2026-06-27T15:20:31Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/240082024-09-10T16:04:46Zcom_20.500.14352_14col_20.500.14352_15

Koda, Jin Yagi, Masafumi Komiyama, Yutaka Boissier, Samuel Boselli, Alessandro Bouquin, Alexandre Y. K. Meyer, Jennifer Donovan Gil De Paz, Armando Imanishi, Masatoshi Madore, Barry F. Thilker, David A. 2023-06-18T06:44:49Z 2023-06-18T06:44:49Z 2015-04-01 2041-8205 10.1088/2041-8205/802/2/L24 https://hdl.handle.net/20.500.14352/24008 http://dx.doi.org/10.1088/2041-8205/802/2/L24 http://iopscience.iop.org/ 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. eng open access Discovery of new dwarf galaxy near the isolated spiral galaxy NGC 6503 journal article