Renewed Radio Activity of Age 370 years in the Extragalactic Source 0108+388
Abstract
We present the results of multi-epoch global VLBI observations of the Compact Symmetric Object (CSO) 0108+388 at 5 GHz. Analysis of data spread over 12 years shows strong evidence for an increase in the separation of the outer components at a rate of 0.1970.026 h-1c. Given an overall size of 22.2 h-1pc this implies a kinematic age of only 36748 yrs. This result strongly supports the idea that radio emission in Compact Symmetric Objects arises from recently activated radio sources. The presence of weak radio emission on kpc-scales in 0108+388 suggests recurrent activity in this source, and that we are observing it just as a new period of activity is beginning.
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