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Stellar mass-to-light ratio gradients in galaxies: correlations with mass

Tortora, C. ; Napolitano, N. R. ; Romanowsky, A. J. ; Jetzer, Ph ; Cardone, V. F. ; Capaccioli, M.

In: Monthly Notices of the Royal Astronomical Society, 2011, vol. 418, no. 3, p. 1557-1564

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    Titre
    • Stellar mass-to-light ratio gradients in galaxies: correlations with mass
    Auteur
    • Tortora, C.. Universität ürich, Institut für Theoretische Physik, Winterthurerstrasse 190, CH-8057 ürich, Switzerland
    • Napolitano, N. R.. INAF - Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, 80131 Napoli, Italy
    • Romanowsky, A. J.. UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA
    • Jetzer, Ph. Universität ürich, Institut für Theoretische Physik, Winterthurerstrasse 190, CH-8057 ürich, Switzerland
    • Cardone, V. F.. INAF - Osservatorio Astronomico di Roma - via di Frascati, 33, 00040 Monte Porzio Catone (Roma), Italy
    • Capaccioli, M.. Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Compl. Univ. Monte S. Angelo, 80126 Napoli, Italy
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2011, vol. 418, no. 3, p. 1557-1564. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:301333
    Summary
    We analyse the stellar mass-to-light ratio (M/L) gradients in a large sample of local galaxies taken from the Sloan Digital Sky Survey, spanning a wide range of stellar masses and morphological types. As suggested by the well-known relationship between M/L values and colours, we show that M/L gradients are strongly correlated with colour gradients, which we trace to the effects of age variations. Stellar M/L gradients generally follow patterns of variation with stellar mass and galaxy type that were previously found for colour and metallicity gradients. In late-type galaxies M/L gradients are negative, steepening with increasing mass. In early-type galaxies M/L gradients are shallower, while presenting a twofold trend: they decrease with mass up to a characteristic mass of and increase at larger masses. We compare our findings with other analyses and discuss some implications for galaxy formation and for dark matter estimates