J/MNRAS/493/5089ivo://CDS.VizieR/J/MNRAS/493/5089doi:10.26093/cds/vizier.74935089CDSReynolds T.N.Westmeier T.Staveley-Smith L.Chauhan G.Lagos C.D.P.2024-08-20T20:16:51Z2023-07-26T07:44:22ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxy-groupsgalaxiesradio-astronomyh-i-line-emissionspectroscopyWe present an analysis of morphological, kinematic, and spectral asymmetries in observations of atomic neutral hydrogen (HI) gas from the Local Volume HI Survey (LVHIS), the VLA Imaging of Virgo in Atomic Gas (VIVA) survey, and the Hydrogen Accretion in Local Galaxies Survey. With the aim of investigating the impact of the local environment density and stellar mass on the measured HI asymmetries in future large HI surveys, we provide recommendations for the most meaningful measures of asymmetry for use in future analysis. After controlling for stellar mass, we find signs of statistically significant trends of increasing asymmetries with local density. The most significant trend we measure is for the normalized flipped spectrum residual (A_spec_), with mean LVHIS and VIVA values of 0.204+/-0.011 and 0.615+/-0.068 at average weighted 10th nearest-neighbour galaxy number densities of log({rho}_10_/Mpc^-3^) =-1.64 and 0.88, respectively. Looking ahead to the Widefield ASKAP L-band Legacy All-sky Blind survey on the Australian Square Kilometre Array Pathfinder, we estimate that the number of detections will be sufficient to provide coverage over 5 orders of magnitude in both local density and stellar mass increasing the dynamic range and accuracy with which we can probe the effect of these properties on the asymmetry in the distribution of atomic gas in galaxies.2020MNRAS.493.5089Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/5089CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/478/1611 : Local Volume H I Survey (LVHIS) (Koribalski+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/5089https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/5089http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/5089https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/5089https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/5089http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/5089GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/5089/tablea1 (Asymmetry parameters for LVHIS galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/5089/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/5089/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/5089/tablea1?GETtext/xml+votable180.050000true2.0558333-34.57805560.005555555555555556Cone search capability for table J/MNRAS/493/5089/tablea2 (Asymmetry parameters for VIVA galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/5089/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/5089/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/5089/tablea2?GETtext/xml+votable180.050000true181.046629218.443450.005555555555555556Cone search capability for table J/MNRAS/493/5089/tablea3 (Asymmetry parameters for HALOGAS galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/5089/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/5089/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/5089/tablea3?GETtext/xml+votable180.050000true123.311012545.98979170.0055555555555555566/5751 6604-6605 6619 10761 10841 10847 10888 10897 10977 11030 11448 16414 16441 16459 16519 16544 16655 16701 20510 20532 24602 24632 24713 24715 26271 26309 26323 26331 26338 26343 26351 26365 27728 27731 27738 27741 27763 27766-27767 27773 27857 27861-27862 27901 27913-27914 27917-27918 27937 27942 27945 27947 27955 28033 28035-28036 28038-28039 28045-28046 28054 28141 28496 28498 28517 28529 28612 33193 33571 33655-33656 33685 33742 33986 34189 35206 35214 35243 35514 35536 36974 37437 38102 38259 38329 38390 38673 38941 39043 39575 41122 41132 41432 41586 41760 41849 41917 41946 41949 41987 43100 43231 43233 43293 43307 43333 43420 43427 43430 43438 43451 43605 43634 43706 43727 43763 43797 43809 43874 43878 43881 43883-43884 43921 43924-43925 43972 45305 46339 46597 47952https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/5089?format=asciiRadiodefaultJ/MNRAS/493/5089/tablea1Asymmetry parameters for LVHIS galaxiesNameGalaxy name (LVHISNNN)meta.id;meta.maincharlogrhoLogarithm of the environment density computed using the 10 nearest neighbours (Section 2.4)log(Mpc**-3)phys.density;meta.modelledfloatlogMass? Logarithm of the stellar