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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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Abstract

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.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Theoretical Physics
DDC:530 Physics
Language:English
Date:December 2011
Deposited On:18 Feb 2012 17:10
Last Modified:04 Feb 2014 09:11
Publisher:Wiley-Blackwell
ISSN:0035-8711 (P) 1365-2966 (E)
Additional Information:The definitive version is available at www3.interscience.wiley.com
Publisher DOI:10.1111/j.1365-2966.2011.19438.x
Related URLs:http://arxiv.org/abs/1107.2918
Citations:Web of Science®. Times Cited: 5
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