Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supermassive Black Holes with High Accretion Rates in Active Galactic
  Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1
  Galaxies   This is the third in a series of papers reporting on a large
reverberation-mapping campaign aimed to study the properties of active galactic
nuclei (AGNs) with high accretion rates. We present new results on the
variability of the optical Fe II emission lines in 10 AGNs observed by the
Yunnan Observatory 2.4m telescope during 2012--2013. We detect statistically
significant time lags, relative to the AGN continuum, in nine of the sources.
This accurate measurement is achieved by using a sophisticated spectral fitting
scheme that allows for apparent flux variations of the host galaxy, and several
narrow lines, due to the changing observing conditions. Six of the newly
detected lags are indistinguishable from the Hbeta lags measured in the same
sources. Two are significantly longer and one is slightly shorter. Combining
with Fe II lags reported in previous studies, we find a Fe II
radius--luminosity relationship similar to the one for Hbeta, although our
sample by itself shows no clear correlation. The results support the idea that
Fe II emission lines originate in photoionized gas which, for the majority of
the newly reported objects, is indistinguishable from the Hbeta-emitting gas.
We also present a tentative correlation between the lag and intensity of Fe II
and Hbeta and comment on its possible origin.

31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex