An Astronomical 2175 Å Feature in Interplanetary Dust Particles

Details An Astronomical 2175 Å Feature in Interplanetary Dust Particles An Astronomical 2175 Å Feature in Interplanetary Dust Particles

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sci...307..244b&link_type=abstract

Science, Volume 307, Issue 5707, pp. 244-247 (2005).

Astronomy and Astrophysics

Astronomy

28

Scientific paper

The 2175 angstrom extinction feature is the strongest (visible-ultraviolet) spectral signature of dust in the interstellar medium. Forty years after its discovery, the origin of the feature and the nature of the carrier(s) remain controversial. Using a transmission electron microscope, we detected a 5.7-electron volt (2175 angstrom) feature in interstellar grains embedded within interplanetary dust particles (IDPs). The carriers are organic carbon and amorphous silicates that are abundant in IDPs and in the interstellar medium. These multiple carriers may explain the enigmatic invariant central wavelength and variable bandwidth of the astronomical 2175 angstrom feature.

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