Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-55361
Tortora, C; Napolitano, N R; Romanowsky, A J; Jetzer, P; Cardone, V F; Capaccioli, M (2011). Stellar mass-to-light ratio gradients in galaxies: correlations with mass. Monthly Notices of the Royal Astronomical Society, 418(3):1557-1564.
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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.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Dewey Decimal Classification:||530 Physics|
|Deposited On:||18 Feb 2012 16:10|
|Last Modified:||04 Feb 2014 08:11|
|ISSN:||0035-8711 (P) 1365-2966 (E)|
|Additional Information:||The definitive version is available at www3.interscience.wiley.com|
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