Search For New Gamma-ray Seyfert-type 1 Galaxies And Study Of Their Multi-band Characteristic

Active galactic nuclei(AGNs)are important tools for studying supermassive black holes in the universe.At the same time,AGNs also play a significant role in the evolution of galaxies.The relativistic jet and accretion system of active galactic nuclei is the key component structure.The study of jets radio loud in Narrow Line Seyfert 1(NLS1)galaxies poses a challenge to the current understanding of the environmental dependence of jet generation.Currently,it is generally believed that relativistic jets often occur in active galactic nuclei with larger black hole masses and lower accretion rates.As the highest energy band of electromagnetic waves,gamma-rays have a close relationship with relativistic radiation particles,and are important probes for our study of relativistic jets.They are of great significance for us to understand the physical properties of relativistic jets of radio loud NLS1.So far,Fermi-LAT has discovered 13 gamma ray NLS1,and compared to 3743 blazars in the 4FGL dr3 gamma ray source catalog,the total number of samples for this type of gamma ray source is still small,making it difficult for people to systematically study it.The main purpose of our research is to expand the sample size of this type of source.In the main work of this article,a systematic search for gamma ray signals from nearly 500 radio loud NLS1 samples and 23 radio quiet NLS1 samples has been finished.We found a gamma-ray transient signal in the direction of a radio quiet NLS1 J1937 in the southern sky.In addition,we found a synergistic variation between the gamma ray source 4FGL J0959.6+4606 and the infrared band of SDSS J095909.51+460014.3,and the gamma-ray location at the high state time of4 FGL J0959.6+4606 gamma rays can correspond to SDSS J095909.51+460014.3,The physical parameters obtained by fitting the multi-band SED of SDSS J095909.51+460014.3 also show that their physical properties are similar to those of the previous gamma-ray NLS1.The low-energy band counterpart of the gamma ray source 4FGL J0959.6+4606 has been re certified as NLS1 SDSS J095909.51+460014.3.Due to the low redshift of the source,we can conduct further research by observing its host galaxy in future work.