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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28431

Title: Bar pattern speed evolution over the las 7 Gyr
Authors: Pérez, Isabel
Aguerri, J. A. L.
Méndez-Abreu, J.
Issue Date: 2012
Abstract: Context. The tumbling pattern of a bar is the main parameter characterising its dynamics. From numerical simulations, its evolution since bar formation is tightly linked to the dark halo in which the bar is formed through dynamical friction and angular momentum exchange. Observational measurements of the bar pattern speed with redshift can restrict models of galaxy formation and bar evolution.
Aims. We aim to determine for the first time the bar pattern speed evolution with redshift based on morphological measurements.
Methods. We have selected a sample of 44 low-inclination ringed galaxies from the SDSS and COSMOS surveys covering the redshift range 0 < z < 0.8 to investigate the evolution of the bar pattern speed. We derived morphological ratios between the deprojected outer ring radius (Rring) and the bar size (Rbar). This quantity is related to the parameter ℛ = RCR/Rbar used for classifiying bars in slow and fast rotators, and allows us to investigate possible differences with redshift.
Results. We obtain a similar distribution of R at all redshifts. We do not find any systematic effect that could be forcing this result.
Conclusions. The results obtained here are compatible with the main bulk of the bar population (~70%) being fast-rotators and with no evolution of the pattern speed with redshift. We argue that if bars are long-lasting structures, the results presented here imply that there has not been a substantial angular momentum exchange between the bar and halo, as predicted by numerical simulations. In consequence, this might imply that the discs of these high surface-brightness galaxies are maximal.
Sponsorship: I.P. was supported by the Spanish Ministry of Science and Innovation (MICINN) (via grants AYA2010-21322-C03-02, AYA2010-21322-C03-03, AYA2007-67625-C02-02 and Consolider-Ingenio CSD2010-00064) and by the Junta de Andalucía (FQM-108). J.A.L.A. and J.M.A. were supported by the projects AYA2010-21887-C04-04 and by the Consolider-Ingenio 2010 Program grant CSD2006-00070.
Publisher: European Southern Observatory (ESO); Springer Verlag
Keywords: Galaxies
High redshift
Kinematics and dynamics
URI: http://hdl.handle.net/10481/28431
ISSN: 0004-6361
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Pérez, I.; Aguerri, J.A.L.; Méndez-Abreu, J. Bar pattern speed evolution over the las 7 Gyr. Astronomy and Astrophysics, 540: A103 (2012). [http://hdl.handle.net/10481/28431]
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