Evidence for biodegradation products in the interstellar medium

Details Evidence for biodegradation products in the interstellar medium Evidence for biodegradation products in the interstellar medium

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ijasb...9...29r&link_type=abstract

International Journal of Astrobiology, Volume 9, Issue 1, p. 29-34

Biology

Degradation Products Of Biomateria, Interstellar Dust, Panspermia, Polycyclic Aromatic Hydrocarbon, Interstellar Molecules

Scientific paper

The interstellar absorption band centred on 2175 Å that is conventionally attributed to monodisperse graphite spheres of radii 0.02 μm is more plausibly explained as arising from biologically derived aromatic molecules. On the basis of panspermia models, interstellar dust includes a substantial fraction of biomaterial in various stages of degradation. We have modeled such an ensemble of degraded biomaterial with laboratory spectroscopy of algae, grass pigments, bituminous coal and anthracite. The average ulrtraviolet absorption profile for these materials is centred at 2175 Å with a full width at half maximum of 250 Å, in precise agreement with the interstellar extinction observations. Mid-infrared spectra also display general concordance with the unidentified interstellar absorption features found in a wide variety of astronomoical sources.

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