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We have carried out a Chandra X-ray and multi-frequency radio VLBA study ofthe AGN TXS 0128+554, which is associated with the Fermi gamma-ray source 4FGLJ0131.2+5547. The AGN is unresolved in a target 19.3 ks Chandra image, and itsspectrum is well fit by a simple absorbed power law model, with nodistinguishable spectral features. Its relatively soft X-ray spectrum comparedto other CSOs may be indicative of a thermal emission component, for which wewere able to obtain an upper temperature limit of kT = 0.08 keV. The compactradio morphology and measured advance speed of 0.32c +- 0.07c indicate akinematic age of only 82 y +- 17 y, placing TXS 0128+554 among the youngestmembers of the compact symmetric object (CSO) class. The lack of compact,inverted spectrum hotspots and an emission gap between the bright inner jet andouter radio lobe structure indicate that the jets have undergone episodicactivity, and were re-launched a decade ago. The predicted gamma-ray emissionfrom the lobes, based on an inverse Compton-emitting cocoon model, is threeorders of magnitude below the observed Fermi LAT flux. A comparison to otherFermi-detected and non-Fermi detected CSOs with redshift z<0.1 indicates thatthe gamma-ray emission likely originates in the inner jet/core region, and thatnearby, recently launched AGN jets are primary candidates for detection by theFermi LAT instrument.

TXS 0128+554: A Young Gamma-Ray Emitting AGN With Episodic Jet Activity