H alpha kinematics of S4G spiral galaxies - II. Data description and non-circular motions

We present a kinematical study of 29 spiral galaxies included in the Spitzer Survey of Stellar Structure in Galaxies, using Ha Fabry Perot (FP) data obtained with the Galaxy Ha Fabry Perot System instrument at the William Herschel Telescope in La Palma, complemented with images in the R band and in Ha. The primary goal is to study the evolution and properties of the main structural components of galaxies through the kinematical analysis of the FP data, complemented with studies of morphology, star formation and mass distribution. In this paper we describe how the FP data have been obtained, processed and analysed. We present the resulting moment maps, rotation curves, velocity model maps and residual maps. Images are available in Errs format through the NASA/IPAC Extragalactic Database and the Centre de Donnees Stellaires. With these data products we study the non-circular motions, in particular those found along the bars and spiral arms. The data indicate that the amplitude of the non-circular motions created by the bar does not correlate with the bar strength indicators. The amplitude of those non-circular motions in the spiral arms does not correlate with either arm class or star formation rate along the spiral arms. This implies that the presence and the magnitude of the streaming motions in the arms is a local phenomenon.People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7 under REA [PITN-GA-2011-289313]; Spanish MINECO [AYA2013-41243-P]; Marie Curie Actions of the European Commission (FP7-COFUND); NASA JPL/Spitzer grant [RSA 1374189]; CNES; National Radio Astronomy Observatory, National Science Foundation; MINECO [AYA2007-67625-CO2-O2]SCI(E)ARTICLEserroz@iac.es; jhk@iac.es11004-102445