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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709770.0, MPI für Astronomie / Publikationen_mpia
Spitzer/Infrared Array Camera near-infrared features in the outer parts of S4G galaxies
Authors:Laine, S.; Knapen, J. H.; Muñoz-Mateos, J.-C.; Kim, T.; Comerón, S.; Martig, M.; Holwerda, B. W.; Athanassoula, E.; Bosma, A.; Johansson, P. H.; Erroz-Ferrer, S.; Gadotti, D. A.; de Paz, A. G.; Hinz, J.; Laine, J.; Laurikainen, E.; Menéndez-Delmestre, K.; Mizusawa, T.; Regan, M. W.; Salo, H.; Sheth, K.; Seibert, M.; Buta, R. J.; Cisternas, M.; Elmegreen, B. G.; Elmegreen, D. M.; Ho, L. C.; Madore, B. F.; Zaritsky, D.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:3015
End Page:3039
Audience:Not Specified
Abstract / Description:We present a catalogue and images of visually detected features, such as asymmetries, extensions, warps, shells, tidal tails, polar rings, and obvious signs of mergers or interactions, in the faint outer regions (at and outside of R25) of nearby galaxies. This catalogue can be used in future quantitative studies that examine galaxy evolution due to internal and external factors. We are able to reliably detect outer region features down to a brightness level of 0.03 MJy sr-1 pixel-1 at 3.6 mum in the Spitzer Survey of Stellar Structure in Galaxies (S4G). We also tabulate companion galaxies. We find asymmetries in the outer isophotes in 22 ± 1 per cent of the sample. The asymmetry fraction does not correlate with galaxy classification as an interacting galaxy or merger remnant, or with the presence of companions. We also compare the detected features to similar features in galaxies taken from cosmological zoom re-simulations. The simulated images have a higher fraction (33 per cent) of outer disc asymmetries, which may be due to selection effects and an uncertain star formation threshold in the models. The asymmetries may have either an internal (e.g. lopsidedness due to dark halo asymmetry) or external origin.
Free Keywords:atlases; catalogues; galaxies: interactions; galaxies: peculiar; galaxies: structure; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stu1642
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