On the missing 2175 Angstroem-bump in the Calzetti extinction curve

Details On the missing 2175 Angstroem-bump in the Calzetti extinction curve On the missing 2175 Angstroem-bump in the Calzetti extinction curve

2011-08-09

arxiv.org/abs/1108.1971v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 6 figures accepted for publication in A&A, section 6

Scientific paper

The aim of the paper is to give a physical explanation of the absence of the feature in the Calzetti extinction curve. We analyze the dust attenuation of a homogeneous source seen through a distant inhomogeneous distant screen. The inhomogeneities are described through an idealized isothermal turbulent medium where the probability distribution function (PDF) of the column density is log-normal. In addition it is assumed that below a certain critical column density the carriers of the extinction bump at 2175 Angstroem are being destroyed by the ambient UV radiation field. Turbulence is found to be a natural explanation not only of the flatter curvature of the Calzetti extinction curve but also of the missing bump provided the critical column density is N_H >= 10^21 cm^-2. The density contrast needed to explain both characteristics is well consistent with the Mach number of the cold neutral medium of our own Galaxy which suggests a density contrast sigma_(rho/) 6.

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