Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512..224a&link_type=abstract
The Astrophysical Journal, Volume 512, Issue 1, pp. 224-229.
Astronomy and Astrophysics
Astronomy
46
Ism: Dust, Extinction, Galaxy: Center, Infrared: Ism: Lines And Bands, Ism: Magnetic Fields, Polarization
Scientific paper
Spectropolarimetry of the 3.4 μm aliphatic C-H stretch feature, generally attributed to carbonaceous dust in the diffuse interstellar medium, has been carried out in the line of sight from the Galactic center source Sagittarius A IRS 7. The feature is unpolarized (Deltap/Deltatau<0.2): the upper limit for polarization is well below that expected on the basis of a model in which the carrier molecules are associated with the aligned silicate component of interstellar dust, for example, as an organic or carbonaceous mantle on a silicate core. The simplest explanation is that the 3.4 μm carrier resides in a population of small, nonpolarizing carbonaceous grains, physically separate from the silicates and sharing many characteristics with the carriers of the 217.5 nm extinction bump.
Adamson Andrew J.
Aitken David K.
Chrysostomou Antonio
Hough James H.
Roche Patrick F.
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