High-Energy Gamma Rays from the BL Lacertae Object PKS 2155-304

Details High-Energy Gamma Rays from the BL Lacertae Object PKS 2155-304 High-Energy Gamma Rays from the BL Lacertae Object PKS 2155-304

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454l..93v&link_type=abstract

Astrophysical Journal Letters v.454, p.L93

Astronomy and Astrophysics

Astronomy

62

Gamma Rays: Observations, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: Pks 2155-304

Scientific paper

We present the first detection of gamma-ray emission from the extragalactic source PKS 2155-304, which is often considered to be a prototype of X-ray--selected BL Lacertae objects. The 30 MeV--10 GeV photon spectrum derived from measurements taken with EGRET on the Compton Observatory during 1994 November 15--29 indicates a very hard spectrum with a power-law spectral index of 1.71 +/- 0.24. This spectral hardness when combined with the proximity of the source (z = 0.116) makes it an excellent candidate for detection at TeV gamma-ray energies. We briefly discuss the implications of these gamma-ray measurements for models of BL Lac objects.

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