The CALIFA view on stellar angular momentum across the Hubble sequence

We present the apparent stellar angular momentum over the optical extent of 300 galaxies across the Hubble sequence using integral-field spectroscopic (IFS) data from the CALIFA survey. Adopting the same λR parameter previously used to distinguish between slow and fast rotating early-type (elliptica...

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Detalles Bibliográficos
Autores: Falcón Barroso, J., Van De Ven, G., Lyubenova, M., Mendez Abreu, J., Aguerri, J.A.L., García Lorenzo, B., Bekeraité, S., Sánchez, S.F., Husemann, B., García Benito, R., González Delgado, R.M., Mast, Damian, Walcher, C.J., Zibetti, S., Zhu, L., Barrera Ballesteros, J.K., Galbany, L., Sánchez Blázquez, P., Singh, R., Van Den Bosch, R.C.E., Wild, V., Bland Hawthorn, J., Cid Fernandes, R., De Lorenzo Cáceres, A., Gallazzi, A., Marino, Ricardo Alberto, Márquez, I., Peletier, R.F., Pérez, E., Pérez, I., Roth, M.M., Rosales Ortega, F.F., Ruiz Lara, T., Wisotzki, L., Ziegler, B.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/129253
Acceso en línea:http://hdl.handle.net/11336/129253
Access Level:acceso abierto
Palabra clave:CD
ELLIPTICAL AND LENTICULAR
GALAXIES
GALAXIES: EVOLUTION
GALAXIES: FORMATION
GALAXIES: SPIRAL
GALAXIES: STRUCTURE
KINEMATICS AND DYNAMICS
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descripción
Sumario:We present the apparent stellar angular momentum over the optical extent of 300 galaxies across the Hubble sequence using integral-field spectroscopic (IFS) data from the CALIFA survey. Adopting the same λR parameter previously used to distinguish between slow and fast rotating early-type (elliptical and lenticular) galaxies, we show that spiral galaxies are almost all fast rotators, as expected. Given the extent of our data, we provide relations for λR measured in different apertures (e.g. fractions of the effective radius: 0.5 Re, Re, 2 Re), including conversions to long-slit 1D apertures. Our sample displays a wide range of λRe values, consistent with previous IFS studies. The fastest rotators are dominated by relatively massive and highly star-forming Sb galaxies, which preferentially reside in the main star-forming sequence. These galaxies reach λRe values of ∼0.85, and they are the largest galaxies at a given mass, while also displaying some of the strongest stellar population gradients. Compared to the population of S0 galaxies, our findings suggest that fading may not be the dominant mechanism transforming spirals into lenticulars. Interestingly, we find that λRe decreases for late-type Sc and Sd spiral galaxies, with values that occasionally set them in the slow-rotator regime. While for some of them this can be explained by their irregular morphologies and/or face-on configurations, others are edge-on systems with no signs of significant dust obscuration. The latter are typically at the low-mass end, but this does not explain their location in the classical (V/σ, ε) and (λRe, ε) diagrams. Our initial investigations, based on dynamical models, suggest that these are dynamically hot disks, probably influenced by the observed important fraction of dark matter within Re.

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