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00925njm 22002777a 4500 dc Gil De Paz, Armando author Madore, B. F. author Boissier, S. author Swaters, R. author Popescu, C. C. author Tuffs, R. J. author Sheth, K. author Kennicutt, R. C. author Bianchi, L. author Thilker, D. author Martin, D. C. author 2005-07-01 Recent far-UV (FUV) and near-UV (NUV) observations of the nearby galaxy NGC 4625 made by the Galaxy Evolution Explorer (GALEX) show the presence of an extended UV disk reaching to 4 times the optical radius of the galaxy. The UV-to-optical colors suggest that the bulk of the stars in the disk of NGC 4625 are currently being formed, providing a unique opportunity to study today the physics of star formation under conditions similar to those when the normal disks of spiral galaxies like the Milky Way first formed. In the case of NGC 4625, the star formation in the extended disk is likely to be triggered by interaction with NGC 4618 and possibly also with the newly discovered galaxy NGC 4625A. The positions of the FUV complexes in the extended disk coincide with peaks in the H I distribution. The masses of these complexes are in the range 10^3-10^4 M_☉, with their Hα emission (when present) being dominated by ionization from single stars. 0004-637X 10.1086/432054 https://hdl.handle.net/20.500.14352/51777 http://dx.doi.org/10.1086/432054 http://iopscience.iop.org/ Discovery of an extended ultraviolet disk in the nearby galaxy NGC 4625