Abstract Details

Name: Sanna Gulati
Affiliation: Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education
Conference ID: ASI2021_521
Title : Multiwavelength studies of active galaxies NGC 1275 and Pictor A
Authors and Co-Authors : Sanna Gulati (Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education), Debbijoy Bhattacharya (Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education), Subir Bhattacharyya (Bhabha Atomic Research Centre), Nilay Bhatt (Bhabha Atomic Research Centre), C. S. Stalin (Indian Institute of Astrophysics), V. K. Agrawal (U R Rao Satellite Centre), M. C. Ramadevi (U R Rao Satellite Centre)
Abstract Type : Oral
Abstract Category : Extragalactic Astronomy
Abstract : Active galaxies with large jet inclination angles are called Misaligned active galaxies (MAGN). Though gamma-ray emission, which primarily originates in the jet, is expected to fall off rapidly with increasing jet inclination angle, Fermi gamma-ray space telescope (Fermi) detected ~50 MAGNs in gamma-rays till date. We have carried out a detailed study of two gamma-ray detected MAGNs utilising observations from Fermi, Swift and AstroSat. While carrying out a decade-long study of one of the brightest MAGN in gamma-rays, NGC 1275, we noticed a long-term multiband flux increase. Also, a significant shift of the synchrotron peak frequency was noticed during the AstroSat observing period when the source was in high gamma-ray activity state. We also carried out a detailed study of a nearby radio galaxy, Pictor A, which exhibits a prominent north-western hotspot in IR, optical and X-ray bands. We detected the hotspot for the first time in both near-UV and far UV bands utilising observations from AstroSat-UVIT. Detailed findings of these two sources will be discussed.