The radio/gamma-ray connection in AGNs

La¨hteenma¨ki, A.; Valtaoja, E.; Tornikoski, M.
April 2000
AIP Conference Proceedings;2000, Vol. 510 Issue 1, p372
Academic Journal
We have continued the comparison of the Metsa¨hovi total flux density radio variations and EGRET gamma-ray observations from Cycles 1–4. This work compliments the arguments presented at the 4th Compton Symposium. We have also attempted to remove the effect that different radio and gamma-ray spectral indices have on the observed properties. We discuss the relationship between the two frequency regions and the consequences it has on the source modeling. It seems that the radio emission and the gamma-rays originate within the same shocked area of the relativistic jet and that the gamma-rays are most likely produced by the synchrotron self-Compton (SSC) mechanism. © 2000 American Institute of Physics.


Related Articles

  • Neutrino-emission from active galactic nuclei as a diagnostic tool. Schuster, Claudia; Pohl, Martin; Schlickeiser, Reinhard // AIP Conference Proceedings;2001, Vol. 587 Issue 1, p363 

    AGN, active galactic nuclei, are luminous objects at cosmological distances, which have been reported as sources of high energy γ-rays. The emission is probably nonthermal radiation from relativistic jets belonging to the AGN. Earlier investigations of these processes have suggested that...

  • The new metagalactic source of gamma-quanta with energy >10[sup 12] eV. Sinitsyna, V. G. // AIP Conference Proceedings;2000, Vol. 515 Issue 1, p293 

    Observatory SHALON ALATOO has just announced the TeV discovered of NGC 1275. The TeV catalogue of extragalactic sources contains three objects investigated by the SHALON-ALATOO Observatory at energy above 0.8 TeV: Markarian 421, Markarian 501 and NGC 1275, which was detected in TeV energy range...

  • The properties of the gamma-ray blazars in the CJ-F VLBI sample. Britzen, S.; Vermeulen, R. C.; Taylor, G. B.; Campbell, R. M.; Browne, I. W.; Wilkinson, P.; Pearson, T. J.; Readhead, A. C. S. // AIP Conference Proceedings;2001, Vol. 558 Issue 1, p721 

    We present first results from the analysis of multi-epoch VLBI observations of the EGRET detected sources in the CJ-F sample (Caltech Jodrell-Flat-spectrum,). These objects form a subsample of 14 sources within the 293 AGN of the full CJ-F sample. 5 GHz VLBI snapshot observations of the CJ-F...

  • Possible new identifications for Southern EGRET sources. Tornikoski, M.; La¨hteenma¨ki, A.; Lainela, M.; Valtaoja, E. // AIP Conference Proceedings;2001, Vol. 587 Issue 1, p673 

    We have made total flux density observations at high radio frequencies (90 and 230 GHz) of 12 Southern sources that were classified as possible ERGET identifications in the Third EGRET Catalog. Our observations confirm the blazar-nature of 9 of them. We have also studied sources that we...

  • Very high energy gamma ray observations of southern hemisphere AGNs. Chadwick, P. M.; Lyons, K.; McComb, T. J. L.; Orford, K. J.; Osborne, J. L.; Rayner, S. M.; Shaw, S. E.; Turver, K. E. // AIP Conference Proceedings;2001, Vol. 599 Issue 1, p570 

    A range of AGNs visible from the Southern hemisphere has been observed with the University of Durham Mark 6 very high energy gamma ray telescope. Results of observations of 1ES 0323+022, PKS 0829+046, 1ES 1101-232, Cen A, PKS 1514-24, RKJ 10578-275, 1ES 2316-423, PKS 2005-489 and PKS 0548-322...

  • Extremely rapid bursts of TeV photons from the active galaxy Markarian 421. Gaidos, J.A.; Akerlof, C.W. // Nature;9/26/1996, Vol. 383 Issue 6598, p319 

    Describes the May 1996 observations of two outbursts of TeV photons from the active galaxy Markarian (Mrk421), a very high energy (VHE) gamma-ray source. The observations by the Fred Lawrence Whipple Observatory; The largest flux from any VHE source recorded to date; The very short durations of...

  • 1D, 2D, 3D wavelet methods for gamma-ray source analysis. Ciprini, S.; Tosti, G.; Marcucci, F.; Cecchi, C.; Discepoli, G.; Bonamente, E.; Germani, S.; Impiombato, D.; Lubrano, P.; Pepe, M. // AIP Conference Proceedings;2007, Vol. 921 Issue 1, p546 

    An example of wavelet transforms applied to data from EGRET and data of the GLAST pre-launch simulations is reported. 1D wavelet transform can be an useful tool in the analysis of gamma-ray source variability, while 2D/3D wavelet transform is a potential partner tool of the standard Likelihood...

  • Gamma-ray emitting AGN and GLAST. Padovani, P. // AIP Conference Proceedings;2007, Vol. 921 Issue 1, p19 

    I describe the different classes of Active Galactic Nuclei (AGN) and the basic tenets of unified schemes. I then review the properties of the extragalactic sources detected in the GeV and TeV bands, showing that the vast majority of them belong to the very rare blazar class. I further discuss...

  • The host galaxy and Fermi-LAT counterpart of HESS J1943+213. Peter, D.; van derWel, A.; Gässler, W.; Domainko, W.; Sanchez, D. A. // Astronomy & Astrophysics / Astronomie et Astrophysique;Nov2014, Vol. 571, p1 

    Context. The very-high energy (VHE, E > 100 GeV) gamma-ray sky shows diverse Galactic and extragalactic source populations. For some sources the astrophysical object class could not be identified so far. Aims. The nature (Galactic or extragalactic) of the VHE gamma-ray source HESS J1943+213 is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics