGiunchi E.Gullieuszik M.Poggianti B.M.Moretti A.Werle A.,Scarlata C.Zanella A.Vulcani B.Calzetti D.2026-07-02T11:59:19Z2025-08-28T09:58:40ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesvisible-astronomyspectroscopyredshiftedgalaxy-kinematicsstar-forming-regionshst-photometryultraviolet-astronomyExploiting broad- and narrowband images of the Hubble Space Telescope from the near-UV to I-band rest frame, we study the star-forming clumps of six galaxies of the GASP sample undergoing strong ram pressure stripping. Clumps are detected in H{alpha} and near-UV, tracing star formation on different timescales. We consider clumps located in galaxy disks and stripped tails and formed in stripped gas but still close to the disk, called extraplanar. We detect 2406 H{alpha}-selected clumps (1708 in disks, 375 in extraplanar regions, and 323 in tails) and 3745 UV-selected clumps (2021 disk, 825 extraplanar, and 899 tail clumps). Only ~15% of star-forming clumps are spatially resolved, meaning that most are smaller than ~140pc. We study the luminosity and size distribution functions (LDFs and SDFs, respectively) and the luminosity-size relation. The average LDF slope is 1.79+/-0.09, while the average SDF slope is 3.1+/-0.5. The results suggest that the star formation is turbulence-driven and scale-free, as in main-sequence galaxies. All of the clumps, whether they are in the disks or tails, have an enhanced H{alpha} luminosity at a given size, compared to the clumps in main-sequence galaxies. Indeed, their H{alpha} luminosity is closer to that of clumps in starburst galaxies, indicating that ram pressure is able to enhance the luminosity. No striking differences are found among disk and tail clumps, suggesting that the different environments in which they are embedded play a minor role in influencing the star formation.2023ApJ...949...72Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/949/72CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/132/37 : Spectroscopy of Southern warm IR galaxies (Kewley+, 2001)J/A+A/495/707 : WINGS spectroscopy of 48 galaxy clusters (Cava+, 2009)J/ApJ/735/75 : HST observations of HII regions in M51 (Lee+, 2011)J/MNRAS/452/3508 : Young stellar structures in NGC 6503 (Gouliermis+, 2015)J/MNRAS/462/3766 : List of galaxies with star forming regions (Cook+, 2016)J/AJ/151/78 : Jellyfish galaxy cand. in galaxy clusters (Poggianti+, 2016)J/A+A/607/A81 : Properties of the sample of clusters (Biviano+, 2017)J/ApJ/895/106 : GAs Stripping Phenomena with MUSE (Franchetto+, 2020)J/ApJ/899/13 : GASP. XXI. Star forming rate in 54 gal. (Gullieuszik+, 2020)J/A+A/640/A22 : Jellyfish galaxy JO201 JVLA datacube (Ramatsoku+, 2020)J/ApJ/907/22 : GASP. XXXII. Diffuse Ionized Gas (DIG) data (Tomicic+, 2021)J/A+A/658/A188 : PHANGS-MUSE sample HII regions catalog (Santoro+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/949/72https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/949/72http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/949/72https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/949/72https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/949/72http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/949/72GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/949/72/table1 (Summary of the main properties of the galaxies studied in this paper and their host clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/72/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/72/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/72/table1?GETtext/xml+votable180.050000true312.82330417-52.822872220.005555555555555556Cone search capability for table J/ApJ/949/72/tablea3 (Catalog of H{alpha}- and UV-selected clump)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/72/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/72/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/72/tablea3?GETtext/xml+votable180.050000true312.8505610661326-52.83359206651160.0055555555555555566/17237 