Multiwavelength observations of the TeV blazar MRK 501 in March 1996. The first report of the detection by EGRET

Details Multiwavelength observations of the TeV blazar MRK 501 in March 1996. The first report of the detection by EGRET Multiwavelength observations of the TeV blazar MRK 501 in March 1996. The first report of the detection by EGRET

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aph....11..149k&link_type=abstract

Astroparticle Physics, Volume 11, Issue 1-2, p. 149-151.

Physics

16

Scientific paper

We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET, Whipple, and optical telescopes. We report here for the first time the detection of a GeV gamma-ray flux from Mrk 501 with EGRETwith 3.5 sigma significance (E > 100 MeV). A higher flux was also observed in April/May 1996, with 4.0sigma significance for E > 100 MeV, and 5.2 sigma significance for E > 500 MeV. We find that the multiband spectrum in March 1996 is consistent with that calculated from a one-zone SSC model, except for the extremely `flat' TeV spectrum. We show that the discrepancy cannot be explained by either second order Comptonization or the contribution of the `seed' IR photons from the host galaxy.

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