Fermi-LAT and Multi-wavelength Monitoring of the Broad Line Radio Galaxy 3C 120
Y. T. Tanaka, A. Doi, Y. Inoue, C. C. Cheung, L. Stawarz, Y. Fukazawa,, M. A. Gurwell, M. Tahara, J. Kataoka, and R. Itoh (on behalf of the Fermi-LAT, collaboration)
TL;DR
This six-year multi-wavelength study of 3C 120 reveals the connection between gamma-ray and radio emissions, pinpointing the gamma-ray origin near the black hole and identifying inverse-Compton scattering as the emission mechanism.
Contribution
The paper provides the first detailed localization of gamma-ray emission in 3C 120 and links gamma-ray activity with radio jet ejections, advancing understanding of emission regions in broad-line radio galaxies.
Findings
Gamma-ray emission region is within sub-parsec from the black hole.
Gamma-ray emission mechanism is inverse-Compton scattering of synchrotron photons.
Radio core brightening correlates with gamma-ray detection and jet ejection events.
Abstract
We present six-year multi-wavelength monitoring result for broad-line radio galaxy 3C 120. The source was sporadically detected by Fermi-LAT and after the MeV/GeV gamma-ray detection the 43 GHz radio core brightened and a knot ejected from an unresolved core, implying that the radio-gamma phenomena are physically connected. We show that the gamma-ray emission region is located at sub-pc distance from the central black hole, and MeV/GeV gamma-ray emission mechanism is inverse-Compton scattering of synchrotron photons. We also discuss future perspective revealed by next-generation X-ray satellite Astro-H.
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Taxonomy
TopicsRadio Astronomy Observations and Technology · Astronomical Observations and Instrumentation · Astronomy and Astrophysical Research