19130 20083 27224 28005 459812.238682544986967e-19 7.886974166154988e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/949/72?format=asciiUVOpticaldefaultJ/ApJ/949/72/table1Summary of the main properties of the galaxies studied in this paper and their host clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNcNumber of clump for this galaxy (link to Table A3)meta.numberintnullableGalGalaxy identifier (1)meta.id;meta.maincharprimaryRAJ2000Galaxy Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Galaxy Degree of declination (J2000)pos.eq.dec;meta.mainMs[3.2/29] Galaxy stellar mass from Vulcani+ 2018ApJ...866L..25V1e+10solMassphys.massfloate_Ms[2.4/22] Lower uncertainty on Ms1e+10solMassstat.error;stat.min;phys.massfloatClusterHost cluster namemeta.id.parentcharSimbadNameSimbad column added by the CDSmeta.idcharnullableE_Ms[3.7/36] Upper uncertainty on Ms1e+10solMassstat.error;stat.max;phys.massfloatHa/Ha+NII[0.53/0.71] Median value for H{alpha} to H{alpha}+[NII] ratio (2)phot.flux;stat.median;arith.ratiofloatzGal[0.04/0.07] Redshift of the galaxysrc.redshift;pos.heliocentricfloatsigma[575/859] Cluster velocity dispersion (3)km/sphys.veloc.dispersioninte_sigma[-49/-31]? Lower uncertainty on sigmakm/sstat.error;stat.min;phys.veloc.dispersionintnullableE_sigma[33/53]? Upper uncertainty on sigmakm/sstat.error;stat.max;phys.veloc.dispersionintnullablezCluster[0.04/0.07] Cluster redshift (3)src.redshift;pos.heliocentricfloatRefReferences (4)meta.refcharJ/ApJ/949/72/tablea3Catalog of H{alpha}- and UV-selected clumpGalGalaxy identifier (2)meta.id.parentchare_F606WUncertainty in F606WcW.m**-2.nm**-1stat.error;phot.flux.density;em.opt.RdoubleF680NHST/WFC3 F680N Flux Density, erg.Angstrom-1.s-1.cm-2cW.m**-2.nm**-1phot.flux.density;em.opt.Rdoublee_F680NUncertainty in F680NcW.m**-2.nm**-1stat.errordoubleF814W[-9.5e-21/5.92e-16] HST/WFC3 F814W Flux Density, erg.Angstrom-1.s-1.cm-2cW.m**-2.nm**-1phot.flux.density;em.opt.Idoublee_F814W[3e-21/3.31e-19] Uncertainty in F814WcW.m**-2.nm**-1stat.error;phot.flux.density;em.opt.IdoubleF680Ncont[-1.2e-16/1.4e-13] Continuum-subtracted F680N line flux, erg/s/cm2mW.m**-2phot.flux;em.opt.R;spect.linedoublee_F680Ncont[2.5e-18/1.71e-16] Uncertainty in F680NmW.m**-2stat.error;phot.flux;em.opt.RdoubleDendro[0/3]? Position of clump in tree hierarchy (dendro_flag) (5)meta.codeintnullableTail[0/2]? Spatial category of the clump (tail_gal_flag) (6)meta.codeintnullableBPT[0/4]? BPT category (BPT_flag) (7)meta.codeintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSelection Filter (1)meta.code;src.sample;em.wlcharClumpClump identifier (id_clump) (2)meta.id;meta.maincharRun[ABC] Astrodendro Run (id_catalog) (2)(3)meta.notecharidx[0/1763] Identifier number (in Selection Filter) (2)meta.idintRAJ2000[10.3/354.2] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-53/21.2] Declination (J2000)degpos.eq.dec;meta.mainx_LumUnit for Lum (4)meta.unitcharLumLuminosity (4)phys.luminositydoublee_Lum[9.7e+34/8.4e+38] Uncertainty in Lum (4)stat.error;phys.luminositydoubleArea[0.008/11.5] Area (area_exact)arcsec**2phys.areafloatamaj[0.02/1.5] Semi-major axis (major_sigma)arcsecphys.angSize.smajAxisfloatbmin[0.01/0.8] Semi-minor axis (minor_sigma)arcsecphys.angSize.sminAxisfloatPA[-180/180] Position Angle, east of north (position_angle)degpos.posAngdoublercore[0.018/1.1] Core radiusarcsecphys.angSize;srcfloatrcore-c[0/0.98] PSF-corrected core radius (rcore,corr)kpcphys.size.radiusfloatF275W[-7.83e-20/4.03e-16] HST/WFC3 F275W Flux Density, erg/Angstrom/s/cm2cW.m**-2.nm**-1phot.flux.density;em.UV.200-300nmdoublee_F275W[1.8e-20/1.1e-18] Uncertainty in F275WcW.m**-2.nm**-1stat.error;phot.flux.density;em.UV.200-300nmdoubleF336WHST/WFC3 F336W Flux Density, erg.Angstrom-1.s-1.cm-2cW.m**-2.nm**-1phot.flux.density;em.opt.Udoublee_F336WUncertainty in F336WcW.m**-2.nm**-1stat.error;phot.flux.density;em.opt.UdoubleF606WHST/WFC3 F606W Flux Density, erg.Angstrom-1.s-1.cm-2cW.m**-2.nm**-1phot.flux.density;em.opt.Rdouble