An Astronomical 2175 Å Feature in Interplanetary Dust Particles-Reference-Cited by-同舟云学术

An Astronomical 2175 Å Feature in Interplanetary Dust Particles

Published:2005-01-14 Issue:5707 Volume:307 Page:244-247
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Bradley John¹²³⁴⁵,Dai Zu Rong¹²³⁴⁵,Erni Rolf¹²³⁴⁵,Browning Nigel¹²³⁴⁵,Graham Giles¹²³⁴⁵,Weber Peter¹²³⁴⁵,Smith Julie¹²³⁴⁵,Hutcheon Ian¹²³⁴⁵,Ishii Hope¹²³⁴⁵,Bajt Sasa¹²³⁴⁵,Floss Christine¹²³⁴⁵,Stadermann Frank¹²³⁴⁵,Sandford Scott¹²³⁴⁵

Affiliation:

1. Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

2. Department of Chemical Engineering, University of California at Davis, CA 95616, USA.

3. National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

4. Laboratory for Space Sciences, Washington University, St. Louis, MO 63130, USA.

5. Astrophysics Branch, NASA–Ames Research Center, Moffett Field, CA 94035, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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