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Variable gamma-ray emission has been discovered in five Radio-loud NarrowLine Seyfert 1 (NLSy1) galaxies by the Large Area Telescope (LAT) onboard theFermi Gamma-Ray Space Telescope. This has clearly demonstrated that these NLSy1galaxies do have relativistic jets similar to two other cases of gamma-rayemitting Active Galactic Nuclei (AGN), namely blazars and radio galaxies. Wepresent here our results on the multi-band analysis of two gamma-ray emittingNLSy1 galaxies namely PKS 1502+036 (z = 0.409) and PKS 2004-447 (z = 0.240)using archival data. We generate multi-band long term light curves of thesesources, build their spectral energy distribution (SED) and model them using anone zone leptonic model. They resemble more to the SEDs of the flat spectrumradio quasar (FSRQ) class of AGN. We then compare the SEDs of these two sourceswith two other Fermi detected AGN along the traditional blazar sequence, namelythe BL Lac Mrk 421 (z = 0.03) and the FSRQ 3C 454.3 (z = 0.86). The SEDs ofboth PKS 1502+036 and PKS 2004-447 are found to be intermediate to the SEDs ofMrk 421 and 3C 454.3. In the gamma-ray spectral index v/s gamma-ray luminosityplane, both these NLSy1 galaxies occupy a distinct position, wherein, they haveluminosity between Mrk 421 and 3C 454.3, however steep gamma-ray spectrasimilar to 3C 454.3. Their Compton dominance as well as their X-ray spectralslope also lie between Mrk 421 and 3C 454.3. We argue that the physicalproperties of both PKS 1502+036 and PKS 2004$-$447 are in general similar toblazars and intermediate between FSRQs and BL Lac objects and these sourcesthus could fit into the traditional blazar sequence.

The Nature of gamma-ray Loud Narrow Line Seyfert I Galaxies PKS 1502+036 and PKS 2004-447