SIMBAD references

Using a sample of 24 264 optically selected active galactic nuclei (AGNs) from the SDSS DR7 data base, we characterize how the profile of the [Oiii] λ5007 emission line relates to bolometric luminosity (LAGN), Eddington ratio, radio loudness, radio luminosity (L1.4GHz) and optical class (i.e. broad/narrow-line Seyfert 1, type 2) to determine what drives the kinematics of this kpc-scale line emitting gas. First, we use spectral stacking to characterize how the average [Oiii] λ5007 profile changes as a function of these five variables. After accounting for the known correlation between LAGN and L1.4GHz, we report that L1.4GHz has the strongest influence on the [Oiii] λ5007 profile, with AGNs of moderate radio luminosity (L1.4GHz = 1023-1025 WHz-1) having the broadest [Oiii] λ5007 profiles. Conversely, we find only a modest change in the [Oiii] λ5007 profile with increasing radio loudness and find no significant difference between the [Oiii] λ5007 profiles of broad- and narrow-line Seyfert 1s. When binned according to Eddington ratio, only the AGNs in our highest bin (i.e. >0.3) show any signs of having broadened [Oiii] λ5007 profiles, although the small numbers of such extreme AGNs in our sample mean we cannot rule out that other processes (e.g. radio jets) are responsible for this broadening. The [Oiii] λ5007 profiles of type 1 and type 2 AGNs show the same trends in terms of line width, but type 1 AGNs display a much stronger `blue wing', which we interpret as evidence of outflowing ionized gas. We perform multicomponent fitting to the Hβ, [Oiii] λλ4959, 5007, [Nii] λλ6548, 6584 and Hα lines for all the AGNs in our sample to calculate the proportions of AGNs with broad [Oiii] λ5007 profiles. The individual fits confirm the results from our stacked spectra; AGNs with L1.4GHz > 1023 WHz-1 are roughly five times more likely to have extremely broad [Oiii] λ5007 lines (full width at half-maximum, FWHMAvg > 1000kms-1) compared to lower L1.4GHz AGNs, and the width of the [Oiii] λ5007 line peaks in moderate-radio-luminosity AGNs (L1.4GHz ∼ 1024 WHz-1). Our results are consistent with the most disturbed gas kinematics being induced by compact radio cores (rather than powerful radio jets), although broadened [Oiii] λ5007 lines are also present, but much rarer, in low-L1.4GHz systems. Our catalogue of multicomponent fits is freely available as an online resource for statistical studies of the kinematics and luminosities of the narrow- and broad-line AGN regions and the identification of potential targets for follow-up observations at http://sites.google.com/site/sdssalpaka.