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Journal Article

Structural and photometric properties of barred galaxies from the Auriga cosmological simulations


Grand,  Robert J. J.
Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society;


Fragkoudi,  Francesca
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;


Pakmor,  Rüdiger
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Blázquez-Calero, G., Florido, E., Pérez, I., Zurita, A., Grand, R. J. J., Fragkoudi, F., et al. (2019). Structural and photometric properties of barred galaxies from the Auriga cosmological simulations. Monthly Notices of the Royal Astronomical Society, 491(2), 1800-1819. doi:10.1093/mnras/stz3125.

Cite as: https://hdl.handle.net/21.11116/0000-0005-C458-B
In this work we analyse the structural and photometric properties of 21 barred simulated galaxies from the Auriga Project. These consist of Milky Way-mass magnetohydrodynamical simulations in a Λ cold dark matter (ΛCDM) cosmological context. In order to compare with observations, we generate synthetic SDSS-like broad-band images from the numerical data at z = 0 with different inclinations (from face-on to edge-on). Ellipse fits are used to determine the bar lengths, and 2D bulge/disc/bar decompositions with galfit are also performed, modelling the bar component with the modified Ferrer profile. We find a wide range of bar sizes and luminosities in the sample, and their structural parameters are in good agreement with the observations. All bulges present low Sérsic indexes, and are classified as pseudobulges. In regard to the discs, the same breaks in the surface brightness profiles observed in real galaxies are found, and the radii at which these take place are in agreement with the observations. Also, from edge-on unsharp-masked images at z = 0, boxy or peanut-shaped (B/P) structures are clearly identified in the inner part of four bars, and also two more bars are found in buckling phase. The sizes of the B/P match fairly well with those obtained from observations. We thus conclude that the observed photometric and structural properties of galaxies with bars, which are the main drivers of secular evolution, can be developed in present state-of-the-art ΛCDM cosmological simulations.