Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.124..377y&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 124, no. 2, July 1986, p. 377-388.
Astronomy and Astrophysics
Astrophysics
8
Absorption Spectra, Astronomical Spectroscopy, Extraterrestrial Life, Interstellar Extinction, Interstellar Matter, Microorganisms, Bacteria, Infrared Spectra, Panspermia, Ultraviolet Spectra, Yeast
Scientific paper
The microorganism model of interstellar grains is investigated by spectroscopy from the infrared, visible to the ultraviolet (UV) wave regions. E. coli, yeast and spores of Bacillus subtilis exhibit absorption bands at lambda = 3.1 and 9.7 microns; they also exhibit several absorptions at 6 to about 8 microns which are in agreement with the observed IS extinction curves. To obtain the extinction curves in the visible and UV regions, dry films of microorganism are prepared on a MgF2 plate or synthesized quartz plate and their spectra measured. In the wavelength region 190 to about 400 nm, conventional spectrophotometers are adopted for the measurement. The extinction curve of the film of E. coli is similar to the observed IS curve. For the wave-range lambda of between 100 and 400 nm, a vacuum UV spectrometer is adopted to avoid absorptions due to O2 in the atmosphere. The extinction spectra by this method are in agreement with the result obtained by the conventional method where comparison is possible. The extinction curves of E. coli and yeast are such that they increase towards the short wavelength and exhibit a peak at lambda = 190 nm, which is different from the well-known IS peak at lambda = 220 nm. It remains to be seen whether interstellar low temperatures (10 to about 40 K) can shift the peak position in the extinction curve of biochemical materials.
Inagaki Takahiro
Takai T.
Wada Keiichi
Yabushita Shin
Young Donovan
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