J/MNRAS/469/3363ivo://CDS.VizieR/J/MNRAS/469/3363doi:10.26093/cds/vizier.74693363CDSKruk S.J.Lintott C.J.Simmons B.D.Bamford S.P.Cardamone C.N.,Fortson L.Hart R.E.Haussler B.Masters K.L.Nichol R.C.,Schawinski K.Smethurst R.J.2024-08-17T20:19:20Z2020-05-14T08:40:30ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-classification-systemsWe use multiwavelength Sloan Digital Sky Survey (SDSS) images and Galaxy Zoo morphologies to identify a sample of ~270 late-type galaxies with an off-centre bar. We measure offsets in the range 0.2-2.5kpc between the photometric centres of the stellar disc and stellar bar. The measured offsets correlate with global asymmetries of the galaxies, with those with largest offsets showing higher lopsidedness. These findings are in good agreement with predictions from simulations of dwarf-dwarf tidal interactions producing off-centre bars. We find that the majority of galaxies with off-centre bars are of Magellanic type, with a median mass of 10^9.6^M_{sun}_, and 91 per cent of them having M*<3x10^10^M_{sun}_, the characteristic mass at which galaxies start having higher central concentrations attributed to the presence of bulges. We conduct a search for companions to test the hypothesis of tidal interactions, but find that a similar fraction of galaxies with offset bars have companions within 100kpc as galaxies with centred bars. Although this may be due to the incompleteness of the SDSS spectroscopic survey at the faint end, alternative scenarios that give rise to offset bars such as interactions with dark companions or the effect of lopsided halo potentials should be considered. Future observations are needed to confirm possible low-mass companion candidates and to determine the shape of the dark matter halo, in order to find the explanation for the off-centre bars in these galaxies.2017MNRAS.469.3363Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/469/3363CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)J/MNRAS/396/818 : Blue early-type galaxies in Galaxy Zoo (Schawinski+, 2009)J/MNRAS/405/783 : Passive red spirals in Galaxy Zoo (Masters+, 2010)J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)J/MNRAS/420/1684 : End of red sequence galaxies in Galaxy Zoo (Wong+, 2012)J/MNRAS/435/2835 : Morphological types from Galaxy Zoo 2 (Willett+, 2013)J/MNRAS/461/3663 : Galaxy Zoo 2: new classification (Hart+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/469/3363https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/469/3363http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/469/3363https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/469/3363https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/469/3363http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/469/3363GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/469/3363/table1 (Properties of the 271 galaxies in the offset sample, fitted with disc+bar or disc+bar+bulge components)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/3363/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/3363/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/3363/table1?GETtext/xml+votable180.050000true4.3474583-0.52022220.0055555555555555566/4105 4114 4159 4191 4345 4348 4361 4369 4437 4439 4442 4445 4478 4517 4521 4534 4571 4584 4602 4610 4650 4694 4719 4739 4751 4813 4873 4891 4896 4910 4930 4940 4953 4966 4989 4999 5028 5057 5130 5178 5332 5364 5370 5396 5478 5496 5502 5523 5552 5604 5620 5649 5657 5660 5713 5718 5737 5798 5800 5814 5816 5819 5833 5859 5910 5917 5952 5961 5975 5979 6021 6091 6094 6128 6226 6262 6270 6337 6448 6493 6500 6546 6550 6584 6601 6654 6930 6996 7241 7352 7355 7369 7415 7586 8212-8213 8215 8276 8288 8293 8339 8344 8353 8406 8439 8443 8450 8452 8469 8534 8543 8558 8661 8665 8694 8702 8744 8762 8800 8836 8850 8871 8964 9017 9036 9111 9146 9161 9195 9248 9260 9276 9312 9441 9474 9650 9757 9812 9814 9829 9834 9839 9874 9885 9960 9995 10022 10342 10368 10380 10422 10456 10459 10469 10506 10545 10548 10553 10561 10572 10575 10642 10662-10663 10681 10798-10799 10838 10845 10848 10889 10927 10959 10979 11016 11024 11050 11059 11137 11189 11191 11298 11324 11328 11415 11460 11595 11834 11947 17726 17747 17778 17806 17812 17817 18011 18066 18084 18776 19048 19091 22001 23212 25850 25912 25972 26025 26054 26070 26098 26171 26261 26372 26393 26591 26596 26986 26988 27052 27069 27113 27333 27368 27461 27477 27502 27613 27621 27641 27656 27712 27770 27932 27942 27948 28056 28146 28149 28155 28179 28211 28220 28251 28301 28307 28322 28363 28365 28406 28471 28474 28492 28494 28513 28592 30035 31448 31451 31629 31678 31721 31727 317352.85864675833786e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/469/3363?format=asciiOpticaldefaultJ/MNRAS/469/3363/table1Properties of the 271 galaxies in the offset sample, fitted with disc+bar or disc+bar+bulge componentsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzRedshift (from SDSS DR7)src.redshiftfloatrmagr-band apparent Petrosian magnitude (from SDSS DR7)magphot.mag;em.opt.RfloatReDiscDisc effective radiuskpcphys.size.radiusfloatnDiscDisk Sersic index (1)stat.fit.paramfloatReBarBar effective radiuskpcphys.size.radiusfloatnbarBar Sersic index (1)stat.fit.paramfloatReBulgeBulge effective radiuskpcphys.size.radiusfloatnbulgeBulge Sersic index (1)stat.fit.paramfloatlogMass? Average stellar mass (from the MPA-JHU catalogue (Kauffmann et al., 2003MNRAS.341...33K))log(solMass)phys.massfloatnullableA1Amplitude of the first Fourier mode (m=1) (2)src.var.amplitudefloatOff1Offset between the photometric centres of the disc and of the bar in arcsecarcsecpos.angDistancefloatOff2Offset between the photometric centres of the disc and of the bar deprojected using equation (1) (in kpc)kpcpos.angDistancefloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from Name (right ascension part)degpos.eq.ra;meta.main_DEPosition from Name (declination part)degpos.eq.dec;meta.main