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Can Dust Explain Variations in the D/H Ratio?
B. T. Draine
The D/H ratio in interstellar gas varies on scales of a few hundred pc in the local Milky Way, with D/H values ranging from ~7 ppm to ~22 ppm. The reduction in D/H relative to the…
User Guide for the Discrete Dipole Approximation Code DDSCAT 6.1
Bruce T. Draine, Piotr J. Flatau
DDSCAT 6.1 is a software package which applies the discrete dipole approximation (DDA) to calculate scattering and absorption of electromagnetic waves by targets with arbitrary geo…
Dust Dynamics in Compressible MHD Turbulence
Huirong Yan, A. Lazarian, B. T. Draine
We calculate the relative grain-grain motions arising from interstellar magnetohydrodynamic (MHD) turbulence. The MHD turbulence includes both fluid motions and magnetic fluctuatio…
Direct Extragalactic Distance Determination Using X-Ray Scattering
B. T. Draine, Nicholas A. Bond
We examine the feasibility of using dust-scattered X-rays for direct determination of distances to nearby galaxies with bright background AGNs, QSOs, or GRBs. We show how the Chand…
IRAC Observations of M81
S. P. Willner, M. L. N. Ashby, P. Barmby +15
IRAC images of M81 show three distinct morphological constituents: a smooth distribution of evolved stars with bulge, disk, and spiral arm components; a clumpy distribution of dust…
Mid-Infrared IRS Spectroscopy of NGC 7331: A First Look at the SINGS Legacy
J. D. T. Smith, D. A. Dale, L. Armus +22
The nearby spiral galaxy NGC 7331 was spectrally mapped from 5-38um using all modules of Spitzer's IRS spectrograph. A strong new dust emission feature, presumed due to PAHs, was d…