The detection of significant \gamma -ray emission from radio-loud narrow line Seyfert 1 ( NLSy1s ) galaxies enables us to study jets in environments different than those in blazars .
However , due to the small number of known \gamma -ray emitting NLSy1 ( \gamma -NLSy1 ) galaxies , a comprehensive study could not be performed .
Here we report the first detection of significant \gamma -ray emission from four active galactic nuclei ( AGN ) , recently classified as NLSy1 from their Sloan Digital Sky Survey ( SDSS ) optical spectrum .
Three flat spectrum radio quasars ( FSRQs ) present in the third Large Area Telescope AGN catalog ( 3LAC ) are also found as \gamma -NLSy1 galaxies .
Comparing the \gamma -ray properties of these objects with 3LAC blazars reveals their spectral shapes to be similar to FSRQs , however , with low \gamma -ray luminosity ( \lesssim 10 ^ { 46 - 47 } erg s ^ { -1 } ) .
In the Wide-field Infrared Survey Explorer color-color diagram , these objects occupy a region mainly populated by FSRQs .
Using the H _ { \beta } emission line parameters , we find that on average \gamma -NLSy1 have smaller black hole masses than FSRQs at similar redshifts .
In the low-resolution SDSS image of one of the \gamma -NLSy1 source , we find the evidence of an extended structure .
We conclude by noting that overall many observational properties of \gamma -NLSy1 sources are similar to FSRQs and therefore , these objects could be their low black hole mass counterparts , as predicted in the literature .