The 3.4-μm absorption feature towards the nucleus of NGC 5506

被引：16

作者：

Imanishi, M ^{[1
]}

机构：

[1] Natl Astron Observ, Tokyo 1818588, Japan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2000年 / 313卷 / 01期

关键词：

galaxies : active; galaxies : individual : NGC 5506; galaxies : ISM; galaxies : nuclei; infrared : galaxies;

D O I：

10.1046/j.1365-8711.2000.03224.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the results of 3-mu m spectroscopy towards the nucleus of a nearby Seyfert 2 galaxy, NGC 5506. A weak absorption feature of carbonaceous dust is detected at similar to 3.4 mu m The optical depth ratio of the 3.4-mu m carbonaceous dust absorption to the 9.7-mu m silicate dust absorption is smaller by more than a factor of 2 than that in the interstellar medium in our Galaxy. The small ratio is consistent with the idea that the obscuration towards the nucleus of NGC 5506 is caused mainly by dust grains in its host galaxy (type S0/a) and that the contribution of carbonaceous dust grains to the visual extinction there is smaller than that in our Galaxy (type Sb/bc).

引用

页码：165 / 169

页数：5

共 34 条

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