Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Narrow-line AGN in the ISO-2MASS Survey   Context: A long-standing challenge of observational AGN research is to find
type 2 quasars, the luminous analogues of Seyfert-2 galaxies. Aims: We search
for luminous narrow-line type 2 AGN, characterise their properties, and compare
them with broad-line type 1 AGN. Methods: Combining the ISOCAM parallel survey
at 6.7 mu with 2MASS, we have selected AGN via near-mid-infrared colours caused
by the hot nuclear dust emission. We performed spectroscopy in the optical and,
for a subset of the sample, also in the mid-infrared with Spitzer. Results: We
find nine type 2 AGN at redshift 0.1<z<0.5, three of them have even quasar-like
[OIII] luminosities. At the given redshift and luminosity range the number of
type 2 AGN is at least as high as that of type 1s. At z>0.5 we did not find
type 2 AGN, probably because the hottest dust emission, still covered by the
NIR filters, is obscured. The optical spectra of the type 2 host galaxies show
young and old stellar populations. Only one object is an ultraluminous infrared
galaxy with starburst. The 5-38 mu spectra of the two type 2 sources observed
show a strong continuum with PAH emission in one case and silicate absorption
in the other case. Conclusions: The near-mid-infrared selection is a successful
strategy to find luminous type 2 AGN at low z. The objects exhibit a large
range of properties so that it is difficult to infer details by means of
popular SED fitting with simple average templates.

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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol