%0 Journal Article
%A Koda, Jin
%A Yagi, Masafumi
%A Komiyama, Yutaka
%A Boissier, Samuel
%A Boselli, Alessandro
%A Bouquin, Alexandre Y. K.
%A Meyer, Jennifer Donovan
%A Gil De Paz, Armando
%A Imanishi, Masatoshi
%A Madore, Barry F.
%A Thilker, David A.
%T Discovery of new dwarf galaxy near the isolated spiral galaxy NGC 6503
%D 2015
%@ 2041-8205
%U https://hdl.handle.net/20.500.14352/24008
%X We report the discovery of a new dwarf galaxy (NGC 6503-d1) during the Subaru extended ultraviolet disk survey. It is a likely companion of the spiral galaxy NGC 6503. The resolved images, in the B, V, R, i, and H alpha bands, show an irregular appearance due to bright stars with underlying, smooth and unresolved stellar emission. It is classified as the transition type (dwarf irregular (dIrr)/dwarf spheroidal (dSph)) between the dIrr and dSph types. Its structural properties are similar to those of the dwarfs in the Local Group, with an absolute magnitude M-V similar to -10.5, half-light radius r(e) similar to 400 pc, and central surface brightness mu(0,V) similar to 25.2. Despite the low stellar surface brightness environment, one H II region was detected, though its H alpha luminosity is low, indicating an absence of any appreciable O-stars at the current epoch. The presence of multiple stellar populations is indicated by the color-magnitude diagram of similar to 300 bright resolved stars and the total colors of the dwarf, with the majority of its total stellar mass similar to 4 x 10(6) M-circle dot in an old stellar population.
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