... 1958), in the case of hydrogen excitation (ionization) by ultraviolet radiation from young massive stars (H II region-type ... the galaxy's images in various spectral bands, from the ultraviolet to near-infrared ones, with a high spatial resolution ...
... Among the other interesting features of NGC 5055 we must mention its ultraviolet nucleus. ... But in NGC 5055 the ultraviolet nucleus mapped by HST/FOC with high spatial resolution has appeared to be resolved: its ...
... the public UV imaging data obtained by the GALEX (Galaxy Ultraviolet Explorer) for nearby galaxies, we have compiled a list of lenticular galaxies possessing ultraviolet rings -- starforming regions tightly confined to particular radial distances from ...
... For example, the large scatter in the ultraviolet colours of early-type galaxies in the nearby Universe which has been found by GALEX recently can be explained by low-level star formation in their centers as a result of minor merging, or accretion, of gas ...
... Ultraviolet imaging with the UIT and later on with the GALEX has revealed an extended, up to R = 40 , star-forming disk in NGC 2551 (Marcum et al. ...
... The smallest H/H emission ratio, 2.52.7 (Burgess 1958), is obtained in the case of hydrogen excitation (ionization) by ultraviolet radiation from young massive stars (H II-region-type excitation). ...