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

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

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...463..635d&link_type=abstract

Astronomy and Astrophysics, Volume 463, Issue 2, February IV 2007, pp.635-640

Astronomy and Astrophysics

Astrophysics

23

Ism: Abundances, Ism: Dust, Extinction, Galaxies:, Individual: Iras 08572+3915, Galaxies: Ism

Scientific paper

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 6.2 μm, 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.
Based on observations made with the Spitzer Space Telescope (GO-3336 program), which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407.
Based on data obtained at the United Kingdom Infrared Telescope, which is operated by the Joint Astronomy Center on behalf of the UK Particle Physics and Astronomy Research Council.
Part of this work has been financed by the french CNRS program "Physique et Chimie du Milieu Interstellaire" (PCMI-CNRS). TRG's esearch is supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., on behalf of the international Gemini partnership of Argentina, Australia, Brazil, Canada, Chile, the United Kingdom, and the United States of America.

Affiliated with

Also associated with

No associations

Rating

IRAS 08572+3915: constraining the aromatic versus aliphatic content of interstellar HACs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with IRAS 08572+3915: constraining the aromatic versus aliphatic content of interstellar HACs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IRAS 08572+3915: constraining the aromatic versus aliphatic content of interstellar HACs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-734195