Abstract Details
| Name: ZAHIR AHMAD SHAH Affiliation: Department of Physics University of Kashmir Conference ID: ASI2016_695 Title : Multi-Wavelength Study of 3C454 During August 2015 Flaring Authors and Co-Authors : Pankaj Kushwaha (IUCAA), Sunder Sahayanathan(BARC Mumbai), Naseer Iqbal (Kashmir University), Ranjeev Misra(IUCAA) Abstract Type : Oral Abstract Category : Extragalactic astronomy Abstract : Blazars are the most powerful, highly energetic and rapidly varying at all wave-band radio loud AGN’s. They are known to posses the extremely collimated relativistic jets pointing towards the line of sight of observer, leading to the Doppler boosting of the Blazar jet emission. Blazars are classified as Bl-lacs and FSRQs based on the absence/weak or presence of emission lines in the optical band respectively. 3C454.3 is one of the most active, variable and powerful gamma ray emitter FSRQ (also catalogued as PKS 2251+158; z = 0.859). Over the years multiple episodes of gamma ray outbursts have been reported. A detailed study of recent flaring activity of Flat Spectrum Radio Quasar (FSRQ) 3C454 observed simultaneously in Gamma-ray, X-ray and Optical by various astronomical observatories during the period 2015 Aug 16- 2015 Aug 28 has been carried out during the period 2015 Aug 16- 2015 Aug 28. During this flaring highest flux of 1.8459162052×10−05 ±1.8198335927×10−06 photons/cm2/s was observed at MJD 57256.0625116 in a 3-hour binning. Also in the six hour binning we recorded a maximum gamma ray flux of 1.74111666309 × 10-05 ± 0.1306×10−05 photons/cm2/sec at MJD 57256.13. The multi-wavelength light curve obtained shows the source is highly variable and will help in diagnosing the location of emission region and physical mechanism responsible for the emission. Compared to one day binning light curve, where only one flaring event is visible, the six hour binning Fermi light curve being finer shows the outburst is composed of two consecutive flares characterized by rise and decay time scales of a day. These two successive flaring events are more visible in 3-hour binning light curve. We have selected three regions from the multi-wavelength light curve via Flaring region, Post flaring and quiescent region to have SED characteristic of the flaring during August 2015. |