Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0505s&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #05.05; Bulletin of the American Astronomical Society, Vol. 31, p.1373
Astronomy and Astrophysics
Astronomy
Scientific paper
Using multi-frequency VLBA and MERLIN observations of 32 compact radio sources within 30o <= l <= 75o, |b| <= 3o, we test suggestions that the distribution of Galactic electron-density fluctuations contains a spiral component. We derive Scattering Measure (SM = ∫ 0s CN2(s') ds') values and limits from source sizes obtained via λ 18-cm images. Lines of sight in this longitude range pass from the Sagittarius Arm, through an interarm region, into the Orion Arm, and large changes in the distribution of SM are expected if spiral structure is present in the electron-density fluctuations. Results indicate such effects. These measurements further constrain the parameters in the CN2 distribution model by Ghosh & Rao (1992). New best-fit parameters for this model are presented.
Ghosh Tamal
Junor William
Manoharan Periasamy K.
Salgado Jose F.
Salter Christopher J.
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