Ionized gas kinematics of galaxies in the CALIFA survey

Abstract

Context. Ionized gas kinematics provide important clues to the dynamical structure of galaxies and hold constraints to the processes driving their evolution. Aims. The motivation of this work is to provide an overall characterization of the kinematic behavior of the ionized gas of the galaxies included in the Calar Alto Legacy Integral field Area (CALIFA), offering kinematic clues to potential users of the CALIFA survey for including kinematical criteria in their selection of targets for specific studies. From the first 200 galaxies observed by CALIFA survey in its two configurations, we present the two-dimensional kinematic view of the 177 galaxies satisfaying a gas content/detection threshold. Methods. After removing the stellar contribution, we used the cross-correlation technique to obtain the radial velocity of the dominant gaseous Results. At the velocity resolution of CALIFA, most objects in the sample show regular velocity fields, although the ionized-gas kinematics are rarely consistent with simple coplanar circular motions. Thirty-five percent of the objects present evidence of a displacement between the photometric and kinematic centers larger than the original spaxel radii. Only 17% of the objects in the sample exhibit kinematic lopsidedness when comparing receding and approaching sides of the velocity fields, but most of them are interacting galaxies exhibiting nuclear activity (AGN or LINER). Early-type (E+S0) galaxies in the sample present clear photometric-kinematic misaligments. There is evidence of asymmetries in the emission line profiles in 117 out of the 177 analyzed galaxies, suggesting the presence of kinematically distinct gaseous components located at different distances from the optical nucleus. The kinematic decoupling between the dominant and secondary component/s suggested by the observed asymmetries in the profiles can be characterized by a limited set of parameters. Conclusions. This work constitutes the first determination of the ionized gas kinematics of the galaxies observed in the CALIFA survey. The derived velocity fields, the reported kinematic distortions/peculiarities and the identification of the presence of several gaseous components in different regions of the objects might be used as additional criteria for selecting galaxies for specific studies.

One Law to Rule Them All: The Radial Acceleration Relation of Galaxies

“…IFU surveys like CALIFA (García-Lorenzo et al 2015) and MANGA (Bundy et al 2015) are providing large galaxy samples with spatially resolved kinematics, but they usually lack H I data. The availability of both gas and stellar maps is one of the key advantages of SPARC.…”

Bar pattern speeds in CALIFA galaxies

“…In contrast to stars, the gas is almost in circular orbits in galaxy discs. We have the gas velocity curve along the major axis for a total of 11 of our galaxies (see details in García-Lorenzo et al (2015). Figure 10 shows the comparison between V c,flat obtained from gas and stellar kinematics.…”

Incorrect rotation curve of the Milky Way

“…4 in Kawata et al 2014). It appears essential here that the inner Galactic velocity field has to be covered as uniformly as possible in radius and azimuthal angle to obtain the most accurate inner rotation curve, similarly as is routinely done for nearby galaxies with 3D spectroscopy or radio interferometry (Emsellem et al 2004;Chemin et al 2006;de Blok et al 2008;García-Lorenzo et al 2015). This would require observations of other tracers than masers in more diffuse regions outside the bar and the arms.…”