SIMBAD references

1999ApJ...512..224A - Astrophys. J., 512, 224-229 (1999/February-2)

Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium.

ADAMSON A.J., WHITTET D.C.B., CHRYSOSTOMOU A., HOUGH J.H., AITKEN D.K., WRIGHT G.S. and ROCHE P.F.

Abstract (from CDS):

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 (Δp/Δτ<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.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - Galaxy: Center - Infrared: ISM: Lines and Bands - ISM: Magnetic Fields - Polarization

Simbad objects: 6

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