We report here our comparative analysis of the active galactic nucleus (AGN) and star formation (SF) characteristics of a sample of narrow-line Seyfert 1 (NLS1) and broad-line Seyfert 1 (BLS1) galaxies. Our sample consisted of 373 BLS1 and 240 NLS1 galaxies and spanned the redshift 0.02<z<0.8. The broad-band spectral energy distribution, constructed using data from the ultra-violet to the far-infrared, was modelled using CIGALE to derive the basic properties of our sample. We searched for differences in stellar mass (M), star formation rate (SFR), and AGN luminosity (L_AGN_) in the two populations. We also estimated new radiation-pressure-corrected black hole masses for our sample of BLS1 and NLS1 galaxies. While the virial black hole mass (M_BH_) of BLS1 galaxies is similar to their radiation-pressure -corrected M_BH_ values, the virial M_BH_ values of NLS1 galaxies are underestimated. We found that NLS1 galaxies have a lower M_BH_ of log(M_BH_[M_{sun}])=7.45+/-0.27 and a higher Eddington ratio of log(lambda_Edd)=-0.72+/-0.22 than BLS1 galaxies, which have log(M_BH_[M_{sun}) and lambda_Edd values of 8.04+/-0.26 and -1.08+/-0.24, respectively. The distributions of M, SFR, and specific star formation (sSFR=SFR/M) for the two populations are indistinguishable. This analysis is based on an independent approach and contradicts reports in the literature that NLS1 galaxies have a higher SF than BLS1 galaxies. While we found that L_AGN_ increases with M, L_SF_ flattens at high M for both BLS1 and NLS1 galaxies. The reason may be that SF is suppressed by AGN feedback at M higher than ~10^11^M_{sun}_ or that the AGN fuelling mechanism is decoupled from SF. Separating the sample into radio-detected and radio-undetected subsamples, we found no difference in their SF properties suggesting that the effect of AGN jets on SF is negligible.

Cone search capability for table J/A+A/688/A32/table2 (BLS1 AGN and galaxy properties)

Cone search capability for table J/A+A/688/A32/table3 (NLS1 AGN and galaxy properties)

Cone search capability for table J/A+A/688/A32/tabled1 (BLS1 fluxes)

Cone search capability for table J/A+A/688/A32/tabled2 (NLS1 fluxes)