Morphology of 15 southern early-type disk galaxies

dc.contributor.authorLaurikainen, Eija
dc.contributor.authorSalo, Heikki
dc.contributor.authorButa, Ronald
dc.contributor.authorKnapen, Johan
dc.contributor.authorSpeltincx, Tom
dc.contributor.authorBlock, David
dc.contributor.otherUniversity of Oulu
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUniversity of Hertfordshire
dc.contributor.otherUniversity of Witwatersrand
dc.date.accessioned2019-06-13T19:02:23Z
dc.date.available2019-06-13T19:02:23Z
dc.date.copyright2006
dc.date.issued2006-11-06
dc.description.abstractStructural analysis has been performed for a sample of 15 southern early-type disk galaxies, mainly S0 galaxies, using high-resolution K(s)-band images. The galaxies are mostly barred, and many of them show multiple structures including bars and ovals, typical for S0 galaxies. The new images are of sufficient quality to reveal new detail of the morphology of the galaxies. For example, we report a hitherto undetected nuclear ring in NGC 1387, a nuclear bar in NGC 1326, and in the residual image a weak primary bar in NGC 1317. For the galaxies we (1) measure the radial profiles of the orientation parameters derived from the elliptical isophotes, (2) apply Fourier methods for calculating tangential forces, and, in particular, ( 3) apply structural decomposition methods. For galaxies with multiple structures a two-dimensional method is found to be superior to a one-dimensional method but only if in addition to the bulge and the disk at least one other component is taken into account. We find strong evidence of pseudobulges in S0 galaxies: 10 of the galaxies have a shape parameter of the bulge near n = 2, indicating that the bulges are more disklike than following the R(1/4) law. Also, six of the galaxies have either nuclear rings, nuclear bars, or nuclear disks. In all non-elliptical galaxies in our sample the bulge-to-total (B/T) flux ratio is less than 0.4, as is typically found in galaxies having pseudobulges. In two of the galaxies the B/T flux ratio is as small as in typical Sc-type spiral galaxies. This might be the hitherto undiscovered link in the scenario in which spiral galaxies are transformed into S0 galaxies. Also, bars in S0 systems are found to be shorter and less massive and to have smaller bar torques than bars in S0/a-type galaxies.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationLaurikainen, E., et al. (2006): Morphology of 15 Southern Early-Type Disk Galaxies. The Astronomical Journal, 132(6). DOI: 10.1086/508810
dc.identifier.doi10.1086/508810
dc.identifier.orcidhttps://orcid.org/0000-0003-1643-0024
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5747
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.rights.holderAmerican Astronomical Society
dc.subjectgalaxies : elliptical and lenticular, cD
dc.subjectgalaxies : evolution
dc.subjectgalaxies : structure
dc.subjectHUBBLE-SPACE-TELESCOPE
dc.subjectCIRCUMNUCLEAR STAR-FORMATION
dc.subjectNEARBY SEYFERT-GALAXIES
dc.subjectH-II REGIONS
dc.subjectSPIRAL GALAXIES
dc.subjectBARRED GALAXIES
dc.subjectSURFACE PHOTOMETRY
dc.subjectRESONANCE RING
dc.subjectDARK-MATTER
dc.subjectSECULAR EVOLUTION
dc.subjectAstronomy & Astrophysics
dc.titleMorphology of 15 southern early-type disk galaxiesen_US
dc.typetext
dc.typeArticle
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