# Astrophysics of Dust in Cold Clouds

**Authors:** B. T. Draine  
**arXiv:** [astro-ph/0304488](https://arxiv.org/abs/astro-ph/0304488)  
**Date:** 2003-04-28  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/astro-ph--0304488v1/

## Key points

- The astrophysics of dust in interstellar clouds is the main focus of this comprehensive review
- Lecture 1: Summary of observational evidence related to interstellar dust, including extinction, scattering, polarization, spectroscopy, and emissions
- Lecture 2: Optics of interstellar dust grains, covering dielectric functions, calculational techniques, Rayleigh limit, Kramers-Kronig relations, microwave emission mechanisms, and X-ray scattering
- Lecture 3: Detailed exploration of heating mechanisms for interstellar dust, including single-photon heating and resulting IR emission spectrum
- Lecture 4: Discussion on charging mechanisms for dust grains, including collisional charging and photoelectric emission processes

## Summary

The astrophysics of dust in interstellar clouds is the focus of this comprehensive review, consisting of nine lectures. The first lecture provides a summary of observational evidence related to interstellar dust, including broadband extinction, scattering and polarization of starlight, spectroscopy of dust, infrared (IR) and far-infrared (FIR) emission, as well as depletions of grain-forming elements. The second lecture delves into the optics of interstellar dust grains, covering topics such as dielectric functions for both nonconducting and conducting materials, calculational techniques, formulae applicable in the Rayleigh limit, Kramers-Kronig relations, microwave emission mechanisms, and X-ray scattering. Moving on to lecture three, the heating of interstellar dust is explored in detail. This includes an examination of single-photon heating and its resulting IR emission spectrum. Lecture four focuses on charging mechanisms for dust grains, discussing collisional charging and photoelectric emission processes that lead to charge distribution functions.