TY - JOUR
T1 - Spitzer/Infrared Array Camera near-infrared features in the outer parts of S4G galaxies
AU - Laine, Seppo
AU - Knapen, Johan H.
AU - Muñoz-Mateos, Juan Carlos
AU - Kim, Taehyun
AU - Comerón, Sébastien
AU - Martig, Marie
AU - Holwerda, Benne W.
AU - Athanassoula, E.
AU - Bosma, Albert
AU - Johansson, Peter H.
AU - Erroz-Ferrer, Santiago
AU - Gadotti, Dimitri A.
AU - De Paz, Armando Gil
AU - Hinz, Joannah
AU - Laine, Jarkko
AU - Laurikainen, Eija
AU - Menéndez-Delmestre, Karín
AU - Mizusawa, Trisha
AU - Regan, Michael W.
AU - Salo, Heikki
AU - Sheth, Kartik
AU - Seibert, Mark
AU - Buta, Ronald J.
AU - Cisternas, Mauricio
AU - Elmegreen, Bruce G.
AU - Elmegreen, Debra M.
AU - Ho, Luis C.
AU - Madore, Barry F.
AU - Zaritsky, Dennis
N1 - Publisher Copyright:
© 2014.
PY - 2014/3/19
Y1 - 2014/3/19
N2 - 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 μm 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.
AB - 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 μm 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.
KW - Atlases - catalogues - galaxies
KW - Galaxies
KW - Interactions - galaxies
KW - Peculiar - galaxies
KW - structure - infrared
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U2 - 10.1093/mnras/stu1642
DO - 10.1093/mnras/stu1642
M3 - Article
AN - SCOPUS:84922250638
SN - 0035-8711
VL - 444
SP - 3015
EP - 3039
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -