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Date and Time of the Query: 2019-06-19 T01:59:37 PDT
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For refcode 2003AJ....125.1729N:
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Copyright by American Astronomical Society. Reproduced by permission
2003AJ....125.1729N Iron Is Not Depleted in High-Ionization Nuclear Emission-Line Regions of Active Galactic Nuclei Tohru Nagao, Takashi Murayama, Yasuhiro Shioya, and Yoshiaki Taniguchi Abstract. To examine whether or not high-ionization nuclear emission-line regions (HINERs) in narrow-line regions of active galactic nuclei are dusty, we focus on two high-ionization forbidden emission lines, [Fe vii] {lambda}6087 and [Ne v] {lambda}3426. We perform photoionization model calculations to investigate possible dependences of the flux ratio of [Fe vii] {lambda}6087/[Ne v] {lambda}3426 on various gas properties, in order to investigate how useful this flux ratio is to explore the dust abundances in HINERs. Based on our photoionization model calculations, we show that the observed range of the flux ratio of [Fe vii] {lambda}6087/[Ne v] {lambda}3426 is consistent with the dust-free models, while it cannot easily be explained by the dusty models. This suggests that iron is not depleted in HINERs, which implies that the HINERs are not dusty. This result is consistent with the idea that the HINERs are located closer than the dust-sublimation radius (i.e., the inner radius of dusty tori) and thus can be hidden by dusty tori when seen from a edge-on view toward the tori, which is also suggested by the AGN-type dependence of the visibility of high-ionization emission lines.
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