Black hole growth by accretion

@article{Grupe2004BlackHG,
  title={Black hole growth by accretion},
  author={Smita MathurDirk Grupe},
  journal={Astronomy and Astrophysics},
  year={2004},
  volume={432},
  pages={463-466}
}
We show that black holes grow substantially by accretion at close to Eddington rates. Using a complete sample of soft X-ray selected AGNs, Grupe & Mathur (2004, ApJ, 606, L41) have shown that narrow line Seyfert 1 galaxies, as a class, lie below the MBH-σ relation of normal galaxies. Some NLS1s, however, lie on or close to the MBH-σ relation. Here we show that not all NLS1s accrete at close to Eddington rates: those with low L/LEddington are close to the MBH-σ relation, and those with high L… 

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