Leipski, C.Haas, M.Meusinger, H.Siebenmorgen, R.Chini, R.Drass, H.Albrecht, M.Wilkes, BelindaHuchra, JohnOtt, S.Cesarsky, C.Cutri, R.2017-02-132007Leipski, C., M. Haas, H. Meusinger, R. Siebenmorgen, R. Chini, H. Drass, M. Albrecht, et al. 2007. “Narrow-Line AGN in the ISO-2MASS Survey .” Astronomy and Astrophysics 464 (3) (March): 895–901. doi:10.1051/0004-6361:20066168.0004-637Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30212168Context. 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 $\mu$m 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 [ $\ion{O}{iii}$] 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 $\mu$m 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.en-USGalaxies: activeGalaxies: quasars: generalInfrared: galaxiesJournal Article2017-02-1310.1086/511630