Halpha3: an Halpha imaging survey of HI selected galaxies from ALFALFA.
  V: The Coma Supercluster survey completion
  Neutral hydrogen represents the major observable baryonic constituent of
galaxies that fuels the formation of stars through the transformation in
molecular hydrogen. The emission of the hydrogen recombination line Halpha is
the most direct tracer of the process that transforms gas (fuel) into stars. We
continue to present Halpha3 (acronym for Halpha-alpha-alpha), an extensive
Halpha+[NII] narrow-band imaging campaign of galaxies selected from the HI
Arecibo Legacy Fast ALFA Survey (ALFALFA), using the instrumentation available
at the San Pedro Martir observatory (Mexico). In only four years since 2011 we
were able to complete in 48 nights the Halpha imaging observations of 724
galaxies in the region of the Coma supercluster 10^h < R.A. <16^h; 24^o < Dec.
<28^o and 3900<cz<9000 kms^{-1}. Of these, 603 are selected from the HI Arecibo
Legacy Fast ALFA Survey (ALFALFA) and constitute a 97% complete sample. They
provide for the first time a complete census of the massive star formation
properties of local gas-rich galaxies belonging to different environments
(cluster vs filaments), morphological type (spirals vs dwarf Irr), over a wide
range of stellar mass (10^{8}-10^{11.5} Modot) in the Coma Supercluster. The
present Paper V provides the Halpha data and the derived star formation rates
for the observed galaxies.