masslog(solMass)phys.massfloatnullableAspec? Spectrum residual (G1)phot.flux;arith.ratiofloatnullableDVsysDifference between the flux weighted mean systemic velocity and the systemic velocity defined as the mid-point of the spectrum at 50% of the spectrum's peak height (Section 3.1.1)km/sphys.veloc;arith.diffintDVsysopt? Difference between the flux weighted mean systemic velocity from the HI spectrum and the optical velocity (Section 3.1.1)km/sphys.veloc;arith.diffintnullableSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAflux? Ratio of the integrated flux in the left and right halves of the spectrum divided at the systemic velocity (Section 3.1.2)phot.flux;arith.ratiofloatnullableApeak? Ratio between the left and right peaks of the spectrum (Section 3.1.3)phot.flux;arith.ratiofloatnullableAmap? Bias corrected asymmetry parameter of integrated intensity (moment 0) map (Section 3.2.1)src.morph.paramfloatnullable<A1>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii smaller than the optical radius (Section 3.2.2)stat.fit.paramfloatnullable<A2>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii larger than the optical radius (Section 3.2.2)stat.fit.paramfloatnullableAvel? Velocity asymmetry parameter (G2)src.morph.paramfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/493/5089/tablea2Asymmetry parameters for VIVA galaxiesSimbadSimbad column added by the CDSmeta.ref.urlcharAvel? Velocity asymmetry parameter (G2)src.morph.paramfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name (NGCNNNN)meta.id;meta.maincharlogrhoLogarithm of the environment density computed using the 10 nearest neighbours (Section 2.4)log(Mpc**-3)phys.density;meta.modelledfloatlogMass? Logarithm of the stellar masslog(solMass)phys.massfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainDVsysDifference between the flux weighted mean systemic velocity and the systemic velocity defined as the mid-point of the spectrum at 50% of the spectrum's peak height (Section 3.1.1)km/sphys.veloc;arith.diffintDVsysopt? Difference between the flux weighted mean systemic velocity from the HI spectrum and the optical velocity (Section 3.1.1)km/sphys.veloc;arith.diffintnullableAspecSpectrum residual (G1)phot.flux;arith.ratiofloatAfluxRatio of the integrated flux in the left and right halves of the spectrum divided at the systemic velocity (Section 3.1.2)phot.flux;arith.ratiofloatApeak? Ratio between the left and right peaks of the spectrum (Section 3.1.3)phot.flux;arith.ratiofloatnullableAmapBias corrected asymmetry parameter of integrated intensity (moment 0) map (Section 3.2.1)src.morph.paramfloat<A1>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii smaller than the optical radius (Section 3.2.2)stat.fit.paramfloatnullable<A2>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii larger than the optical radius (Section 3.2.2)stat.fit.paramfloatnullableJ/MNRAS/493/5089/tablea3Asymmetry parameters for HALOGAS galaxiesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name (NGCNNNN)meta.id;meta.maincharlogrhoLogarithm of the environment density computed using the 10 nearest neighbours (Section 2.4)log(Mpc**-3)phys.density;meta.modelledfloatlogMass? Logarithm of the stellar masslog(solMass)phys.massfloatnullableDVsysDifference between the flux weighted mean systemic velocity and the systemic velocity defined as the mid-point of the spectrum at 50% of the spectrum's peak height (Section 3.1.1)km/sphys.veloc;arith.diffintDVsysopt? Difference between the flux weighted mean systemic velocity from the HI spectrum and the optical velocity (Section 3.1.1)km/sphys.veloc;arith.diffintnullableAspecSpectrum residual (G1)phot.flux;arith.ratiofloatAfluxRatio of the integrated flux in the left and right halves of the spectrum divided at the systemic velocity (Section 3.1.2)phot.flux;arith.ratiofloatApeak? Ratio between the left and right peaks of the spectrum (Section 3.1.3)phot.flux;arith.ratiofloatnullableAmapBias corrected asymmetry parameter of integrated intensity (moment 0) map (Section 3.2.1)src.morph.paramfloat<A1>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii smaller than the optical radius (Section 3.2.2)stat.fit.paramfloatnullable<A2>? Mean first harmonic coefficient from Fourier analysis of moment 0 map over radii larger than the optical radius (Section 3.2.2)stat.fit.paramfloatnullableAvel? Velocity asymmetry parameter (G2)src.morph.paramfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main