J/MNRAS/521/2012ivo://CDS.VizieR/J/MNRAS/521/2012CDSWatkins A.E.Salo H.Kaviraj S.Collins C.A.Knapen J.H.Venhola A.,Roman J.2026-06-17T08:35:41Z2026-06-17T09:27:09ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-clustersgalaxy-radiiastrometryphotometryvisible-astronomystellar-massesDwarf galaxies are excellent cosmological probes, because their shallow potential wells make them very sensitive to the key processes that drive galaxy evolution, including baryonic feedback, tidal interactions, and ram pressure stripping. However, some of the key parameters of dwarf galaxies, which help trace the effects of these processes, are still debated, including the relationship between their sizes and masses. We re-examine the Fornax Cluster dwarf population from the point of view of isomass-radius-stellar mass relations (IRSMRs) using the Fornax Deep Survey Dwarf galaxy Catalogue, with the centrally located (among dwarfs) 3.63M_{sun}_/pc^2^ isodensity radius defining our fiducial relation. This relation is a powerful diagnostic tool for identifying dwarfs with unusual structure, as dwarf galaxies' remarkable monotonicity in light profile shapes, as a function of stellar mass, reduces the relation's scatter tremendously. By examining how different dwarf properties (colour, 10th nearest neighbour distance, etc.) correlate with distance from our fiducial relation, we find a significant population of structural outliers with comparatively lower central mass surface density and larger half-light-radii, residing in locally denser regions in the cluster, albeit with similar red colours. We propose that these faint, extended outliers likely formed through tidal disturbances, which make the dwarfs more diffuse, but with little mass-loss. Comparing these outliers with ultra-diffuse galaxies (UDGs), we find that the term UDG lacks discriminatory power; UDGs in the Fornax Cluster lie both on and off of IRSMRs defined at small radii, while IRSMR outliers with masses below ~10^7.5^M_{sun}_ are excluded from the UDG classification due to their small effective radii.2023MNRAS.521.2012Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/2012CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/491/1901 : Dwarf galaxies in the MATLAS low-density fieldsJ/MNRAS/416/1680 : ATLAS3D project. VII. (Cappellari+, 2011)J/MNRAS/384/1544 : Surface photometry of local dwarf galaxies (Sharina+, 2008)J/MNRAS/357/819 : Colours and HI line observations in Virgo (Sabatini+, 2005)J/A+A/662/A43 : The Fornax Deep Survey (FDS) with VST. XII. (Venhola+, 2022)J/A+A/660/A69 : S4G extension for nearby early-type galaxies (Watkins+,2022)J/A+A/647/A100 : Fornax Deep Survey with VST. XI. (Su+, 2021)J/A+A/623/A1 : Fornax Deep Survey with VST. V. Isophote fit (Iodice+, 2019)J/A+A/620/A165 : Fornax Deep Survey with VST. IV. dwarf galaxiesJ/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB galaxiesJ/A+A/587/A160 : 3.6um S4G Galactic bars characterization (Diaz-Garcia+,2016)J/A+A/581/A10 : VEGAS: A VST Early-type GAlaxy Survey (Capaccioli+, 2015)J/ApJ/660/1186 : VCC galaxies classification with SDSS (Lisker+, 2007)J/ApJS/219/4 : S4G pipeline 4: multi-component decompositions (Salo+, 2015)J/AJ/138/1037 : Star formation in Centaurus A Group dwarfs (Cote+ 2009)J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Galaxieshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/521/2012https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/521/2012http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/521/2012https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/521/2012https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/521/2012http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/521/2012GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/521/2012/table (The isomass radii, galaxy central coordinates and stellar masses for FDS galaxies sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/521/2012/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/521/2012/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/521/2012/table?GETtext/xml+votable180.050000true54.221900939941406-34.938400268554690.0055555555555555564/2158 5/8623 8636 6/34487 34491 34507 34509-34511 34520 34522-34523 34552-34554 35860 35905 35908-35909https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/521/2012?format=asciiOpticaldefaultJ/MNRAS/521/2012/tableThe isomass radii, galaxy central coordinates and stellar masses for FDS galaxies samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name in catalogue FDSDC (Name)meta.id;meta.maincharVenhola18Display the Fornax Deep Survey with VST of Venhola et al. 2018A&A...620A.165V, Cat. J/A+A/620/A165meta.ref.urlcharSu21Display the Fornax Deep Survey with VST of Su et al. 2021A&A...647A.100S, Cat. J/A+A/647/A100meta.ref.urlcharRAJ2000Galaxy centre right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Galaxy centre declination (J2000) (Dec)degpos.eq.dec;meta.mainlogM*? The logarithm of stellar mass (logMstar)log(solMass)phys.massdoublenullableSimbadNameSimbad column added by the CDSmeta.idcharnullablee_logM*? The uncertainty on logM* (dlogMstar)log(solMass)stat.errordoublenullableR36.31? The axial-ratio-corrected 36.31 Msun/pc^2^ isomass radius (R36.31)arcsecphys.angSize;srcdoublenullableR14.45? The axial-ratio-corrected 14.45 Msun/pc^2^ isomass radius (R14.45)arcsecphys.angSize;srcdoublenullableR5.75? The axial-ratio-corrected 5.75 Msun/pc^2^ isomass radius (R5.75)arcsecphys.angSize;srcdoublenullableR3.63? The axial-ratio-corrected 3.63 Msun/pc^2^ isomass radius (R3.63)arcsecphys.angSize;srcdoublenullableR2.29? The axial-ratio-corrected 2.29 Msun/pc^2^ isomass radius (R2.29)arcsecphys.angSize;srcdoublenullableR1.45? The axial-ratio-corrected 1.45 Msun/pc^2^ isomass radius (R1.45)arcsecphys.angSize;srcdoublenullableR0.92? The axial-ratio-corrected 0.92 Msun/pc^2^ isomass radius (R0.92)arcsecphys.angSize;srcdoublenullableR0.36? The axial-ratio-corrected 0.36 Msun/pc^2^ isomass radius (R0.36)arcsecphys.angSize;srcdoublenullableR0.14? The axial-ratio-corrected 0.14 Msun/pc^2^ isomass radius (R0.14)arcsecphys.angSize;srcdoublenullablee_R3.63? The lower estimate for R3.63 from sky-subtraction uncertainty (R3.63_l)arcsecstat.errordoublenullableE_R3.63? The upper estimate for R3.63 from sky-subtraction uncertainty (R3.63_u)arcsecstat.error;stat.maxdoublenullablee2_R3.63? The lower estimate for R3.63 from 10% calibration uncertainty (R3.63_l10)arcsecstat.errordoublenullableE2_R3.63? The upper estimate for R3.63 from 10% calibration uncertainty (R3.63_u10)arcsecstat.errordoublenullableS4GDisplay the S4G catalog V2, pipeline 4 and extension of nearby ETGs of Seth et al. 2010PASP..122.1397S, Cat. J/PASP/122/1397, Salo et al. 2015ApJS..219....4S, Cat. J/ApJS/219/4 and Watkins et al. 2022A&A...660A..69W, Cat. J/A+A/660/A69meta.ref.urlintnullable