Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Locus of Highly Accreting AGNs on the M_BH--sigma Plane: Selections,
  Limitations, and Implications   We re-examine the locus of narrow line Seyfert 1 galaxies on the M_BH--sigma
(black hole mass--bulge velocity dispersion) plane in the light of the results
from large new optically selected samples. We find that (1) soft X-ray selected
NLS1s have a lower ratio of BH mass to \sigma^{4}_{[OIII]} than broad line
Seyfert 1 galaxies; this remains a robust statistical result contrary to recent
claims otherwise; (2) optically selected NLS1s have systematically lower
Eddington luminosity ratio compared to X-ray selected NLS1s; and (3) as a
result, the locus of NLS1s on the M_BH--sigma plane is affected by selection
effects. We argue that there is no single explanation for the origin of the
M_BH--sigma relation; instead tracks of galaxies on the M_BH--sigma plane
differ with redshift, consistent with the downsizing of AGN activity. If these
results at face value are incorrect, then the data imply that AGNs with high
Eddington accretion reside preferentially in relatively late type galaxies at
the present epoch, perhaps a more interesting result and a challenge to
theoretical models.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th