Narrow-line Seyfert 1 Galaxies and the M BH - sigma Relation - AstrophysicsReport as inadecuate

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Abstract: We have studied the location of narrow-line Seyfert 1 NLS1 galaxies andbroad-line Seyfert 1 BLS1 galaxies on the M BH - sigma relation of non-activegalaxies. We find that NLS1 galaxies as a class - as well as the BLS1 galaxiesof our comparison sample - do follow the M BH-sigma relation of non-activegalaxies if we use the width of the SII6716,6731 emission lines as surrogatefor stellar velocity dispersion, sigma *. We also find that the width ofOIII5007 is a good surrogate for sigma *, but only after a removal ofasymmetric blue wings, and, more important, after b excluding core OIIIlines with strong blueshifts i.e., excluding galaxies which have their OIIIvelocity fields dominated by radial motions, presumably outflows. The samegalaxies which are extreme outliers in OIII still follow the M BH - sigmarelation in SII. We confirm previous findings that NLS1 galaxies aresystematically off-set from the M BH - sigma relation if the full OIIIprofile is used to measure sigma. We systematically investigate the influenceof several parameters on the NSL1 galaxies- location on the M BH - sigma plane:OIII core blueshift, L-L Edd, intensity ratio FeII-H beta, NLR density, andabsolute magnitude. Implications for NLS1 models and for their evolution alongthe M BH - sigma relation are discussed.

Author: S. Komossa MPE, D. Xu NAOC


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