Speaker
Description
In this paper, we will present the analysis of Suzaku/XIS, Swift/XRT, and Fermi-LAT data. We analyzed Suzaku/XIS data (taken from the year 2006 to 2015) and Fermi-LAT data (taken from the year 2008 to 2015) of the gamma-ray emitting radio galaxy NGC 1275. Correlated brightening of the nucleus in both the X-ray and GeV gamma-ray energy bands was found for the period 2013–2015. This is the first evidence of correlated variability between these two bands for NGC 1275. We also analyzed Swift/XRT data and found that the X-ray flux increased over several days in 2010. The GeV gamma-ray band also showed a higher flux with a harder spectrum during the 2010 flare. Simultaneous X-ray and GeV gamma-ray flux increase in the flare could be explained by the shock-in-jet scenario. On the other hand, a long-term gradual brightening of radio, X-ray, and GeV gamma-ray flux with a larger gamma-ray amplitude could have an origin other than internal shocks and some of these possibilities are discus
