Probing intermediate Seyfert galaxies by Pa(beta) spectroscopy
Probing intermediate Seyfert galaxies by Pa(beta) spectroscopy
复制标题
通过 Pa(β) 光谱探测中间 Seyfert 星系
DOI：
10.1086/169359
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
N. Carleton
中科院分区：
文献类型：
--
作者：
H. Rix;G. Rieke;M. Rieke;N. Carleton
介绍了附近塞弗特星系样品的高分辨率光谱。之所以选择这些天体，是因为它们观测到的巴尔默衰减很陡。证明了Pa（β）在解开尘埃遮蔽或辐射转移效应导致观测到的大h - α / h - β比的有用性，并发现任何一种机制都可能占主导地位。在存在尘埃遮挡的情况下，人们发现，相对于硬x射线通量，去红线强度与未变红物体中的强度一致。提出了一种能很自然地反映严重变红agn的频率和变红量的尘埃分布模型。参39。
High-resolution spectroscopy at Pa(beta) of a sample of nearby Seyfert galaxies is presented. These objects have been selected because of their observed steep Balmer decrements. The usefulness of Pa(beta) in untangling whether dust obscuration or radiative transfer effects cause the large observed H-alpha/H-beta ratio is demonstrated, and it is found that either mechanism can be dominant. In the cases where dust obscuration is present it is found that the dereddened line strengths, relative to the hard X-ray flux, coincide with those found in unreddened objects. A model is proposed for the dust distribution which accounts naturally for the frequency of severely reddened AGNs and their amount of reddening. 39 refs.