2004A&A...423..549D


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET21:26:26

2004A&A...423..549D - Astronomy and Astrophysics, volume 423, 549-558 (2004/8-4)

Organic matter in Seyfert2 nuclei: Comparison with our Galactic Center lines of sight.

DARTOIS E., MARCO O., MUNOZ CARO G.M., BROOKS K., DEBOFFLE D. and D'HENDECOURT L.

Abstract (from CDS):

We present ESO - Very Large Telescope and ESA - Infrared Space Observatory 3 to 4µm spectra of Seyfert 2 nuclei as compared to our galactic center lines of sight. The diffuse interstellar medium probed in both environments displays the characteristic 3.4µm aliphatic CH stretch absorptions of refractory carbonaceous material. The profile of this absorption feature is similar in all sources, indicating the CH2/CH3 ratios of the carbon chains present in the refractory components of the grains are the same in Seyfert 2 inner regions. At longer wavelengths the circumstellar contamination of most of the galactic lines of sight precludes the identification of other absorption bands arising from the groups constitutive of the aliphatics seen at 3.4µm. The clearer continuum produced by the Seyfert 2 nuclei represents promising lines of sight to constrain the existence or absence of strongly infrared active chemical groups such as the carbonyl one, important to understand the role of oxygen insertion in interstellar grains. The Spitzer Space Telescope spectrometer will soon allow one to investigate the importance of aliphatics on a much larger extragalactic sample.

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Journal keyword(s): ISM: dust, extinction - ISM: evolution - galaxies: active - galaxies: ISM

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4176 2
2 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 1013 0
3 RAFGL 2003 IR 17 45 39.1 -29 00 23           ~ 22 0
4 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 350 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3597 3
6 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11991 0
7 LHO 84 WR* 17 46 14.77 -28 49 34.2           WC9d 27 0
8 NAME Superantennae Sy2 19 31 21.4252803168 -72 39 21.448768732   17.39 16.37 14.65   ~ 279 2
9 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15   ~ 480 1

    Equat.    Gal    SGal    Ecl

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