X-Ray Scattering by Nonspherical Grains. I. Oblate Spheroids

Details X-Ray Scattering by Nonspherical Grains. I. Oblate Spheroids X-Ray Scattering by Nonspherical Grains. I. Oblate Spheroids

2006-08-01

arxiv.org/abs/astro-ph/0608037v1

Astrophys.J.652:1318-1330,2006

Astronomy and Astrophysics

Astrophysics

To appear in The Astrophysical Journal

Scientific paper

10.1086/508133

We calculate the scattering of X-rays by interstellar dust, for a dust model that reproduces the observed wavelength-dependent extinction and polarization of starlight. On interstellar sightlines that produce appreciable starlight polarization, we predict that the dust-scattered X-ray halo around point sources will have measurable azimuthal asymmetry due to scattering by partially-aligned nonspherical grains. We calculate the expected halo asymmetry. X-ray halo asymmetry provides a new test of interstellar dust models.

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