Abstract Details
| Name: C S Stalin Affiliation: Indian Institute of Astrophysics Conference ID: ASI2015_767 Title : Narrow line Seyfert 1 galaxies: a new class of gamma-ray emitting AGN Authors and Co-Authors : C. S. Stalin & Vaidehi S. Paliya Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : The launch of the Fermi gamma-ray space telescope in the year 2008 has led to the discovery of gamma-ray emission from more than thousands of celestial sources based on the first two years of its operation. Considering only the extragalactic sky, blazars dominate the population of gamma-ray emitting sources. Prior to Fermi, only two classes of gamma-ray emitting AGN were known, namely radio galaxies and quasars. However, since the launch of Fermi, gamma-ray emission has also been detected in a total of five Narrow line Seyfert 1 (NLSy1) galaxies, which clearly demonstrates the existence of a third class of gamma-ray emitting AGN. The detection of gamma-rays from NLSy1 galaxies have established beyond doubt the presence of relativistic jets in these sources. However, it is generally thought that NLSy1 galaxies are hosted by spiral galaxies, and if it is true, then spiral galaxies can also launch relativistic jets. We have carried out a systematic study of these newly discovered gamma-ray emitting NLSy1 galaxies, using data in the optical from HCT, UV and X-rays from Swift/UVOT, Swift/XRT and Swift/BAT, and gamma-rays from Fermi. We have found that these new gamma-ray emitting NLSy1 galaxies have properties similar to the Flat Spectrum Radio Quasar (FSRQ) category of AGN. However, we find one of the gamma-ray emitting NLSy1 galaxies to have both the characteristics of a Seyfert galaxy and a FSRQ. |