Galaxy Zoo: finding offset discs and bars in SDSS galaxies

Abstract We 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 0.2–2.5 kpc between the photometric centres of the stellar disc and stellar bar. The measured off...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2017-08, Vol.469 (3), p.3363-3373
Main Authors: Kruk, Sandor J., Lintott, Chris J., Simmons, Brooke D., Bamford, Steven P., Cardamone, Carolin N., Fortson, Lucy, Hart, Ross E., Häußler, Boris, Masters, Karen L., Nichol, Robert C., Schawinski, Kevin, Smethurst, Rebecca J.
Format: Article
Language:English
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Summary:Abstract We 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 0.2–2.5 kpc 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 109.6 M⊙, and 91 per cent of them having M ⋆ 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stx1026