Published April 16, 1987 | Version v1
Journal article Metadata-only

Extreme scattering events caused by compact structures in the interstellar medium

Creators

  • 1. Naval Research Lab., Washington, DC (USA). E.O. Hulburt Center for Space Research
  • 2. Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Physics
  • 3. Mullard Radio Astronomy Observatory, Cambridge (UK). Cavendish Lab.

Description

Daily flux density measurements of 36 extragalactic radio sources over a seven year period reveal several unusual minima in the light curves that do not follow typical source variations. The observations were performed using the Green Bank interferometer operating at 2.7 and 8.1 GHz. The most significant departure from typical source variability occurred at both frequencies in the quasar 0954+658 between 1980.95 and 1981.3. The most satisfactory explanation appears to involve refractive focusing by small-scale inhomogeneities in an ionized structure in the interstellar medium. (author)

Additional details

Publishing Information

Journal Title
Nature (London)
Journal Volume
326
Journal Issue
6114
Series
Nature (London).
Journal Page Range
675-678
ISSN
0028-0836
CODEN
NATUA

INIS

Country of Publication
United Kingdom
Country of Input or Organization
United Kingdom
INIS RN
18075173
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
COSMIC RADIO SOURCES; EXPERIMENTAL DATA; FLUX DENSITY; GHZ RANGE 01-100; INTERSTELLAR SPACE; QUASARS; RADIATION FLUX; RADIOWAVE RADIATION; SCATTERING; TIME DEPENDENCE; VARIATIONS
Descriptors DEC
DATA; ELECTROMAGNETIC RADIATION; FREQUENCY RANGE; GHZ RANGE; INFORMATION; NUMERICAL DATA; RADIATIONS; SPACE