Computer Science – Sound
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0602m&link_type=abstract
American Astronomical Society, AAS Meeting #212, #6.02; Bulletin of the American Astronomical Society, Vol. 40, p.195
Computer Science
Sound
Scientific paper
We present the FUV dust albedo and scattering function measurements from two sounding rocket flights of the SPINR instrument. SPINR (The Spectrograph for Photometric Imaging with Numeric Reconstruction) recorded both spectral and spatial information at far-ultraviolet wavelengths (912-1450 Å) from the Upper Scorpius region and Orion. These targets offer two very different, however complementary geometries in which to measure the reflective properties of interstellar dust - the albedo (a) and the scattering asymmetry parameter (g). The intensity of the scattered light in the Upper Scorpius region is very sensitive to the albedo of the dust grains, but is weakly coupled to the asymmetry parameter. This is because the stars in this region are deeply embedded in their host cloud and illuminate it from the inside. The opposite is true for Orion. Its stars lie in the foreground and externally illuminate the slab-like cloud. The amount of light reflected by a point on the slab back along the specific angle to the observer is strongly dependent on the asymmetry parameter, but is less sensitive to the albedo. These two geometries provide a simple way to disentangle the dust albedo and asymmetry parameter. The SPINR data from these two regions were divided into three bands (912-1010 Å, 1035-1190 Å, and 1235-1450 Å). The spatial information from the large (16 deg) field of view was used to separate the star light from the reflected light and these stellar and nebular flux measurements were used to constrain the DIRTY radiative transfer model to specific a and g values in the three bands. The following is a discussion of the results from this analysis. This work was supported in part by NASA grant NAG5-960.
Chakrabarti Sangeeta
Cook Theodore Andrea
Lewis Nikole K.
Mendillo Christopher
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