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Grains in galactic haloesResearchers considered the effect of extensive forces on dust grains subjected to the light and matter distribution of a spiral galaxy (Greenberg et al. (1987), Ferrini et al. (1987), Barsella et al (1988). Researchers showed that the combined force on a small particle located above the plane of a galactic disk may be either attractive or repulsive depending on a variety of parameters. They found, for example, that graphite grains from 20 nm to 250 nm radius are expelled from a typical galaxy, while silicates and other forms of dielectrics, after initial expulsion, may settle in potential minimum within the halo. They discuss only the statistical behavior of the forces for 17 galaxies whose luminosity and matter distribution in the disk, bulge and halo components are reasonably well known. The preliminary results of the study of the motion of a dust grain for NGC 3198 are given.
Document ID
19910005671
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ferrara, Andrea (Pisa Univ. (Italy).)
Barsella, Bruno (Pisa Univ. (Italy).)
Ferrini, F. (Pisa Univ. (Italy).)
Greenberg, J. Mayo (Leiden Univ. (Netherlands).)
Aiello, Santi (Florence Univ.)
Date Acquired
September 6, 2013
Publication Date
December 1, 1989
Publication Information
Publication: NASA, Ames Research Center, Interstellar Dust: Contributed Papers
Subject Category
Astrophysics
Accession Number
91N14984
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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