Journal
ASTRONOMY & ASTROPHYSICS
Volume 365, Issue 3, Pages L353-L356Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20000557
Keywords
galaxies : individual : NGC 4418; galaxies : ISM; galaxies : Seyfert; infrared : ISM : lines and bands
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We report the detection of absorption features in the 6-8 mum region superimposed on a featureless mid-infrared continuum in NGC 4418. For several of these features this is the first detection in an external galaxy We compare the absorption spectrum of NGC4418 to that; of embedded massive protostars and the Galactic centre, and attribute the absorption features to ice grains and to hydrogenated amorphous carbon grains. From the depth of the ice features, we infer that the powerful central source responsible for the mid-infrared emission must be deeply enshrouded. Since this emission is warm and originates in a compact region, an AGN must be hiding in the nucleus of NGC 4418.
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