J/A+A/705/A112ivo://CDS.VizieR/J/A+A/705/A112CDSFaucher A.Benisty D.Mota F.D.2026-03-02T06:25:50Z2026-01-13T08:13:18ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-distanceAn independent determination of the Hubble constant is crucial in light of the persistent tension between early- and late-Universe measurements. In this study, we analyze the dynamics of the Centaurus A (CenA) and M83 galaxies, along with their associated dwarf companions identified via Tip of the Red Giant Branch (TRGB) distance measurements, to constrain both the group mass and the local value of H0. By examining the motions of these galaxies relative to the system's barycenter, we apply both the minor and major infall models, which provide bounds on the true radial velocity dispersion. From the overlap from these approaches, we obtain a virial mass estimate of (7.3+/-2.0)x10^12^M_{sun}_ and a Hubble flow-based mass of (2.6+/-1.4)x10^12^M_{sun}_. Modeling the cold Hubble flow around the group center-of-mass, we derive a corresponding value of the Hubble constant as (64.0+/-4.6)km/s/Mpc. These results offer an independent, dynamically motivated constraint on the local value of H0, explicitly accounting for the impact of peculiar velocities in the nearby Universe. We also discuss the ~2{sigma} tension between the virial and Hubble flow-based mass estimates, which likely arises from the fact that M83 is close to the velocity surface and break the Hubble flow model assumptions. While the Hubble flow fit emphasizes galaxies that follow smooth expansion on the lower branch of the velocity-distance relation, the virial mass estimate is found to be in good agreement with the group mass derived from the K-band luminosity of its brightest members and the projected mass methods.2026A&A...705A.112Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A112https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/705/A112/tablea1 (Catalog of galaxies in the Centaurus A and M83 groups and nearby galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/705/A112/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/705/A112/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/705/A112/tablea1?GETtext/xml+votable180.050000true105.1176-4.20710.0055555555555555565/6878 6/4313 4511 4518 4522 4537 4650 8908 16441 16446 16519 16544 20101 20809 22039 22348 22379 22427 22495 24602 24632 24713 24912 24934 24952 25077 25083 25344 25425 25431 26047 26260 26265 26270 26294 26315 26796 26808 26858 27055 27351 27383 27568 27604 27767 27861 27904 27926 28003 28015 28033 28035 28062 28087 28100 28102 28167 29699 30677 36974 37437 38102 38259 38329 38390 38673 38841 38846 38941 39800 40124 40160 40205 40328 41122 41132 41432 41917 41946 41949 41987 43222 43231 43233 43245-43246 43254 43257 43262 43293 43307 43333 43339 43393 43400 43420 43425 43427 43430 43438 43451 43499 43602 43604-43605 43607 43610 43613 43634 43706 43727 43763 43796-43797 43809 43828 43845 43874 43878 43881 43883-43884 43921 43924-43925 43950 45305 45423 45674 45732 45745 45748 45777 45914 46314 46339 46545 46549 46597 47952https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/705/A112?format=asciidefaultJ/A+A/705/A112/tablea1Catalog of galaxies in the Centaurus A and M83 groups and nearby galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy identifiermeta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainDistDistance (central value)Mpcpos.distancefloatvLGVelocity relative to Local Group (central value)km/sphys.velocfloatHubble-MinFlag (Y) if used in minor axis Hubble fitmeta.codecharHubble-MajFlag (Y) if used in major axis Hubble fitmeta.codecharVirial-MinFlag (Y) if used in minor axis virial massmeta.codecharVirial-MajFlag (Y) if used in major axis virial massmeta.codecharRef[1/2] Data source (1)meta.bibintSimbadNameSimbad column added by the CDSmeta.idnullable