We present observations at 3.6, 4.5, 5.8, 8, 24, 70, and 160 m of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The point-source–subtracted images at 8 and 24 m display a complex and fragmented infrared emission coming from both very small dust particles and larger grains. The extended dust emission is spatially concentrated in three main emission re...

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...

This study aims to compare, on the one hand, the geographical distribution of the desert dust source areas, their contribution to quantities emitted into the atmosphere, the trajectories and the quantities deposited, with on the other hand the areas of research interest focused on the desert dust impacts on air quality and/or human health. Based on a systematic review of the literature using th...

We introduce a dust model for cosmological simulations implemented in the movingmesh code arepo and present a suite of cosmological hydrodynamical zoom-in simulations to study dust formation within galactic haloes. Our model accounts for the stellar production of dust, accretion of gas-phase metals onto existing grains, destruction of dust through local supernova activity, and dust driven by wi...

The COMPLETE Survey of Star-Forming regions offers an unusually comprehensive and diverse set of measurements of the distribution and temperature of dust and gas in molecular clouds, and in this paper we use those data to find new calibrations of the “X-factor” and the 13CO abundance within Perseus. To carry out our analysis, we: 1) apply the NICER (Near-Infrared Color Excess Method Revisited) ...

Title of Dissertation: Dust Structure and Composition Within Molecular Clouds and Cores Nicholas Lane Chapman, Doctor of Philosophy, 2007 Dissertation directed by: Professor Lee G. Mundy Department of Astronomy We observed three molecular clouds and four isolated cores at wavelengths from 3.6− 24 μm. The clouds we observed were Ophiuchus, Perseus, and Serpens and the cores were L204C-2, L1152, ...

Context. The Spitzer GLIMPSE and MIPSGAL surveys have revealed a wealth of details about the Galactic plane in the infrared (IR) with orders of magnitude higher sensitivity, higher resolution, and wider coverage than previous IR observations. The structure of the interstellar medium (ISM) is tightly connected to the countless star-forming regions. We use these surveys to study the energetics an...

[1] The global chemical transport model GEOS‐Chem, implemented with a dust‐iron dissolution scheme, was used to analyze the magnitude and spatial distribution of mineral dust and soluble‐iron (sol‐Fe) deposition to the South Atlantic Ocean (SAO). The comparison of model results with remotely sensed data shows that GEOS‐Chem can capture dust source regions in Patagonia and characterize the tempo...