Astronomy and Astrophysics Seminars
Gamma-ray Flares of PKS 1222+216: Implications on Emission and Particle Acceleration processes
by Mr. Pankaj Kushwaha (DAA - TIFR)
Monday, April 21, 2014
from
to
(Asia/Kolkata)
at Colaba Campus ( DAA Seminar Room A269 )
at Colaba Campus ( DAA Seminar Room A269 )
TIFR
Description |
PKS 1222+216 is a flat spectrum radio quasar, a class of blazars' characterize by high luminosity and presence of strong emission lines in its ultraviolet-Optical spectrum. Two prominent gamma-ray flare of about a week duration were detected by the Fermi-LAT in April and June 2010 with a rising time of ~day. The excellent photon statistics with continuous and broadband energy coverage of Fermi-LAT enable us to extract light-curves in different energy bands on daily and sub-daily timescales. The extracted light-curves shows variety of temporal characteristics and variability patterns with contrasting behavior during both flares. We will discuss the implications of these high energy flares on the theoretical study of emission and particle acceleration processes which cannot be explain by the radiative and adiabatic cooling alone. We will also present a time dependent model for 2nd LAT flare during which the source was detected at very high energy (E> 100 GeV) by the MAGIC observatory with a variability timescale of ~ 10 mintutes. |