J/MNRAS/494/2600ivo://CDS.VizieR/J/MNRAS/494/2600doi:10.26093/cds/vizier.74942600CDSNeuzil M.K.Mansfield P.Kravtsov A.V.2024-09-02T20:15:52Z2023-07-28T14:52:29ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryradial-velocityvisible-astronomyWe quantify the shape and overdensity of the galaxy distribution in the 'Local Sheet' within a sphere of R=8Mpc and compare these properties with the expectations of the {Lambda}CDM model. We measure ellipsoidal axis ratios of c/a~0.16 and b/a~0.79, indicating that the distribution of galaxies in the Local Volume can be approximated by a flattened oblate ellipsoid, consistent with the 'sheet'-like configuration noted in previous studies. In contrast with previous estimates that the Local Sheet has a density close to average, we find that the number density of faint and bright galaxies in the Local Volume is ~1.7 and ~5.2 times denser, respectively, than the mean number density of galaxies of the same luminosity. Comparison with simulations shows that the number density contrasts of bright and faint galaxies within 8Mpc alone make the Local Volume a ~2.5{sigma} outlier in the {Lambda}CDM cosmology. Our results indicate that the cosmic neighbourhood of the Milky Way may be unusual for galaxies of similar luminosity. The impact of the peculiar properties of our neighbourhood on the properties of the Milky Way and other nearby galaxies is not yet understood and warrants further study.2020MNRAS.494.2600Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/494/2600CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/145/101 : Updated nearby galaxy catalog (Karachentsev+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/494/2600https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/494/2600http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/494/2600https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/494/2600https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/494/2600http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/494/2600GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/494/2600/table1 (Updated LVG catalog with total magnitudes B_T_, extinctions and distances from the literature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/494/2600/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/2600/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/2600/table1?GETtext/xml+votable180.050000true2.4855917-24.96313060.0055555555555555566/396 597 739 764 816 955 1768 2031 2121 2130 2155 2169 2282 2320 2382 2409 2417 2622 2709 3042 3250 3278 3299 3304 3381 3389 3483 3506 3558 3699 4181 4511 5061 5067 5116 5132 5142 5174 5241 5283 5329 5504 5710 5715 5975 5978 5995 6502 6560 6604-6605 6619 6623 6649 6773 6791 6981 7242 7602 7604 7606-7607 7624 7743 7799 7878 7941 10755 10761 10769 10787 10799 10818 10840-10841 10847 10856 10888 10896-10898 10900-10901 10905 10908 10910-10911 10930 10935 10941 10954 10959 10976-10977 10979 10998 11006 11019 11027 11030 11092 11127 11140 11143 11227 11232 11270 11434 11448 11639 11933 11961 13667-13668 13672 15558 15560 15585 15590 15592 16441 16595 16605 16655 16701 16779 18398 18419 18429 18649 18739 20510 20532 20769 20809 20929 20931 20964 21026-21027 21362-21363 21439 22427 22495 22751 22995 23634 23684 24437 24912 24952 24956 25077 25079 25083 25344 25761 26136 26148 26265 26315 26329-26330 26362 26803 26814 27030 27152 27465 27512 27514-27515 27518 27568 27604 27643 27729 27862 27916 27937 28015 28077 28087 28091 28151 28156 28167 28172 28200 28247 28468 28486 28495-28496 28510 28517-28518 28521 28524 28535 28610 28630-28631 29718 30954 33096 33193 33271 33277 33317 33571 33655-33656 33685 33986 34189 34471 34476 34641 34755 35214 35243 35514 35536 36164 36247 36900 36974 38329 38390 38437 38846 38872 39800 39909 40111 40124 40156 40158 40160 40199 40323 40328 41122 41432 41586 41849 41946 41949 41968 41987 43120 43222 43231 43233 43245 43262 43420 43605 43797 43809 43845 43874 43878 43881 45305 45674 45732 45746 45748 45777 45914 46460 46492 46545 46549 46597 466604.0234554602041486e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/494/2600?format=asciiOpticaldefaultJ/MNRAS/494/2600/table1Updated LVG catalog with total magnitudes B_T_, extinctions and distances from the literatureSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharBTmagTotal Vega B-band magnitudemagphot.mag;em.opt.BfloatABgGalactic B-band extinctionmagphys.absorptionfloatABi? Internal B-band extinctionmagphys.absorptionfloatnullablef_BTmagFlag indicating the method used to obtain BTmag (1)meta.codeintr_BTmagBibCode of the source paper for BTmagmeta.refcharmuBest-fitting distance modulusmagphot.mag.distModfloate_mu? Statistical error on mumagstat.errorfloatnullablef_muFlag indicating the method used to measure the distance (2)meta.codecharesmu? Estimated systematic error due to a lack of homogenization for the given distance method (2)magstat.errorfloatnullablenxX coordinate of the unit vector pointing from Earth to the galaxy in supergalactic coordinatespos.cartesian.x;pos.supergalacticfloatnyY coordinate of the unit vector pointing from Earth to the galaxy in supergalactic coordinatespos.cartesian.y;pos.supergalacticfloatnzZ coordinate of the unit vector pointing from Earth to the galaxy in supergalactic coordinatespos.cartesian.z;pos.supergalacticfloata26.5? Major axis of the 26.5mag/arcsec^2^ Holmberg isophote of the galaxy (3)arcminphys.angSizefloatnullableb/a? b/a axis ratio of the Holmberg isophotephys.angSize;arith.ratiofloatnullableW50? 50% HI linewidth of the galaxykm/sspect.line.widthfloatnullableMorphHubble morphological index of the galaxymeta.code;src.morph.typeintRV? Radial velocity of the galaxy relative to the centroid of the Local Groupkm/sspect.dopplerVelocfloatnullable_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