Artículo de revista
Integral-Field Stellar and Ionized Gas Kinematics of Peculiar Virgo Cluster Spiral Galaxies
Fecha
2015Registro en:
The Astrophysical Journal Supplement Series, 216:9 (34pp), 2015 January
0067-0049
DOI: 10.1088/0067-0049/216/1/9
Autor
Cortés López, Juan
Kenney, Jeffrey
Hardy Raskovan, Eduardo
Institución
Resumen
We present the stellar and ionized gas kinematics of 13 bright peculiar Virgo cluster galaxies observed with the
DensePak Integral Field Unit at the WIYN 3.5m telescope in order to look for kinematic evidence that these
galaxies have experienced gravitational interactions or gas stripping. Two-dimensional maps of the stellar velocity
V, stellar velocity dispersion σ, and the ionized gas velocity (Hβ and/or [O iii]) are presented for the galaxies in the
sample. The stellar rotation curves and velocity dispersion profiles are determined for 13 galaxies, and the ionized
gas rotation curves are determined for 6 galaxies. Misalignments between the optical and kinematical major axes
are found in several galaxies. While in some cases this is due to a bar, in other cases it seems to be associated with
gravitational interaction or ongoing ram pressure stripping. Non-circular gas motions are found in nine galaxies,
with various causes including bars, nuclear outflows, or gravitational disturbances. Several galaxies have signatures
of kinematically distinct stellar components, which are likely signatures of accretion or mergers. For all of our
galaxies, we compute the angular momentum parameter λR. An evaluation of the galaxies in the λR ellipticity
plane shows that all but two of the galaxies have significant support from random stellar motions, and have likely
experienced gravitational interactions. This includes some galaxies with very small bulges and truncated/compact
Hα morphologies, indicating that such galaxies cannot be fully explained by simple ram pressure stripping, butmust
have had significant gravitational encounters. Most of the sample galaxies show evidence for ICM-ISM stripping as
well as gravitational interactions, indicating that the evolution of a significant fraction of cluster galaxies is likely
strongly impacted by both effects
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