On Ultrasmall Silicate Grains in the Diffuse Interstellar Medium | Zendy

Aigen Li | Zendy; B. T. Draine | Zendy

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On Ultrasmall Silicate Grains in the Diffuse Interstellar Medium

Author(s) -

Aigen Li,

B. T. Draine

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/319640

Subject(s) - silicate , interstellar medium , extinction (optical mineralogy) , amorphous solid , astrophysics , physics , cosmic dust , absorption (acoustics) , ultraviolet , silicate minerals , astrochemistry , astronomy , chemistry , optics , crystallography , galaxy

The abundance of both amorphous and crystalline silicates in very smallgrains is limited by the fact that the 10 micron silicate emission feature isnot detected in the diffuse ISM. On the basis of the observed IR emissionspectrum for the diffuse ISM, the observed ultraviolet extinction curve, andthe 10 micron silicate absorption profile, we obtain upper limits on theabundances of ultrasmall (a < 15 Angstrom) amorphous and crystalline silicategrains. Contrary to previous work, as much as ~20% of interstellar Si could be in a <15 Angstrom silicate grains without violating observational constraints. Notmore than ~5% of the Si can be in crystalline silicates (of any size).Comment: Submitted to ApJ Letters, 11 pages, 4 figures, Late

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