Gamma-Rays from Radio Galaxies: Fermi-Lat Observations

@article{Grandi2011GammaRaysFR,
  title={Gamma-Rays from Radio Galaxies: Fermi-Lat Observations},
  author={Paola Grandi and for the Star Collaboration},
  journal={arXiv: High Energy Astrophysical Phenomena},
  year={2011}
}
We review the high energy properties of Misaligned AGNs associated with gamma-ray sources detected by Fermi in 24 months of survey. Most of them are nearby emission low power radio galaxies (i.e FRIs) which probably have structured jets. On the contrary, high power radio sources (i.e FRIIs) with GeV emission are rare. The small number of FRIIs does not seem to be related to their higher redshifts. Assuming proportionality between the radio core flux and the gamma-ray flux, several of them are… 

Figures from this paper

Exploring the FRI/FRII radio dichotomy with the Fermi satellite
Misaligned Active Galactic Nuclei (MAGNs), i.e., radio galaxies and quasars with the jet not directly pointing at the observer, are a new class of GeV emitters. In low power radio galaxies (i.e.,
Gamma-Ray Observations of Active Galactic Nuclei
This article reviews the recent observational results regarding γ-ray emission from active galaxies. The most numerous discrete extragalactic γ-ray sources are AGNs dominated by relativistic jets
The γ-Ray Emission Region in the Fanaroff-Riley II Radio Galaxy 3C 111
The broad-line radio galaxy 3C 111, characterized by a Fanaroff-Riley II (FRII) radio morphology, is one of the sources of the misaligned active galactic nucleus sample, consisting of radio galaxies
SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy
We report Fermi Large Area Telescope (LAT) observations of the radio-loud active galactic nucleus SBS 0846+513 (z = 0.5835), optically classified as a narrow-line Seyfert 1 galaxy, together with new
Propagation and stability of relativistic jets
A simple look at the steady high-energy Universe reveals a clear correlation with outflows generated around compact objects (winds and jets). In the case of relativistic jets, they are thought to be
What powers the radio-loud narrow-line Seyfert 1 galaxy RX J2314.9+2243? - A view onto its central engine from radio to X-rays
Aims. Radio-loud narrow-line type 1 galaxies provide us with a fresh look at the blazar phenomenon, the causes of radio loudness, and the physics of jet formation. We present a multi-wavelength study
Unveiling Dark Matter through Gamma Rays : Spectral Features, Spatial Signatures and Astrophysical Backgrounds
Although the existence of Dark Matter (DM) is supported by multiple unrelated evidences at different scales, its intimate nature is far from been unveiled by current detection strategies. This thesis
Dissipative Processes and Their Role in the Evolution of Radio Galaxies
Particle acceleration in relativistic jets, to very high levels of energy, occurs at the expense of the dissipation of magnetic or kinetic energy. Therefore, understanding the processes that can
On radiative acceleration in spine–sheath structured blazar jets
It has been proposed that blazar jets are structured, with a fast spine surrounded by a slower sheath or layer. This structured jet model explains some properties of their emission and morphology.

References

SHOWING 1-10 OF 18 REFERENCES
DETECTION OF GAMMA-RAY EMISSION FROM THE STARBURST GALAXIES M82 AND NGC 253 WITH THE LARGE AREA TELESCOPE ON FERMI
We report the detection of high-energy gamma-ray emission from two starburst galaxies using data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. Steady point-like
FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87
We report the Fermi-LAT discovery of high-energy (MeV/GeV) gamma-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10 sigma in ten-months
The radio/gamma-ray connection in active galactic nuclei in the era of the fermi large area telescope
We present a detailed statistical analysis of the correlation between radio and gamma-ray emission of the active galactic nuclei (AGNs) detected by Fermi during its first year of operation, with the
Broad-Line Radio Galaxies: Jet Contribution to the Nuclear X-Ray Continuum
It is shown that for broad-line radio galaxies the strength of the nonthermal beamed radiation, when present, is always smaller than the accretion flow by a factor of <0.7 in the 2-10 keV band. This
γ-Ray spectral evolution of NGC 1275 observed with Fermi large area telescope
We report on a detailed investigation of the high-energy γ-ray emission from NGC 1275, a well-known radio galaxy hosted by a giant elliptical located at the center of the nearby Perseus cluster. With
Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251
NGC 6251 is a luminous radio galaxy≈ 104 Mpc away that was detected significantly with the Fermi Gamma-ray Space Telescope , and before that with EGRET (onboard the Compton Gamma-ray Observatory ).
The radio structures of southern 2-Jy radio sources
A subsample of the Wall & Peacock 2-Jy sample of radio sources, with redshift z<0.7 or unknown and declination δ<+10°, has been selected and observed in the radio at 6 cm (or information was obtained
Structured jets in TeV BL Lac objects and radiogalaxies. Implications for the observed properties
TeV BL Lacertae objects require extreme relativistic bulk motions in the gamma-ray emission region, but at the VLBI scale their radio knots hardly move. The same sources show evidence, in radio, of a
Relativistic and Slowing Down: The Flow in the Hotspots of Powerful Radio Galaxies and Quasars
Pairs of radio-emitting jets with lengths up to several hundred kiloparsecs emanate from the central region (the "core") of radio-loud active galaxies. In the most powerful of them, these jets
A lepto-hadronic model for high-energy emission from FR I radiogalaxies
Context. The well known radiogalaxy Cen A has been recently detected as a source of very high energy (VHE) γ-rays by the HESS experiment just before Fermi/LAT detected it at high energies (HE). The
...
1
2
...