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Fermi Large Area Telescope Observations of the Active Galaxy 4C +55.17: Steady, Hard Gamma-Ray Emission and its Implications by McConville, W.; Ostorero, L.; Moderski, R.; Stawarz, Ł.; Cheung, C. C.; Ajello, M.; Bouvier, A.; Bregeon, J.; Donato, D.; Finke, J.; Furniss, A.; McEnery, J. E.; Monzani, M. E.; Orienti, M.; Reyes, L. C.; Rossetti, A.; Williams, D. A. is a scholarly article available to read on EtoBox.

What is Fermi Large Area Telescope Observations of the Active Galaxy 4C +55.17: Steady, Hard Gamma-Ray Emission and its Implications about?

We report Fermi/LAT observations and broad-band spectral modeling of the radio-loud active galaxy 4C +55.17 (z=0.896), formally classified as a flat-spectrum radio quasar. Using 19 months of all-sky survey Fermi/LAT data, we detect a gamma-ray continuum extending up to an observed energy of 145 GeV, and furthermore we find no evidence of gamma-ray variability in the source over its observed history. We illustrate the implications of these results in two different domains. First, we investigate the origin of the steady gamma-ray emission, where we re-examine the common classification of 4C +55.17 as a quasar-hosted blazar and consider instead its possible nature as a young radio source. We analyze and compare constraints on the source physical parameters in both blazar and young radio source scenarios by means of a detailed multiwavelength analysis and theoretical modeling of its broad-band spectrum. Secondly, we show that the gamma-ray spectrum may be formally extrapolated into the very-high energy (VHE; >= 100 GeV) range at a flux level detectable by the current generation of ground-based Cherenkov telescopes. This enables us to place constraints on models of extragalactic backgro

Author
McConville, W.; Ostorero, L.; Moderski, R.; Stawarz, Ł.; Cheung, C. C.; Ajello, M.; Bouvier, A.; Bregeon, J.; Donato, D.; Finke, J.; Furniss, A.; McEnery, J. E.; Monzani, M. E.; Orienti, M.; Reyes, L. C.; Rossetti, A.; Williams, D. A.
Published
2011
Language
EN

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