Morpho kinematic properties of field S0 bulges in the CALIFA survey
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We study a sample of 28 S0 galaxies extracted from the integral field spectroscopic (IFS) survey Calar Alto Legacy Integral Field Area. We combine an accurate two-dimensional (2D) multicomponent photometric decomposition with the IFS kinematic properties of their bulges to understand their formation scenario. Our final sample is representative of S0s with high stellar masses (M-*/M-circle dot > 10(10)). They lay mainly on the red sequence and live in relatively isolated environments similar to that of the field and loose groups. We use our 2D photometric decomposition to define the size and photometric properties of the bulges, as well as their location within the galaxies. We perform mock spectroscopic simulations mimicking our observed galaxies to quantify the impact of the underlying disc on our bulge kinematic measurements (lambda and upsilon/sigma). We compare our bulge corrected kinematic measurements with the results from Schwarzschild dynamical modelling. The good agreement confirms the robustness of our results and allows us to use bulge deprojected values of lambda and upsilon/sigma. We find that the photometric (n and B/T) and kinematic (upsilon/sigma and lambda) properties of our field S0 bulges are not correlated. We demonstrate that this morpho-kinematic decoupling is intrinsic to the bulges and it is not due to projection effects. We conclude that photometric diagnostics to separate different types of bulges (disc-like versus classical) might not be useful for S0 galaxies. The morpho-kinematics properties of S0 bulges derived in this paper suggest that they are mainly formed by dissipational processes happening at high redshift, but dedicated high-resolution simulations are necessary to better identify their origin.
European Research Council Starting Grant (SEDmorph) Spanish Ministerio de Economia y Competitividad (MINECO) AYA2013-43188-P Spanish Ministry of Economy and Competitiveness (MINECO) AYA2016-77237-C3-1-P AYA2011-24728 Marie Curie Actions of the European Commission, via the Initial Training Network DAGAL under REA 289313 UK Science and Technology Facilities Council (STFC) ST/J001651/1 Padua University DOR1699945 DOR1715817 BIRD164402/16 Ministry of Economy, Development, and Tourism's Millennium Science Initiative IC120009 CONICYT through FONDECYT 3140566 Swiss National Science Foundation Spanish AEI European FEDER AYA2016-76682-C3-1P Spanish Ministry of Science ICTS-2009-10 Centro Astronomico Hispano-Aleman AYA2014-53506-P JA-FQM-108 AyA2014-57490P y JA-FQM-2828
Artículo de publicación ISI
Quote ItemMonthly Notices of The Royal Astronomical Society 474, 1307-1334 (2018)
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