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Morphological fractions of galaxies in WINGS clusters: revisiting the morphology-density paradigm

Fasano, G. ; Poggianti, B. M. ; Bettoni, D. ; D'Onofrio, M. ; Dressler, A. ; Vulcani, B. ; Moretti, A. ; Gullieuszik, M. ; Fritz, J. ; Omizzolo, A. ; Cava, A. ; Couch, W. J. ; Ramella, M. ; Biviano, A.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 449, no. 4, p. 3927-3944

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    Titre
    • Morphological fractions of galaxies in WINGS clusters: revisiting the morphology-density paradigm
    Auteur
    • Fasano, G.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • Poggianti, B. M.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • Bettoni, D.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • D'Onofrio, M.. Dip. di Fisica e Astronomia G. Galilei, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy
    • Dressler, A.. The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USA
    • Vulcani, B.. Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, the University of Tokyo, Kashiwa 277-8582, Japan
    • Moretti, A.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • Gullieuszik, M.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • Fritz, J.. Centro de Radioastronomìa y Astrofìsica, CRyA, UNAM, Campus Morelia, A.P. 3-72, C.P. 58089 Michoacàn, Mexico
    • Omizzolo, A.. INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    • Cava, A.. Observatoire de Genève, Universitè de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland
    • Couch, W. J.. Center for Astrophysics, Swinburne University of Technology, Hawthorn VIC 3122, Australia
    • Ramella, M.. INAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy
    • Biviano, A.. INAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 449, no. 4, p. 3927-3944. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:296400
    Summary
    We present the morphology-density and morphology-radius relations (T-Σ and T-R, respectively) obtained from the WIde-field Nearby Galaxy-cluster Survey (WINGS) data base of galaxies in nearby clusters. Aiming to achieve the best statistics, we exploit the whole sample of galaxies brighter than MV = −19.5 (5504 objects), stacking up the 76 clusters of the WINGS survey altogether. Using this global cluster sample, we find that the T-Σ relation holds only in the inner cluster regions (R<1/3 R200), while the T-R relation keeps almost unchanged over the whole range of local density. A couple of tests and two sets of numerical simulations support the robustness of these results against the effects of the limited cluster area coverage of the WINGS imaging. The above mentioned results hold for all cluster masses (X-ray luminosity and velocity dispersion) and all galaxy stellar masses (M*). The strength of the T-Σ relation (where present) increases with increasing M*, while this effect is not found for the T-R relation. Noticeably, the absence/presence of subclustering determines the presence/absence of the T-Σ relation outside the inner cluster regions, leading us to the general conclusion that the link between morphology and local density is preserved just in dynamically evolved regions. We hypothesize that some mechanism of morphological broadening/redistribution operates in the intermediate/outer regions of substructured (‘non-relaxed') clusters, producing a strong weakening of the T-Σ relation