J/AJ/149/180ivo://CDS.VizieR/J/AJ/149/180CDSOh S.-H.Hunter D.A.Brinks E.Elmegreen B.G.Schruba A.Walter F.,Rupen M.P.Young L.M.Simpson C.E.Johnson M.C.Herrmann K.A.,Ficut-vicas D.Cigan P.Heesen V.Ashley T.Zhang H.-X.2026-03-18T09:33:57Z2026-03-13T13:34:40ZCDS support team

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

cds-question@unistra.frdwarf-galaxieschemical-abundancesh-i-line-emissionstar-forming-regionsastronomical-modelsvisible-astronomyh-alpha-photometrybroad-band-photometryinfrared-astronomyultraviolet-astronomyWe present high-resolution rotation curves and mass models of 26 dwarf galaxies from "Local Irregulars That Trace Luminosity Extremes, The H_I_ Nearby Galaxy Survey" (LITTLE THINGS). LITTLE THINGS is a high-resolution (~6" angular; <2.6km/s velocity resolution) Very Large Array H_I_ survey for nearby dwarf galaxies in the local volume within 11Mpc. The high-resolution H_I_ observations enable us to derive reliable rotation curves of the sample galaxies in a homogeneous and consistent manner. The rotation curves are then combined with Spitzer archival 3.6um and ancillary optical U, B, and V images to construct mass models of the galaxies. This high quality multi-wavelength data set significantly reduces observational uncertainties and thus allows us to examine the mass distribution in the galaxies in detail. We decompose the rotation curves in terms of the dynamical contributions by baryons and dark matter (DM) halos, and compare the latter with those of dwarf galaxies from THINGS as well as {Lambda}CDM Smoothed Particle Hydrodynamic (SPH) simulations in which the effect of baryonic feedback processes is included. Being generally consistent with THINGS and simulated dwarf galaxies, most of the LITTLE THINGS sample galaxies show a linear increase of the rotation curve in their inner regions, which gives shallower logarithmic inner slopes {alpha} of their DM density profiles. The mean value of the slopes of the 26 LITTLE THINGS dwarf galaxies is {alpha}=-0.32+/-0.24 which is in accordance with the previous results found for low surface brightness galaxies ({alpha}=-0.2+/-0.2) as well as the seven THINGS dwarf galaxies ({alpha}=-0.29+/-0.07). However, this significantly deviates from the cusp-like DM distribution predicted by DM-only {Lambda}CDM simulations. Instead our results are more in line with the shallower slopes found in the {Lambda}CDM SPH simulations of dwarf galaxies in which the effect of baryonic feedback processes is included. In addition, we discuss the central DM distribution of DDO 210 whose stellar mass is relatively low in our sample to examine the scenario of inefficient supernova feedback in low mass dwarf galaxies predicted from recent {Lambda}CDM SPH simulations of dwarf galaxies where central cusps still remain.2015AJ....149..180Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/180CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/128/2170 : H{alpha} imaging of irregular galaxies (Hunter+, 2004)J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006)J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/AJ/141/23 : HI holes in THINGS galaxies (Bagetakos+, 2011)J/MNRAS/416/2401 : HI morphology of 28 THINGS galaxies (Holwerda+, 2011)J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies (Hunter+, 2012)J/AJ/151/136 : LITTLE THINGS dwarf irregular gal. FUV regions (Hunter+, 2016)J/MNRAS/466/1019 : Bright HMXBs in THINGS galaxies (Sazonov+, 2017)J/AJ/157/241 : HI clouds in LITTLE THINGS dwarf irregular gal. (Hunter+, 2019)J/AJ/160/66 : LITTLE THINGS catalog of HI holes in 41 galaxies (Pokhrel+, 2020)J/AJ/161/71 : Parameters for 40 LITTLE THINGS galaxies (Hunter+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/180https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/180http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/180https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/180https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/180http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/180GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/180/galaxies (Properties, tilted-ring parameters, and mass modeling results of the LITTLE THINGS galaxies (Tables 1 & 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/180/galaxies?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/180/galaxies?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/180/galaxies?GETtext/xml+votable180.050000true189.66333332.7613890.0055555555555555566/3042 3389 4522 5978 6399 6502 6560 7523 7769 7799 7878 10762 10881 10970 11019 11120 11143 17165 18041 19990 22495 27351 28149 28510 28610 48942https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/180?format=asciiUVOpticalInfraredRadiodefaultJ/AJ/149/180/galaxiesProperties, tilted-ring parameters, and mass modeling results of the LITTLE THINGS galaxies (Tables 1 & 2)e_PA[0/13.9] PA uncertainty (2)degstat.error;pos.posAngfloati[22.6/82.5] Average value of the kinematic inclination (1)degsrc.orbital.inclination;stat.meanfloate_i[0/15.6] i uncertainty (1)degstat.error;src.orbital.inclinationfloatVMag[-18.2/-10.9] Absolute V magnitude as given in Hunter+2012 (J/AJ/144/134)magphys.magAbs;em.opt.Vfloatf_alpha3.6The dynamical contribution by the stellar component is included in the DM density profile as no Spitzer 3.6mum image is available for this galaxymeta.code;stat.fit.paramcharMgas[0.14/132.52] Gas mass (4)1e+07solMassphys.massfloatMstarK[0.04/20.7]? Stellar mass derived from the kinematic analysis (5)1e+07solMassphys.massfloatnullableMstarSED[0.06/46.7]? Stellar mass derived using a spectral energy distribution fitting technique in Zhang+2012 (2012AJ....143...47Z)1e+07solMassphys.massfloatnullablelog(Mdyn)[6.9/9.93] Log of dynamical mass measured using Viso(Rmax) and Rmaxlog(solMass)phys.massfloatlog(M200)[8.7/510.2] CDM halo mass estimated from V200M07 (6)log(solMass)phys.massfloatCatLTLink to the LITTLE THINGS catalog (J/AJ/144/134) datameta.numberintnullableRotDMbarRotation curve (DM + baryons)meta.ref.urlcharRotDMRotation curve (DM only)meta.ref.urlcharDensDMbarDensity profile (DM + baryons)meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullableNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (1)pos.eq.dec;meta.mainDist[0.7/10.3] Distance as given in Hunter+2012 (J/AJ/144/134)Mpcpos.distancefloatVsys[-348/589.4] Systemic velocity (1)km/sphys.velocfloate_Vsys[0.7/5.6] Vsys uncertainty (1)km/sstat.error;phys.velocfloatPA[8.2/359.6] Average value of the kinematic position angle (2)degpos.posAng;stat.meanfloatAb(O/H)[7.2/8.7] 12+log(O/H) ; Oxygen abundance taken from the literature as compiled in Hunter+2012 (J/AJ/144/134)phys.abundfloate_Ab(O/H)[0.01/0.2]? Ab(O/H) uncertaintystat.error;phys.abundfloatnullablelog(SFR)Ha[-4.1/0.19]? H{alpha} star formation rates normalized to the area ({pi}R^2^ where R is the disk scale length) as given in Hunter+2004 (J/AJ/128/2170)solMass.yr**-1.kpc**-2phys.SFRfloatnullablee_log(SFR)Ha[0.01/0.07]? log(SFR)Ha uncertaintysolMass.yr**-1.kpc**-2stat.error;phys.SFRfloatnullablelog(SFR)FUV[-3.21/-0.01]? GALEX FUV star formation rates normalized to the area ({pi}R^2^ where R is the disk scale length) as given in Hunter+2010 (2010AJ....139..447H)solMass.yr**-1.kpc**-2phys.SFRfloatnullablee_log(SFR)FUV[0/0.06]? log(SFR)FUV uncertaintysolMass.yr**-1.kpc**-2stat.error;phys.SFRfloatnullableRmax[0.31/9.81] Radius where the outermost part of the rotation curve is measuredkpcphys.size.radiusfloatR0.3[0.2/5.43] Radius where the logarithmic slope of the total rotation curve dlog(V)/dlog(R)=0.3kpcphys.size.radiusfloatV(Rmax)[12/125.5] Rotation velocity (asymmetric drift corrected) at Rmaxkm/sphys.veloc.rotatfloatViso(Rmax)[11.3/130.2] Rotation velocity of the best fitted pseudo-isothermal halo model at Rmaxkm/sphys.veloc.rotat;meta.modelledfloatRmax/HI[6/103.8] Ratio of Rmax to H_I_ beam sizephys.size;arith.ratiofloatz0[0.07/0.48]? Vertical scale height of the stellar diskkpcphys.sizefloatnullablec[-0.4/25] Concentration parameterstat.paramfloate_c[0.2/1503.4]? c uncertainty (1)stat.error;stat.paramfloatnullablecM07[8.1/18.6] Concentration parameter derived using an empirical relationship between c and V200 as given by McGaugh+2007 (2007ApJ...659..149M)stat.param;meta.modelledfloatV200[5.4/2290.8] Rotation velocity for a NFW model (2)km/sphys.veloc.rotat;meta.modelledfloate_V200[0.9/48442.1]? V200 uncertainty (1)km/sstat.error;phys.veloc.rotat;meta.modelledfloatnullableV200M07[12.4/598.2]? V200 values fitted after fixing c to cM07 assuming a "minimum disk" (2)km/sphys.veloc.rotat;meta.modelledfloatnullablee_V200M07[0.2/30.4]? V200M07 uncertaintykm/sstat.error;phys.veloc.rotat;meta.modelledfloatnullableRc[0.15/8.4] Core radius of pseudo-isothermal model (Begeman+1991, 1991MNRAS.249..523B)kpcphys.size.radius;meta.modelledfloate_Rc[0.01/12.2] Rc uncertaintykpcstat.error;phys.size.radius;meta.modelledfloatrho0[8.19/2132.4] Core density of pseudo-isothermal model (Begeman+1991, 1991MNRAS.249..523B)0.001solMass.pc**-3phys.density;meta.modelledfloate_rho0[0.77/381.14] rho0 uncertainty0.001solMass.pc**-3stat.error;phys.density;meta.modelledfloatalphamin[-1.25/1.16] Logarithmic inner slope of the total matter (DM halo+baryons) density profiles (3)stat.fit.paramfloate_alphamin[0.01/1.22] alphamin uncertaintystat.error;stat.fit.paramfloatalpha3.6[-1.25/0.97] Logarithmic inner slope of the DM density profiles (3)stat.fit.paramfloate_alpha3.6[0.01/0.92] alpha3.6 uncertaintystat.error;stat.fit.paramfloatDensDMDensity profile (DM only)meta.ref.urlcharNameMain name of the sourcemeta.id;meta.maincharprimaryf_alphaminThe dynamical contribution by the stellar component is included in the DM density profile as no Spitzer 3.6mum image is available for this galaxymeta.code;stat.fit.paramcharJ/AJ/149/180/rotdmbarRotation curves (DM + baryons) of the sample galaxies (Data behind Figures 2.A, 3.A, & 4.A)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy identifiermeta.id;meta.maincharTypeData type (1)meta.codecharR0.3Radius where the logarithmic slope of the total rotation curve dlog(V)/dlog(R)=0.3kpcphys.size.radiusdoubleV0.3Rotation velocity at R0.3km/sphys.veloc.rotatdoubleRRadius scaled by R0.3phys.size.radiusdoubleVVelocity scaled by V0.3phys.veloc.rotatdoublee_VUncertainty in Vstat.error;phys.veloc.rotatdoubleJ/AJ/149/180/dendmbarDensity profiles (DM + baryons) of the sample galaxies (Data behind Figures 2.B, 3.B, & 4.B)NameGalaxy identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeData type (1)meta.codecharRLog radius scaled by R0.3phys.size.radiusdoublerhoLog density scaled by {rho}0.3phys.densitydoublee_rhoUncertainty in rhostat.error;phys.densityfloatJ/AJ/149/180/rotdmRotation curves (DM only) of the galaxies (Data behind Figures 2.C, 3.C, & 4.C)NameGalaxy identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeData type (1)meta.codecharR0.3Radius where the logarithmic slope of the total rotation curve dlog(V)/dlog(R)=0.3kpcphys.size.radiusdoubleV0.3Rotation velocity at R0.3km/sphys.veloc.rotatdoubleRRadius scaled by R0.3phys.size.radiusdoubleVVelocity scaled by V0.3phys.veloc.rotatdoublee_VUncertainty in Vstat.error;phys.veloc.rotatdoubleJ/AJ/149/180/dendmDensity profiles (DM only) of the galaxies (Data behind Figures 2.D, 3.D, & 4.D)NameGalaxy identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeData type (1)meta.codecharRLog radius scaled by R0.3phys.size.radiusdoublerhoLog density scaled by {rho}0.3phys.densitydoublee_rhoUncertainty in rhostat.error;phys.densityfloatJ/AJ/149/180/nfwacThe CDM NFW dark matter model rotation curves (Data behind Figures 2, 3, and 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcModel concentration parameterphys.size;arith.ratiofloatV200Model rotation velocity at R_200_; see Equ. 7km/sphys.veloc.rotat;meta.modelledintRModel radius scaled by R0.3phys.size.radiusdoubleVModel rotation velocity scaled by V0.3 (1)phys.veloc.rotat;meta.modelleddoublee_VUncertainty in Vstat.error;phys.veloc.rotat;meta.modelleddoubleJ/AJ/149/180/nfwbdThe CDM NFW dark matter model density profiles (Data behind Figures 2, 3, and 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcModel concentration parameterphys.size;arith.ratiofloatV200Model rotation velocity at R_200_km/sphys.veloc.rotat;meta.modelledintRModel log radius scaled by R0.3phys.size.radiusdoublerhoModel log density scaled by {rho}0.3 (1)phys.density;meta.modelleddoublee_rhoUncertainty in rhostat.error;phys.density;meta.modelledfloat