NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Interstellar scattering, the North Polar Spur, and a possible new class of compact galactic radio sourcesClaims for a galactic-latitude dependence of interstellar angular broadening based on interplanetary-scintillation (IPS) observations are investigated. Analysis of the statistics of the angular sizes in an IPS survey shows that there is no evidence for increased angular broadening in the galactic plane. A region of sky about 500 sq deg of arc in area is considered in which significant angular broadening is thought to exist. An association between this region and the nearby North Polar Spur is proposed on the basis of the former's extension off the galactic plane to high latitudes. An evaluation of two-frequency angular-broadening measurements suggests that the data used to support the conclusion about a galactic-latitude dependence are not statistically significant. A study of pulsar data and implications for the angular broadening expected in the interstellar medium for sources at galactic latitudes below + or - 10 deg indicates the possible existence of a previously unsuspected class of compact galactic nonthermal radio sources, designated 'scintars'.
Document ID
19790043673
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rickard, J. J.
(Iowa, University Iowa City, Iowa, United States)
Cronyn, W. M.
(Clark Lake Radio Observatory Borrego Springs, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
March 15, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
79A27686
Funding Number(s)
CONTRACT_GRANT: AF NPP-75-157
CONTRACT_GRANT: NSF ATM-76-82739
CONTRACT_GRANT: N00017-72-C-4401
CONTRACT_GRANT: NSF ATM-73-06559
CONTRACT_GRANT: NGL-16-001-002
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available