Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium
Astrophysical Journal 512:1 PART 1 (1999) 224-229
Abstract:
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, non-polarizing carbonaceous grains, physically separate from the silicates and sharing many characteristics with the carriers of the 217.5 nm extinction bump.A large-scale bulk flow of galaxy clusters
ASTROPHYSICAL JOURNAL 512:2 (1999) L79-L82
Completeness and confusion in the identification of Lyman-break galaxies
HY-REDSHIFT UNIVERSE: GALAXY FORMATION AND EVOLUTION AT HIGH REDSHIFT 193 (1999) 513-516
Galactic bulges from Hubble Space Telescope NICMOS observations:: ages and dust
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 310:3 (1999) 703-716
Integral field 3D spectroscopy: Techniques and prospects
ASTR SOC P 188 (1999) 303-313