Brilliant pebbles: A method for detection of very large interstellar grains

Aristotle Socrates, Bruce T. Draine

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A photon of wavelength λ ∼ 1 μm interacting with a dust grain of radius ap 1 mm (a "pebble") undergoes scattering in the forward direction, largely within a small characteristic diffraction angle θs λ/ap 100″. Though millimeter-size dust grains contribute negligibly to the interstellar medium's visual extinction, the signal they produce in scattered light may be detectable, especially for variable sources. Observations of light scattered at small angles allow for the direct measurement of the large grain population; variable sources can also yield tomographic information of the interstellar medium's mass distribution. The ability to detect brilliant pebble halos requires a careful understanding of the instrument point-spread function.

Original languageEnglish (US)
Pages (from-to)L77-L81
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Dust
  • Extinction
  • Scattering


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