Broad- and narrow-line Seyfert 1 galaxies

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.