2016A&A...588A..43J -
Astronomy and Astrophysics, volume 588A43-43 (2016/4-1)
Mantle formation, coagulation, and the origin of cloud/core shine.
JONES A.P., KOHLER M., YSARD N., DARTOIS E., GODARD M. and GAVILAN L.
Abstract (from CDS):
Context. The observed cloudshine and coreshine (C-shine) have been explained in terms of grain growth leading to enhanced scattering from clouds in the J, H, and K photometric bands and the Spitzer IRAC 3.6 and 4.5µm bands.
Aims. Using our global dust-modelling approach THEMIS (The Heterogeneous dust Evolution Model at the IaS), we explore the effects of dust evolution in dense clouds, through aliphatic-rich carbonaceous mantle formation and grain-grain coagulation.
Methods. We model the effects of wide band gap a-C:H mantle formation and the low-level aggregation of diffuse interstellar medium dust in the moderately-extinguished outer regions of molecular clouds.
Results. The formation of wide band gap a-C:H mantles on amorphous silicate and amorphous carbon (a-C) grains leads to a decrease in their absorption cross-sections but no change in their scattering cross-sections at near-infrared wavelengths, resulting in higher albedos.
Conclusions. The evolution of dust, with increasing density and extinction in the diffuse-to-dense molecular cloud transition, through mantle formation and grain aggregation, appears to be a likely explanation for the observed C-shine.
Abstract Copyright:
© ESO, 2016
Journal keyword(s):
dust, extinction - ISM: general - evolution
Simbad objects:
7
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