H-alpha imaging of the Local Volume galaxies I. The NGC 6946 galaxy group
Abstract
We present new H-alpha imaging of all known dwarf irregular companions to NGC 6946: UGC 11583, KK 251, KK 252, KKR 55, KKR 56, Cepheus 1, KKR 59, and KKR 60. The galaxies span a range of blue absolute magnitudes of [-13.6, -17.6], relative gas content of [0.1, 2.5] Msun/Lsun, current star formation activity of [0.2, 5.2]10-2 Msun yr-1, and timescale to exhaust the current gas supply of [6, 86] Gyr.
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