Bibcode
García-Lorenzo, B.; Márquez, I.; Barrera-Ballesteros, J. K.; Masegosa, J.; Husemann, B.; Falcón-Barroso, J.; Lyubenova, M.; Sánchez, S. F.; Walcher, J.; Mast, D.; García-Benito, R.; Méndez-Abreu, J.; van de Ven, G.; Spekkens, K.; Holmes, L.; Monreal-Ibero, A.; del Olmo, A.; Ziegler, B.; Bland-Hawthorn, J.; Sánchez-Blázquez, P.; Iglesias-Páramo, J.; Aguerri, J. A. L.; Papaderos, P.; Gomes, J. M.; Marino, R. A.; González Delgado, R. M.; Cortijo-Ferrero, C.; López-Sánchez, A. R.; Bekeraitė, S.; Wisotzki, L.; Bomans, D.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 573, id.A59, 43 pp.
Fecha de publicación:
1
2015
Revista
Número de citas
54
Número de citas referidas
49
Descripción
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 component for each spectrum in the CALIFA data
cubes for different emission lines (namely, [O ii]
λλ3726,3729, [O iii] λλ4959,5007,
Hα+[N ii] λλ6548,6584, and
[SII]λλ6716,6730). The main kinematic parameters measured
on the plane of the sky were directly derived from the radial velocities
with no assumptions on the internal prevailing motions. Evidence of the
presence of several gaseous components with different kinematics were
detected by using [O iii] λλ4959,5007 emission line
profiles. 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.
Based on observations collected at the Centro Astronmico Hispano Alemn
(CAHA) at Calar Alto, operated jointly by the Max-Planck Institut
für Astronomie and the Instituto de Astrofísica de
Andalucía (CSIC).Appendices are available in electronic form at
http://www.aanda.org
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