Morpho-kinematic properties of field S0 bulges in the CALIFA survey
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AuthorMéndez-Abreu, J.; Ruiz Lara, Tomás; Sánchez Menguiano, Laura; Lorenzo-Cáceres, A. de; Florido Navio, Estrella; González Delgado, Rosa María; Márquez Pérez, Isabel; Califa Collaboration
Oxford University Press (OUP)
GalaxiesBulgesEvolutionFormationKinematics and dynamicsPhotometryStructure
Califa Collaboration. Morpho-kinematic properties of field S0 bulges in the CALIFA survey. Monthly Notices of the Royal Astronomical Society, 474(1): 1307-1334 (2018). [http://hdl.handle.net/10481/49781]
SponsorshipJM-A and VW acknowledge support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild). JM-A and JALA acknowledge support from the Spanish Ministerio de Economia y Competitividad (MINECO) by the grant AYA2013-43188-P and JF-B by grant AYA2016-77237-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO). JF-B and GvdV acknowledge financial support from the FP7 Marie Curie Actions of the European Commission, via the Initial Training Network DAGAL under REA grant agreement number 289313. TR-L and EF acknowledge the support from the projects AYA2014-53506-P and JA-FQM-108. AdL-C acknowledges support from the UK Science and Technology Facilities Council (STFC) grant ST/J001651/1 and from the Spanish Ministry of Economy and Competitiveness (MINECO) grant AYA2011-24728. EMC and LC acknowledge financial support from Padua University through grants DOR1699945, DOR1715817 and BIRD164402/16. RMGD and RG-B acknowledge the support from the project AyA2014-57490-P y JA-FQM-2828. Support for LG is provided by the Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009 awarded to The Millennium Institute of Astrophysics (MAS), and CONICYT through FONDECYT grant 3140566. RAM acknowledges support by the Swiss National Science Foundation. IM acknowledges financial support from the Spanish AEI and European FEDER fundings through the research project AYA2016-76682-C3-1P. This paper is based on data from the Calar Alto Legacy Integral Field Area Survey, CALIFA (http://califa.caha.es), funded by the Spanish Ministry of Science under grant ICTS-2009-10, and the Centro Astronómico Hispano-Alemán.
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⊙ > 1010). 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 (λ and v/σ). 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 λ and v/σ. We find that the photometric (n and B/T) and kinematic (v/σ and λ) 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.