2007A&A...463..635D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET12:44:06

2007A&A...463..635D - Astronomy and Astrophysics, volume 463, 635-640 (2007/2-4)

IRAS 08572+3915: constraining the aromatic versus aliphatic content of interstellar HACs.

DARTOIS E., GEBALLE T.R., PINO T., CAO A.-T., JONES A., DEBOFFLE D., GUERRINI V., BRECHIGNAC P. and D'HENDECOURT L.

Abstract (from CDS):

We analyze dust features present in the mid-infrared (Spitzer) and recently published L-band (UKIRT) spectra of the infrared galaxy IRAS 08572+3915. The line of sight toward the AGN nucleus crosses a high column density of carbonaceous dust whose characteristic absorption features appear clearly. They provide a real insight into the chemical environment of the diffuse interstellar medium. Thanks to the moderate redshift of IRAS 08572+3915, the wavelength of the aromatic CH stretching mode is free of major telluric lines, and a strong observational constraint of Hsp2/Hsp3≤0.08 has been determined. This limit clearly shows that the bonding of hydrogen atoms in interstellar hydrogenated amorphous carbon is highly aliphatic. The presence of a broad absorption feature centered at 6.2µm, probably arising from olefinic/aromatic structures, corresponds to the backbone of this carbonaceous material, which is the major carbon-containing component of the interstellar medium along this line of sight.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: dust, extinction - galaxies: individual: IRAS 08572+3915 - galaxies: ISM

Simbad objects: 2

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Number of rows : 2

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 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 360 1
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11085 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-12:44:06

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