Computer Science – Sound
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..467s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, Feb. 1987, p. 467-473. CNR-supported research.
Computer Science
Sound
5
Chemical Composition, Emission Spectra, Far Infrared Radiation, Near Infrared Radiation, Temperature Distribution, Zodiacal Dust, Balloon Sounding, Density Distribution, Radial Distribution, Sky Surveys (Astronomy), Spectral Resolution
Scientific paper
The authors have results from an infrared sky survey experiment performed during a balloon flight on 30 July 1984. The experiment explored five wavelength bands centered at 11, 19, 50, 108, and 225 μm with spectral resolutions (Δλ/λ) 0.07, 0.02, 0.3, 0.4, and 0.3, respectively. The results show that the dust emission, as a function of the ecliptic longitude, follows the exponential law e|-mλ-λ&sun;| with m = 0.025 (+0.027, -0.013) at 20 μm, in the range 10° < |λ-λ_sun;| < 90°. The decrease of the dust density (n) with increasing heliocentric distance is slower than r-1.3. The actual trend of n, however, depends critically on the radial variation of the temperature which, in turn, depends on the chemical composition of the grains. The spectrum of the dust emission confirms previous observations by IRAS and extends them towards larger wavelengths. Even though the data do not allow an unambiguous determination of the relative abundance of the different species of grains, they may be fitted by an appropriate mixture of graphite and silicates.
Andreani Paola
Dall'Oglio Giorgio
deBernardis P.
Masi Silvia
Melchiorri Bianca
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