Fermi Large Area Telescope Observations of a Candidate Young Radio Source

Details Fermi Large Area Telescope Observations of a Candidate Young Radio Source Fermi Large Area Telescope Observations of a Candidate Young Radio Source

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710603m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #106.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Mathematics

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Scientific paper

Using 19 months of Fermi LAT data, we investigate the gamma-ray properties of the radio-loud active galaxy 4C+55.17 (z=0.896) and re-examine its classification as a quasar-hosted blazar, considering instead its possible nature as a gamma-ray emitting young radio source. The active galaxy 4C+55.17 has a history of gamma-ray observations dating back to the EGRET era. Commonly classified as a Flat Spectrum Radio Quasar (FSRQ) due to its radio spectral shape and broad optical emission lines, the association of the EGRET source with 4C+55.17 remained tentative at the time, as the source exhibited spectral and morphological properties that were unlike any of the other bright gamma-ray blazars. With the improved angular resolution and sensitivity of the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, the association of the gamma-ray source with 4C+55.17 is now confirmed due to the precise gamma-ray localization. An investigation of the gamma-ray properties of this source has revealed it to be an atypical member of the gamma-ray emitting FSRQ's, with an unusually hard and non-variable gamma-ray spectrum which extends up to the observed photon energies of 145 GeV despite its considerably high redshift for a very-high energy (>100 GeV) emitter. We further show that the high energy (>100 MeV) spectrum of this source may be formally extrapolated into the detectable range of ground-based Cherenkov telescopes, making it a compelling candidate for very-high energy observations, and in particular for future studies of the extragalactic background light.

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