Narrowband H$\alpha$ imaging of nearby Wolf-Rayet galaxies
  We present narrowband H$\alpha$ imaging of nearby Wolf-Rayet (WR) galaxies
known as a subset of starburst galaxies. The H$\alpha$ images have been used to
show morphology of star-forming regions in galaxies, which leads to speculate
that the studied galaxies have most likely experienced merger or interaction
with low luminous dwarf galaxies or \HI clouds. We further derive the H$\alpha$
based star formation rates (SFRs) in galaxies using our H$\alpha$ observations.
These SFRs are well-correlated with SFRs derived using other indicators at
far-ultraviolet, far-infrared and 1.4-GHz radio wavebands. It is noticed that
the infrared excess (IRX) method gives the best SFR estimates, consistent with
different models predication. These models also predict that the sample
galaxies have probably gone through a continuous star formation at least for 1
Gyr over which the recent (< 10 Myr) star formation has taken place in WR
phase. This study presents Main-Sequence (MS) relation for nearby WR galaxies
for the first time. This derived MS relation is found to be similar to
previously known MS relation for normal nearby star-forming galaxies,
suggesting that WR systems evolve in a similar fashion as normal star-forming
galaxies evolve.
