J/A+A/647/A76ivo://CDS.VizieR/J/A+A/647/A76doi:10.26093/cds/vizier.36470076CDSMancera PinaP.E.Posti L.Fraternali F.Adams E.A.K.Oosterloo T.2021-07-16T11:00:22Z2021-03-10T08:25:46ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-classification-systemsSpecific angular momentum (the angular momentum per unit mass, j=J/M) is one of the key parameters that control the evolution of galaxies, and it is closely related with the coupling between dark and visible matter. In this work, we aim to derive the baryonic (stars plus atomic gas) specific angular momentum of disc galaxies and study its relation with the dark matter specific angular momentum. Using a combination of high-quality HI rotation curves, HI surface densities, and near-infrared surface brightness profiles, we homogeneously measure the stellar (j*) and gas (jgas) specific angular momenta for a large sample of nearby disc galaxies. This allows us to determine the baryonic specific angular momentum (jbar) with high accuracy and across a very wide range of masses. We confirm that the j*-M* relation is an unbroken power-law from 7<~log(M*/M_{sun}_)<~11.5, with a slope 0.54+/-0.02, setting a stronger constraint at dwarf galaxy scales than previous determinations. Concerning the gas component, we find that the jgas-Mgas relation is also an unbroken power-law from 6<~log(Mgas/M_{sun}_)<~11, with a steeper slope of 1.01+/-0.04. Regarding the baryonic relation, our data support a correlation characterized by a single power-law with a slope 0.58+/-0.02. Our analysis shows that our most massive spirals and smallest dwarfs lie along the same jbar-Mbar sequence. While the relations are tight and unbroken, we find internal correlations inside them: At fixed M, galaxies with larger j have larger disc scale lengths, and at fixed Mbar, gas-poor galaxies have lower jbar than expected. We estimate the retained fraction of baryonic specific angular momentum, f_jbar_, finding it constant across our entire mass range with a value of 0.7, indicating that the baryonic specific angular momentum of present-day disc galaxies is comparable to the initial specific angular momentum of their dark matter haloes. 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Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharMstarStellar masssolMassphys.massdoublee_MstarUncertainty in MstarsolMassstat.errordoubleMgasGas masssolMassphys.massdoublee_MgasUncertainty in MgassolMassstat.errordoubleMbarBaryonic masssolMassphys.massdoublee_MbarUncertainty in MbarsolMassstat.errordoublejstar? Stellar specific angular momentumphys.angMomentumfloatnullablee_jstar? Uncertainty in jstarstat.errorfloatnullablejgasGas specific angular momentumphys.angMomentumfloate_jgasUncertainty in jgasstat.errorfloatjbar? Baryonic specific angular momentumphys.angMomentumfloatnullablee_jbar? Uncertainty in jbarstat.errorfloatnullableRdOptical exponential disc scale lengthkpcphys.size.radiusfloatrstar? Convergence factor in jstarstat.fit.paramfloatnullablergasConvergence factor in jgasstat.fit.paramfloatrbar? Convergence factor in jbarstat.fit.paramfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable