X-Ray Properties of Narrow Line Seyfert 1Galaxies
2018
The Fermi gamma-ray space telescope launched in the year 2008 has detected gamma
ray emission in about half-a-dozen Narrow Line Seyfert 1 (NLSy1) galaxies, a class of
active galactic nuclei (AGN). This has led to the unambiguous presence of relativistic
jets in these sources. This discovery has also led to the identification of NLSy1 galaxies
as a new population of extragalactic gamma ray emitting sources in addition to
blazars and radio galaxies. This discovery of gamma ray emission in a minority of
NLSy1 galaxies has thrown open many questions on the nature of the population of
NLSy1 galaxies. In this project, we aim to understand the X-ray properties of a large
sample of NLSy1 galaxies to (i) understand their general X-ray properties and (ii) to
compare how the X-ray properties of NLSy1 galaxies compare to the blazar class of
AGN, a dominant population of extragalactic gamma-ray emitting AGN. To achieve
the above objectives, analysis of the spectral and timing properties of a large sample
of NLSy1 galaxies was carried out. The data towards this project was taken from
both XMM-Newton and NuSTAR. In this report we present results on our analysis
of one NLSy1 galaxy PMN J0948+0022 using NuSTAR observation and 21 NLSy1
galaxies using XMM-Newton observations. From XMM-Newton observations, the
sources are found to show X-ray flux variations with an average variability amplitude
of 0.16⁺⁰.⁰²-₀.₀₂. The spectra were fitted with a simple power law with a photon
index 2.41⁺⁰.⁰²-₀.₀₂. The flux variability nature as well as the spectral properties of these
source are similar to what is known for blazars.
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