منابع مشابه
Dust emissivity variations in the Milky Way
Aims. Dust properties appear to vary according to the environment in which the dust evolves. Previous observational indications of these variations in the far-infrared (FIR) and submillimeter (submm) spectral range are scarce and limited to specific regions of the sky. To determine whether these results can be generalised to larger scales, we study the evolution in dust emissivities from the FI...
متن کاملDust Emissivity in the Far - Infrared
We have derived the dust emissivity in the FarInfrared (FIR) using data available in the literature. We use two wavelength dependences derived from spectra of Galactic FIR emission (Reach et al. 1995). A value for the emissivity, normalised to the extinction efficiency in the V band, has been retrieved from maps of Galactic FIR emission, dust temperature and extinction (Schlegel et al. 1998). O...
متن کاملCosmic Dust, Refraction and Emissivity
Cosmic dust is pervasive within our galaxy and it is reasonable to suspect it is dispersed in various ways throughout the universe. Cosmic dust has emissivity when exposed to electromagnetic energy sources. The emissivity of cosmic dust contributes to cosmic radio noise and concentrations of it alters electromagnetic waves by refraction. Cosmic dust is concentrated in our Sun’s heliosphere and ...
متن کاملThe emissivity of dust grains in spiral galaxies
We use the radiation transfer simulation of Xilouris et al. (1999) to constrain the quantity of dust in three nearby spiral galaxies (NGC 4013, NGC 5907 and NGC 4565). The predicted visual optical depth from the model is compared with the thermal continuum radiation detected from NGC 4013 and NGC 5907 at 850 μm and from NGC 4565 at 1.2 mm. The former is based on SCUBA images of NGC 4013 and NGC...
متن کاملDust emissivity in the Submm / Mm SCUBA and SIMBA observations of Barnard 68
We have observed the dark cloud Barnard 68 with SCUBA at 850 µm and with SIMBA at 1.2 mm. The submillimetre and millimetre dust emission correlate well with the extinction map of Alves, Lada, & Lada (2001). The A V /850 µm correlation is clearly not linear and suggests lower temperatures for the dust in the inner core of the cloud. Assuming a model for the temperature gradient, we derive the cl...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20030078