Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black Holes and Host Galaxies of NLS1s   Recently, reliable mass estimates for the central black holes in AGN became
feasible due to emission-line reverberation techniques. Using this method as a
calibrator, it is possible to determine black hole masses for a wide range of
AGN, in particular NLS1s. Do NLS1s have smaller black holes than ordinary
Seyfert 1 galaxies? Are their black holes smaller compared to the sizes of
their host galaxies? Do they have larger L/M ratios? Do NLS1s have hotter
accretion disks? I confront these questions with accretion disk theory and with
the data, showing that the above may well be the case.

8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con