S19A0109abst
S19A0109
We have carried out very deep Suprime-Cam Hα survey for the Coma cluster using a custom-made narrow-band (NB) filter, which samples the Hα line at the distance of Coma, to trace star forming activities down to unprecedentedly faint levels (2×10−4 M⊙/yr), reaching 2 orders of magnitude deeper than previous Hα surveys. The survey clearly showed that the substantial number of faint galaxies exhibiting star formations (i.e. those with NB excess flux) do exist in the almost quenched cluster in the local universe. However, it is necessary to reject the background contaminations from the NB-excess objects in order to construct the accurate Hα luminosity function. We have found that statistical background subtruction does not work. Therefore, we propose to conduct a multi-object spectroscopy for our NB excess objects using Keck DEIMOS to obtain their redshifts. The resultant accurate Coma Hα luminosity function will answer the long awaited question how significant the faint galaxies contribute to the star formation activity in the local dense environment and would bring a new macroscopic view of the local star formation activity. This proposal is a re-submission of S14A-090 which was awarded 1 night in 2014 Spring but the observing time was completely lost due to the snow fall at Maunakea.
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