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Figure 1: Images of the observed sources, showing the inclination of the host Seyfert 2 galaxies and where dust obscuration is evident, were retrieved from the NED database (http://nedwww.ipac.caltech.edu/).From left to right, up to down: NGC 7172 (Canada-France-Hawaii Telescope, Hickson (1994)), NGC 1068 (2MASS K band, Jarrett et al. 2003), NGC 5506 (Hubble Space Telescope, 606 nm filter, Malkan et al. 1998) and IRAS 19254-7245 (Danish Telescope, Chatzichristou 2000). A vertical bar representing a 10'' scale has been drawn. |
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Figure 2:
Left: spectra of the observed sources and adopted local continua to
extract the 3.4 ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Figure 3:
A): Near and mid infrared spectra of two galactic center lines of
sights sampling the diffuse interstellar medium, and one Seyfert 2
inner region. All spectra are scaled as described, for clarity. The
adopted local continua used to establish the optical depth in the
absorption features are shown as dashed lines. B): Resultant optical
depth spectra comparing Galactic center dust absorptions and the one
seen along the Seyfert 2 nucleus line of sight of NGC 1068. The NIR (3-4 ![]() ![]() |
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Figure 4:
Transmittance spectra of a film of hexane ice ( left) and
2-nonanone ice ( right) deposited on a thick CsI window, at 10 K. Note the
fringes due to the plane parallel ice film acting as an infrared
Fabry-Perot. The meaning and use of the local maxima
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Figure 5:
Optical depth spectra of hexane, octane and decane at 10 K in the CH stretch infrared region of the spectrum, after fringes local baseline
correction. All spectra have been normalized to the antisymmetrical CH2 stretching mode around 3.42 ![]() |
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Figure 6:
Optical depth spectra of heptanone, nonanone and undecanone where the
carbonyl is either positionned at the end or the middle of the carbon
skeleton, after fringes local baseline correction, recorded at 10 K in
the CH stretch infrared region of the spectrum. All spectra have been
normalized to the antisymmetrical CH2 stretching mode around
3.42 ![]() |
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Figure 7:
Optical depth spectra of heptanone, nonanone and undecanone, where the
carbonyl is either positionned at the end or the middle of the carbon
skeleton, recorded at 10 K in the C=O stretch infrared region of the
spectrum. All spectra have been normalized to the antisymmetrical CH2 stretching mode around 3.42 ![]() |
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