Small-Scale Dynamical Coherence Accompanied with Galaxy Conformity
  The discovery of the coherence between galaxy rotation and neighbor motion in
1-Mpc scales has been reported recently. Following up the discovery, we
investigate whether the neighbors in such dynamical coherence also present
galaxy conformity, using the Calar Alto Legacy Integral Field Area Survey
(CALIFA) data and the NASA-Sloan Atlas (NSA) catalog. We measure the
correlation coefficient of g - r colors between the CALIFA galaxies and their
neighbors, as a quantitative indicator of galaxy conformity. The neighbors are
divided into coherently moving and anti-coherently moving ones, the correlation
coefficients from which are compared with each other, in various bins of
relative luminosity and projected distance. In most cases, the CALIFA galaxies
and their neighbors show positive correlation coefficients in g - r color, even
for the anti-coherent neighbors. However, we find statistically significant
(2.6-sigma) difference between coherent and anti-coherent neighbors, when the
neighbor galaxies are bright (Delta Mr <= -1.0) and close (D <= 400 kpc). That
is, when they are bright and close to the CALIFA galaxies, the coherently
moving neighbors show stronger conformity with the CALIFA galaxies than the
anti-coherently moving neighbors. This result supports that the small-scale
dynamical coherence may originate from galaxy interactions as galaxy conformity
is supposed to do, which agrees with the conclusion of the previous study.
