Abstract Details
| Name: Namrata Roy Affiliation: Presidency University Conference ID: ASI2016_849 Title : Properties of Gamma-Ray and Optical Outbursts of Fermi Blazars Authors and Co-Authors : Dr. Ritaban Chetterjee Presidency University Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : A large database of blazar variability is being built through Fermi and supporting multi-wavelength observations during the last seven years. These data regularly have a time resolution of a day and sometimes of hours. We analyze the Fermi-LAT and SMARTS R-band light curves of a large sample of blazars to study the symmetry of the outbursts, i.e., if those have similar rise and decay timescales. We find that longer-timescale (greater than 10 days) outbursts are symmetric while some of the short-timescale (less than 1-2 days) flares are asymmetric. We use a numerical model of non-thermal emission in blazar jets to investigate the possible cause of this asymmetry in short-term outbursts other than the obvious reason, namely, faster acceleration and slower cooling. These include specific location of the relevant emission region(s) in the jet w.r.t. our line of sight, and strength of the external photon field. From this we can probe the radiative loss timescales in blazar jets and find out other related parameters. |