Are Narrow-Line Seyfert 1s Fueled by Secular Evolution?

Details Are Narrow-Line Seyfert 1s Fueled by Secular Evolution? Are Narrow-Line Seyfert 1s Fueled by Secular Evolution?

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99r.143r&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.143

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Scientific paper

Narrow-Line Seyfert 1 galaxies (NLS1s) are a curious subset of active galactic nuclei, displaying an overall spectral signature consistent with a Seyfert 1 galaxy but with remarkably narrow permitted emission lines. As with all AGN, the source of the intense non-thermal radiation emitted by these objects is widely accepted to be accretion onto supermassive black holes lurking at the centres of the host galaxies. To account for the unusual spectral properties, it has been postulated that NLS1s possess relatively lower-mass black holes accreting material at a significant fraction of their Eddington limits. In order to test this hypothesis, we have analyzed high-spatial resolution NIR data obtained with the KIR/AOB system at CFHT. Using the two-dimensional decomposition algorithm GALFIT, J- and K'- band images of a sample of 11 NLS1s were separated into their constituent components. Blackhole masses were then determined by applying the established correlation between mass and host bulge luminosity, recalibrated for NIR wavelengths using 2MASS data. We have found that the NLS1s in our sample do not follow the correlation between black-hole mass and stellar velocity dispersion exhibited by other active galaxies. Numerical simulations recently published by Di Matteo et al. (2005) suggest that the mass-velocity dispersion correlation is the product of galaxy mergers, which can initiate the transport of fuel to an otherwise dormant black hole. The departure from this relation for NLS1s may therefore reveal that the underlying trigger in these objects is secular evolution rather than violent interactions.

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