J/A+A/706/A370ivo://CDS.VizieR/J/A+A/706/A370CDSBertolotto-Stefanelli R.Downes J.J.Suarez G.Mateu C.Gagne J.,Zuniga C.R.2026-02-25T12:46:33Z2026-02-25T13:45:45ZCDS support team

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

cds-question@unistra.frmilky-way-galaxystellar-associationsradial-velocitystellar-massesvisible-astronomyThe solar neighbourhood is populated by nearby (<200pc), young (<100Myr) moving groups (NYMGs) of stars, whose origins are still debated. A possible explanation is that they are remnants of individual stellar clusters and associations, currently dispersing in the Galactic disc. We aim to derive the initial mass function (IMF) of a large sample of NYMGs. We developed and applied an algorithm that uses photometric and astrometric data from Gaia DR3 to detect NYMGs as over-densities in a kinematic space, whose members distribute along young isochrones. We inferred individual masses from the photometry of both the detected and the previously known candidates. We estimated the IMFs for 33 groups, 30 of them for the first time, in an average mass range 0.1<m/M_{sun}_<5, with some groups going as low as 0.02M_{sun}_ and as high as 10M_{sun}_. We parameterized these IMFs using a log-normal distribution for m<1M_{sun}_ and a power-law for m>1M_{sun}_. We detected 4166 source candidate members of 44 known groups, including 2545 new candidates. We recovered 44-54 percent of the literature candidates and estimated a contamination rate from old field stars of 16-24 percent. The candidates of the detected groups distribute along young isochrones, suggesting that they are potential members of NYMGs. Parameterizations of both the average of the 33 IMFs based on our detections (mc=0.25+/-0.17M_{sun}_, sigmac=0.45+/-0.17, and alpha=-2.26+/-0.09) and the one based on the known candidates from the literature (mc=0.22+/-0.14M_{sun}_, sigmac=0.45+/-0.17, and alpha=-2.45+/-0.06) are in agreement with the IMF parameterization of the solar neighbourhood and young stellar associations. Our parameterization of the average IMF, together with the distribution of the detected group members along young isochrones, provides strong evidence suggesting that the NYMGs are remnants of individual stellar associations and clusters, and that there are no systematic biases in our detection and in the literature in the mass range 0.1<m/M_{sun}_<10.2026A&A...706A.370Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/706/A370CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/706/A370https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/706/A370http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/706/A370https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/706/A370https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/706/A370http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/706/A370GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/706/A370/members (Candidate members of nearby young moving groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/706/A370/members?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/706/A370/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/706/A370/members?GETtext/xml+votable180.050000true273.84263306-32.826088890.0055555555555555564/69 71 80 1511 1517 1519 2355 2358 2663 5/64 67 70-71 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43160-43161 43172 43174-43175 43177 43180 43182-43183 43192 43276-43277 43284 43287 43292-43294 43296-43297 43300-43301 43316 43319 43324 43333 43345 43348-43349 43360-43362 43520-43521 43523-43526 43532 43534-43535 43537 43550 43552-43554 43563 43578 43653 43665 43677 43683 43687 43702 43705 43707-43708 43746 43750 44034 44113 44115 44125 44148 44151 44288 44293 44300 44304-44305 44308-44309 44324-44326 44329 44331-44332 44334 44346 44353-44354 44368 44416 44419-44422 44425 44432 44434-44435 44440 44465 45067 45072-45073 45095 45103 45112 45120 45158 45182 45187 45192 45197 45199 45208-45210 45212 45218-45219 45225 45227 45232 45240 45248 45251 45256 45259 45265 45308 45314 45324 45336 45385 45391 45393 45441 45457 45485 45568-45570 45577 45579-45580 45586 45594 45607 45610 45618 45622 45625 45630 45662 45698-45699 45701 45704-45706 45713 45718 45724 45728 45734 45737-45738 45740 45746 45751 45754 45915 46094 46188 46339 46526 46960 47106-47107 47109 47111-47112 47116 47120-47121 47139-47141 47144 47149 47152 47162 47205 47212 47233 47241-47242 47244 47249-47250 47265 47275 