标题： 活动星系核中绕核尘埃的发射线探测 显示英文标题

标题： Emission-Line Probes of Circumnuclear Dust in AGNs

摘要： 追溯因强烈耗尽到颗粒上的元素的发射线提供了一种探测活动星系核(AGNs)尘埃含量的方法。 例子包括红外[FeII]和光学[CaII]线。 关于[FeII]线的基础激发机制仍存在争议，这导致了赛弗特星系窄线区中铁气相丰度的相关分歧。 在这篇贡献中，我们强调[CaII]线作为检验声称颗粒破坏影响[FeII]线一致性测试的实用性。 在NGC 1068中沿着射电喷流最强的[FeII]发射位置寻找[CaII]发射，得到了一个强上限，但未检测到。 这个结果表明颗粒在其他方面显示出强烈冲击处理证据的区域中基本完好无损。 显示英文摘要

摘要： Emission lines that trace elements subject to strong depletion onto grains provide a means for probing the dust content of AGNs. Examples include infrared [FeII] and optical [CaII] lines. The excitation mechanisms underlying the [FeII] lines remain controversial, resulting in related disagreement over the gas-phase abundance of iron in Seyfert narrow-line regions. In this contribution we emphasize the utility of the [CaII] lines as a consistency test for claims of grain destruction affecting the [FeII] lines. A search for [CaII] emission in NGC 1068 at a location of strongest [FeII] emission along the radio jet yields a strong upper limit, but no detection. This result suggests that grains survive largely intact in a region that otherwise shows strong evidence of shock processing.