Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An extinction free AGN selection by 18-band SED fitting in mid-infrared
  in the AKARI NEP deep field   We have developed an efficient Active Galactic Nucleus (AGN) selection method
using 18-band Spectral Energy Distribution (SED) fitting in mid-infrared
(mid-IR). AGNs are often obscured by gas and dust, and those obscured AGNs tend
to be missed in optical, UV and soft X-ray observations. Mid-IR light can help
us to recover them in an obscuration free way using their thermal emission. On
the other hand, Star-Forming Galaxies (SFG) also have strong PAH emission
features in mid-IR. Hence, establishing an accurate method to separate
populations of AGN and SFG is important. However, in previous mid-IR surveys,
only 3 or 4 filters were available, and thus the selection was limited. We
combined AKARI's continuous 9 mid-IR bands with WISE and Spitzer data to create
18 mid-IR bands for AGN selection. Among 4682 galaxies in the AKARI NEP deep
field, 1388 are selected to be AGN hosts, which implies an AGN fraction of
29.6$\pm$0.8$\%$ (among them 47$\%$ are Seyfert 1.8 and 2). Comparing the
result from SED fitting into WISE and Spitzer colour-colour diagram reveals
that Seyferts are often missed by previous studies. Our result has been tested
by stacking median magnitude for each sample. Using X-ray data from Chandra, we
compared the result of our SED fitting with WISE's colour box selection. We
recovered more X-ray detected AGN than previous methods by 20$\%$.

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The categories of this paper are: nlin
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph