“…In addition to the criterion of FWHM(Hβ), two extreme optical characteristics such as relatively weak [O III ] and strong permitted Fe ii emission lines with [O III ] λ5007 /Hβ < 3 are used to define the NLSy1 galaxy (Shuder & Osterbrock, 1981). Moreover, NLSy1 galaxies (NLSy1s) also display other utmost observational characteristics such as steep soft X-ray spectra, rapid X-ray (in optical sometimes) flux variability, strong soft X-ray excess below 2 keV, and blue-shifted line profile (e.g., Brandt et al, 1997;Leighly, 1999;Vaughan et al, 1999;Komossa & Meerschweinchen, 2000;Miller et al, 2000;Zamanov et al, 2002;Klimek et al, 2004;Leighly & Moore, 2004;Boroson, 2005;Liu et al, 2010;Paliya et al, 2013a;Kshama et al, 2017;Ojha et al, 2019Ojha et al, , 2020b. It is believed that NLSy1s are young active galactic nuclei (AGNs) and represents an earlier stage in their evolution (e.g., Mathur, 2000;Sulentic et al, 2000;Mathur et al, 2001;Fraix-Burnet et al, 2017;Komossa, 2018;Paliya, 2019).…”