"Softer when brighter" behavior at gamma rays of the BL Lac Object PKS 2155-304

Details "Softer when brighter" behavior at gamma rays of the BL Lac Object PKS 2155-304 "Softer when brighter" behavior at gamma rays of the BL Lac Object PKS 2155-304

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2947....1f&link_type=abstract

The Astronomer's Telegram, #2947

Physics

Gamma Ray, > Gev, Agn, Blazar, >Gev, A Comment

Scientific paper

In the recent ATel #2944, Ciprini et al. reported about a bright outburst at gamma rays of the BL Lac Object PKS 2155-304 (z=0.116). They wrote: "A preliminary estimate of the photon index (2.6±0.3) points out a rather soft gamma-ray spectrum on this daily interval, unusual for this type of BL Lac objects." However, this is not so unusual in BL Lac Objects. In a poster presented at the 38th COSPAR Scientific Assembly (Bremen, Germany, 18-25 July 2010) at the event "E11 Time Variability at High Energies: A Probe of AGN Physics (including VLBI)", Foschini et al.

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