Highly variable gamma-ray emission of CTD 135 and implications for its compact symmetric structure

The gamma-ray emission properties of CTD 135, a typical compact symmetric object (CSO), are investigated with similar to 11-year Fermi/LAT observations. We show that it has bright and significantly variable GeV emission, with the gamma-ray luminosity of L-gamma similar to 10(47) erg s(-1) and a variation index of TSvar = 1002. A quasi-periodic oscillation (QPO) with a periodicity of similar to 460 days is detected in the global 95% false-alarm level. These gamma-ray emission features are similar to that of blazars. Its broadband spectral energy distribution (SED) can be attributed to the radiations of the relativistic electrons accelerated in the core region and the extended region. The SED modeling shows that the gamma-rays are from the core region, which has a Doppler boosting factor of delta similar to 10.8 and relativistically moves with a small viewing angle, being similar to blazar jets. On the base of the analysis results, we propose that the episodic activity of the central engine in CTD 135 results in a blazar-like jet and the bubble-like lobes as the Fermi bubbles in the Galaxy. The strong gamma-ray emission with obvious variability is from the jet radiations and the symmetric radio structure is attributed to the bubbles. The jet radiation power and disk luminosity in units of Eddington luminosity of CTD 135 follow the same relation as other young radio sources, indicating that its jet radiation may also be driven by the Eddington ratio.