http://arxiv.org/abs/1608.02396
It is not well known yet if Narrow Line Seyfert 1 (NLS1) galaxies follow the M$_{BH}$-$\sigma$ relation found for normal galaxies. Emission lines like [SII] or [OIII]5007 have been used as surrogate of the stellar velocity dispersion and different results have been obtained. On the other hand, some AGN have shown Balmer emission with an additional intermediate component (IC), besides the well known narrow and broad ones. The properties of this IC have not been well studied yet. In order to re-examine the location of NLS1 in the M$_{BH}$-$\sigma$ relation, we test some emission lines like the narrow component (NC) of H$\alpha$ and the forbidden [NII]6548,6584 and [SII]6716,6731 lines as replacement of $\sigma$. On the other hand, we study the properties of the IC of H$\alpha$ found in 14 galaxies of the sample to find a link between it and the central engine and the remaining lines. We also compare the emission among the broad component (BC) of H$\alpha$ and those emitted at the narrow line region (NLR) in order to detect differences in the ionizing source in each emitting region. We have obtained and studied medium-resolution spectra (170 km s$^{-1}$ FWHM at H$\alpha$) of 36 NLS1 galaxies in the optical range 5800 – 6800{\AA}. For our sample we obtained black hole (BH) masses in the range log (M$_{BH}$/M$_{\odot}$) = 5.4 – 7.5. We found that in general, most of the galaxies lie bellow the M$_{BH}$-$\sigma$ relation when the NC of H_alpha, [SII] and [NII] lines are used as a surrogate of $\sigma$. Besides this, we found that 13 galaxies show an IC, being most of them it in the velocity range 700 – 1500 km s$^{-1}$ (the same range that show other AGN types) and it is well correlated with the FWHM of BC and therefore with the BH mass. On the other hand, we found that there is a tend between the luminosity of the BC of H$\alpha$ and NC, IC, [NII]6584, and [SII] lines.
E. Schmidt, D. Ferreiro, L. Vega, et. al.
Tue, 9 Aug 16
56/71
Comments: Accepted to be published in the A&A
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