A Study of Environmental Effects on Galaxy Spin Using MaNGA Data
  We investigate environmental effects on galaxy spin using the recent public
data of MaNGA integral field spectroscopic survey containing ~2800 galaxies. We
measure the spin parameter of 1830 galaxies through the analysis of
two-dimensional stellar kinematic maps within the effective radii, and obtain
their large- (background mass density from 20 nearby galaxies) and small-scale
(distance to and morphology of the nearest neighbour galaxy) environmental
parameters for 1529 and 1767 galaxies, respectively. We first examine the mass
dependence of galaxy spin, and find that the spin parameter of early-type
galaxies decreases with stellar mass at log (M$_*/$M$_{\odot}$) $\gtrsim$ 10,
consistent with the results from previous studies. We then divide the galaxies
into three subsamples using their stellar masses to minimize the mass effects
on galaxy spin. The spin parameters of galaxies in each subsample do not change
with background mass density, but do change with distance to and morphology of
the nearest neighbour. In particular, the spin parameter of late-type galaxies
decreases as early-type neighbours approach within the virial radius. These
results suggest that the large-scale environments hardly affect the galaxy
spin, but the small-scale environments such as hydrodynamic galaxy-galaxy
interactions can play a substantial role in determining galaxy spin.
