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We explore the age distribution of the globular cluster (GC) system of thenearby elliptical galaxy NGC 5128 using ultraviolet (UV) photometry from GalaxyEvolution Explorer (GALEX) observations, with UV - optical colors used as theage indicator. Most GCs in NGC 5128 follow the general trends of GCs in M31 andMilky Way in UV - optical color-color diagram, which indicates that themajority of GCs in NGC 5128 are old similar to the age range of old GCs in M31and Milky Way. A large fraction of spectroscopically identifiedintermediate-age GC (IAGC) candidates with ~ 3-8 Gyr are not detected in theFUV passband. Considering the nature of intermediate-age populations beingfaint in the far-UV (FUV) passband, we suggest that many of thespectroscopically identified IAGCs may be truly intermediate in age. This is incontrast to the case of M31 where a large fraction of spectroscopicallysuggested IAGCs are detected in FUV and therefore may not be genuine IAGCs butrather older GCs with developed blue horizontal branch stars. Our UV photometrystrengthens the results previously suggesting the presence of GC and stellarsubpopulation with intermediate age in NGC 5128. The existence of IAGCsstrongly indicates the occurrence of at least one more major star formationepisode after a starburst at high redshift.

Probing the Intermediate-Age Globular Clusters in NGC 5128 from Ultraviolet Observations