47287 47297 47301 47303 47310 47596 47610 47618 47626 47743 47746 47826 47831 47838 47851 47863 47879 47941 47943 47978 47993 48021 48049 48053 48061 48064 48072 48079 48651 48672 48676 48701 48783 48798https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/706/A370?format=asciiOpticaldefaultJ/A+A/706/A370/membersCandidate members of nearby young moving groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintrcRatio of probability functions (see section 3.4) (rc)stat.fit.paramdoubleplxGaia DR3 parallax (parallax)maspos.parallax.trigfloatAge[10/100] Age of the group according to the MOCA database (age)Myrtime.age;pos.lgfloatRA_ICRSGaia DR3 right ascension (ICRS) at Ep=2016.0 (ra)degpos.eq.ra;meta.mainDE_ICRSGaia DR3 declination (ICRS) at Ep=2016.0 (dec)degpos.eq.dec;meta.maine_plxGaia DR3 parallax error (e_parallax)masstat.error;pos.parallaxfloatGMAGGaia DR3 G band magnitude corrected by distance modulus using inverse of parallax (MG)magphys.magAbsdoublee_GMAGpropagated GMAG error (e_MG)magstat.errordoubleBP-RPGaia DR3 BP-RP color (BR)magphot.color;em.opt.B;em.opt.Rdoublee_BP-RPGaia DR3 BP-RP color propagated error (e_BR)magstat.errordoubleXGalactic cartesian x-coordinate (pointing towards galactic center) (X)pcposdoubleYGalactic cartesian y-coordinate (pointing towards disc rotation) (Y)pcposdoubleZGalactic cartesian z-coordinate (Z)pcposdoubleVRLSRaRight ascension tangential velocity relative to the Local Standard of Rest (vraLSR)km/sphys.veloc;pos.lsrdoubleVRLSRdDeclination tangential velocity relative to the Local Standard of Rest (vdecLSR)km/sphys.veloc;pos.lsrdoublee_XX propagated error (e_X)pcstat.error;pos.cartesian.xdoublee_YY propagated error (e_Y)pcstat.error;pos.cartesian.ydoublee_ZZ propagated error (e_Z)pcstat.error;src.redshiftdoublee_VRLSRaVRLSRa propagated error (e_vraLSR)km/sstat.errordoublee_VRLSRdVRLSRd propagated error (e_vdecLSR)km/sstat.errordoubleMassInferred mass assuming age of host group (mass) (1)solMassphys.massdoublee_Mass? Error on the inferred mass. For stars with rc > 0.1, mass_error = 0 (e_mass)solMassstat.error;phys.massdoublenullableMOCAaIdOriginal group name within the MOCA database (moca_aid)meta.idcharGaiaDR3Gaia DR3 source ID (source_id)meta.id;meta.mainGroupIdName of the detected group in this work (group_id)meta.idcharJ/A+A/706/A370/table1General statistics of nearby young moving groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMOCAaIdOriginal group name within the MOCA database (moca_aid)meta.idcharGroupIdName of the detected group in this work (group_id)meta.idcharAge[3/93] Age of the group according to the MOCA database (age_myr)Myrtime.age;pos.lgfloatAgeIsoAge of the isochrone used to select stars (age_iso_selection_myr)Myrinstr.setupintobsN[10/290] Number of candidate members from MOCA database (observedN)meta.numberfloatobsRVN[1/151] Number of candidate members from MOCA database with RVs in Gaia (observedRVN)meta.numberfloatDmeanAverage heliocentric distance of the candidate members of the group (meand)pcpos.distancedoublee_DmeanStandard deviation of distances of the candidate members of the group (dstd)pcstat.errordoubleNdet[41/800] Number of candidates detected in this work (Ndetected)meta.numberinte_stdImfError on inferred Characteristic width (e_stdImf)stat.errordoubleNdet01[24/442] Number of candidates detected in this work with r_c_>0.1 (Ndetected01)meta.numberintRecovRecovery fraction relative to members from literature (recovery)stat.fit.paramdoubleRecov01Recovery fraction relative to members from literature with r_c_>0.1 (recovery01)stat.fit.paramdoubleSimPurityPurity fraction relative to members from literature (simulationPurity)stat.fit.paramdoubleSlitPurityFraction relative to members from literature with r_c_>0.1 (slitPurity)stat.fit.paramdoubleMassmeanCharacteristic mass of log-normal parametrization of IMF for m<1M_{sun}_ (meanMass)solMassphys.massdoublee_MassmeanError on inferred Characteristic mass (e_meanMass)solMassstat.errordoublestdImfCharacteristic width of log-normal parametrization of IMF for m<1M_{sun}_ (stdImf)stat.fit.paramdoubleSlopeIndex of fitted power-law for IMF for m>1M_{sun}_ (slope)meta.code;spect.index;meta.modelleddoublee_SlopeError on index of fitted power-law for IMF for m>1M_{sun}_ (e_slope)stat.errordoubleMassTotal inferred mass of the detected group (mass)solMassphys.mass;pos.lgfloatMassMOCATotal inferred mass of original group from MOCA database (mocaMass)solMassphys.massfloat