Bar pattern speeds in CALIFA galaxies : I. Fast bars across the Hubble sequence
MetadataShow full item record
Context. The bar pattern speed (Ωb) is defined as the rotational frequency of the bar, and it determines the bar dynamics. Several methods have been proposed for measuring Ωb. The non-parametric method proposed by Tremaine & Weinberg (1984, ApJ, 282, L5; TW) and based on stellar kinematics is the most accurate. This method has been applied so far to 17 galaxies, most of them SB0 and SBa types. Aims. We have applied the TW method to a new sample of 15 strong and bright barred galaxies, spanning a wide range of morphological types from SB0 to SBbc. Combining our analysis with previous studies, we investigate 32 barred galaxies with their pattern speed measured by the TW method. The resulting total sample of barred galaxies allows us to study the dependence of Ωb on galaxy properties, such as the Hubble type. Methods. We measured Ωb using the TW method on the stellar velocity maps provided by the integral-field spectroscopy data from the CALIFA survey. Integral-field data solve the problems that long-slit data present when applying the TW method, resulting in the determination of more accurate Ωb. In addition, we have also derived the ratio ℜ of the corotation radius to the bar length of the galaxies. According to this parameter, bars can be classified as fast (ℜ <1.4) and slow (ℜ > 1.4). Results. For all the galaxies, ℜ is compatible within the errors with fast bars. We cannot rule out (at 95% level) the fast bar solution for any galaxy. We have not observed any significant trend between ℜ and the galaxy morphological type. Conclusions. Our results indicate that independent of the Hubble type, bars have been formed and then evolve as fast rotators. This observational result will constrain the scenarios of formation and evolution of bars proposed by numerical simulations.
Aguerri , J A L , Mendez Abreu , J , Falcón-Barroso , J , Amorin , A , Barrera-Ballesteros , J , Cid Fernandes , R , García-Benito , R , García-Lorenzo , B , González Delgado , R M , Husemann , B , Kalinova , V , Lyubenova , M , Marino , R A , Márquez , I , Mast , D , Pérez , E , Sánchez , S F , Van De Ven , G , Walcher , C J , Backsmann , N , Cortijo-Ferrero , C , Bland-Hawthorn , J , Del Olmo , A , Iglesias-Páramo , J , Pérez , I , Sánchez-Blázquez , P , Wisotzki , L & Ziegler , B 2015 , ' Bar pattern speeds in CALIFA galaxies : I. Fast bars across the Hubble sequence ' Astronomy & Astrophysics , vol 576 , A102 . DOI: 10.1051/0004-6361/201423383
Astronomy & Astrophysics
Copyright ESO 2015. Reproduced with permission from Astronomy & Astrophysics, © ESO. The final published version of this work is also available from the publisher: http://dx.doi.org/10.1051/0004-6361/201423383
J.M.A. acknowledges support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild). Date of Acceptance: 07/01/2015
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Showing items related by title, author, creator and subject.
Mendez Abreu, Jairo; Debattista, V. P.; Corsini, E. M.; Aguerri, J. A. L. (2014-12) - Journal articleContext. Historically, galaxy bulges were thought to be single-component objects at the center of galaxies. However, this picture is now questioned since different bulge types with different formation paths, namely classical ...
Galaxy And Mass Assembly (GAMA) : mass-size relations of z < 0.1 galaxies subdivided by Sérsic index, colour and morphology Lange, Rebecca; Driver, Simon P.; Robotham, Aaron S. G.; Kelvin, Lee S.; Graham, Alister W.; Alpaslan, Mehmet; Andrews, Stephen K.; Baldry, Ivan K.; Bamford, Steven; Bland-Hawthorn, Joss; Brough, Sarah; Cluver, Michelle E.; Conselice, Christopher J.; Davies, Luke J. M.; Haeussler, Boris; Konstantopoulos, Iraklis S.; Loveday, Jon; Moffett, Amanda J.; Norberg, Peder; Phillipps, Steven; Taylor, Edward N.; Lopez-Sanchez, Angel R.; Wilkins, Stephen M. (2015-03-01) - Journal articleWe use data from the Galaxy And Mass Assembly (GAMA) survey in the redshift range 0.01 < z < 0.1 (8399 galaxies in g to Ks bands) to derive the stellar mass–half-light radius relations for various divisions of ‘early’- and ...
Galaxy And Mass Assembly (GAMA) : the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph Vulcani, Benedetta; Bamford, Steven P.; Haeussler, Boris; Vika, Marina; Rojas, Alex; Agius, Nicola K.; Baldry, Ivan; Bauer, Amanda E.; Brown, Michael J. I.; Driver, Simon; Graham, Alister W.; Kelvin, Lee S.; Liske, Jochen; Loveday, Jon; Popescu, Cristina C.; Robotham, Aaron S. G.; Tuffs, Richard J. (2014-06) - Journal articleWe investigate the relationship between colour and structure within galaxies using a large, volume-limited sample of bright, low-redshift galaxies with optical-near-infrared imaging from the Galaxy And Mass Assembly survey. ...