Nuclear bars and blue nuclei within barred spiral galaxies

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dc.contributor.author Shaw, Martin en_US
dc.contributor.author Axon, David en_US
dc.contributor.author Probst, Ron en_US
dc.contributor.author Gatley, Ian en_US
dc.date.accessioned 2006-05-31T18:39:03Z en_US
dc.date.available 2006-05-31T18:39:03Z en_US
dc.date.issued 1995 en_US
dc.identifier.citation Monthly Notices of the Royal Astronomical Society 274 (1995) 369-387 en_US
dc.identifier.issn 1365-2966 en_US
dc.identifier.uri http://hdl.handle.net/1850/1911 en_US
dc.description Also archived in: arXiv:astro-ph/9412057 v1 16 Dec 1994 en_US
dc.description Polarization profiles of scattered emission lines. II. Upstream dust scattering in the HH 1 jet
dc.description RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
dc.description.abstract Multicolour near IR photometry for a sample of 32 large barred spiral galaxies is presented. By applying ellipse fitting techniques, we identify significant isophote twists with respect to the primary bar axis in the nuclear regions of $\sim$70 \%\ of the sample. These twists are identified in galaxies as late as SBbc and are clearly distinguishable from spiral arm morphology. At most seven of the galaxies with isophote twists are inferred to possess secondary (nuclear) bars, the axis ratios of which appear to correlate with morphological type. The remainder may result from triaxial bulges, or from oblate bulges misaligned with the primary bar. The near IR colour distributions in these data show evidence for (red) circumnuclear star forming rings in 4 galaxies. The majority of the sample (19) also possess striking blue nuclear regions, bluer than typical old stellar populations by $\sim$0.3 mag. in (J--H) and $\sim$0.23 mag. in (H--K). Such blue colours do not appear to correlate with the presence of nuclear rings or pseudo--rings, nor with the activity of the host galaxy (as determined from emission--line spectroscopic characteristics). Several mechanisms to explain this blue colour are considered. (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship We thank Dr. F. Combes and D. Friedli for valuable input. MAS was supported by PPARC throughout the course of this work. We acknowledge support, in the form of data analysis software, provided by the Starlink Project. en_US
dc.format.extent 148173 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Blackwell Publishing: Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries vol. 274 en_US
dc.relation.ispartofseries pps. 369-387 en_US
dc.subject Galaxies-active en_US
dc.subject Galaxies-infrared en_US
dc.subject Galaxies-nuclei en_US
dc.title Nuclear bars and blue nuclei within barred spiral galaxies en_US
dc.type Article en_US

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