2010/06/30 by Liang Chen, J. M. Bai, Jin-Ming Bai +3
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #astro-ph.HE
paper · pdf · doi:10.1088/1674-4527/10/8/001
published as 2010RAA....10..707C · 7 pages, 4 figures, matches version published in Research in Astronomy and Astrophysics (RAA)
openalex publication_date 2010/07/26 · arxiv created 2010/09/08 · arxiv updated 2010/09/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
AGNs with hard γ-ray emission identified so far are radio-loud. III Zw 2 is a radio intermediate AGN with a relativistic jet. We study its spectral energy distribution (SED) and find that the broad band emissions are dominated by the non-thermal emissions from the jet. We model its SED through a synchrotron + inverse Compton (IC) model. The results show that the IC component of III Zw 2 peaks at a few MeV, and the flux density drops rapidly at higher energy with photon index Γ ≈ 3.3 above 0.1 GeV. The predicted flux is slightly over the sensitivity of Fermi /LAT, but it was not included in the first Fermi /LAT AGN catalog. The reason for this may be: 1) that the IC peak is low and the spectrum is very steep above 0.1 GeV, 2) that III Zw 2 is in the low state during the period of the Fermi /LAT operation. We also find that III Zw 2 follows similar jet processes as those in γ-ray AGNs, e.g., the relation between jet power and radiation power, which is called the blazar sequence. We suggest that III Zw 2 may be a young source at an earlier stage of jet activity.