2001A&A...365L.353S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:10:33

2001A&A...365L.353S - Astronomy and Astrophysics, volume 365, L353-356 (2001/1-3)

The obscured mid-infrared continuum of NGC 4418: A dust- and ice-enshrouded AGN.

SPOON H.W.W., KEANE J.V., TIELENS A.G.G.M., LUTZ D. and MOORWOOD A.F.M.

Abstract (from CDS):

We report the detection of absorption features in the 6-8µm 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 NGC 4418 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.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4418 - galaxies: ISM - galaxies: Seyfert - infrared: ISM: lines and bands

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IRAS F00183-7111 Sy2 00 20 34.7 -70 55 27     20.6     ~ 121 0
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
3 NGC 4355 Sy2 12 26 54.628 -00 52 39.51   14.21 13.37     ~ 404 2
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3446 3
5 GCS 3 IR 17 46 15 -28 49.6           ~ 51 0
6 W 33a Y*O 18 14 39.0 -17 52 03           ~ 584 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:10:33

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