Searching for further evidence for cloud-cloud collisions in L1188
  In order to search for further observational evidence of cloud-cloud
collisions in one of the promising candidates, L1188, we carried out
observations of multiple molecular lines toward the intersection region of the
two nearly orthogonal filamentary molecular clouds in L1188. Based on these
observations, we find two parallel filamentary structures, both of which have
at least two velocity components being connected with broad bridging features.
We also found a spatially complementary distribution between the two molecular
clouds, as well as enhanced $^{13}$CO emission and $^{12}$CO self-absorption
toward their abutting regions. At the most blueshifted velocities, we unveil a
1~pc-long arc ubiquitously showing $^{12}$CO line wings. We discover two 22 GHz
water masers, which are the first maser detections in L1188. An analysis of
line ratios at a linear resolution of 0.2 pc suggests that L1188 is
characterised by kinetic temperatures of 13--23~K and H$_{2}$ number densities
of 10$^{3}$--10$^{3.6}$ cm$^{-3}$. On the basis of previous theoretical
predictions and simulations, we suggest that these observational features can
be naturally explained by the scenario of a cloud-cloud collision in L1188,
although an additional contribution of stellar feedback from low-mass young
stellar objects cannot be ruled out.
