Extreme scattering events and Galactic dark matter

Details Extreme scattering events and Galactic dark matter Extreme scattering events and Galactic dark matter

1998-02-10

arxiv.org/abs/astro-ph/9802111v2

Astrophys.J. 498 (1998) L125-L128

Astronomy and Astrophysics

Astrophysics

5 pp incl 3 figs, LaTeX, uses aas2pp4.sty. Minor revisions. ApJ Letters in press

Scientific paper

10.1086/311332

Extreme Scattering Events (ESEs) are attributed to radio-wave refraction by a cloud of free-electrons crossing the line-of-sight. We present a new model in which these electrons form the photo-ionized 'skin' of an underlying cool, self-gravitating cloud in the Galactic halo. In this way we avoid the severe over-pressure problem which afflicts other models. The UV flux in the Galactic halo naturally generates electron densities of the right order. We demonstrate, for the first time, a good reproduction of the prototypical ESE in the quasar 0954+658. The neutral clouds are a few AU in radius and have masses less than about 10^{-3} solar. The observed rate of ESEs implies that a large fraction of the mass of the Galaxy is in this form.

Affiliated with

Also associated with

No associations

Rating

Extreme scattering events and Galactic dark matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Extreme scattering events and Galactic dark matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extreme scattering events and Galactic dark matter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-489234