Journal article
Search for microarcsecond structure in low-frequency variable radio sources
The Astronomical journal, Vol.82, pp.785-790
10/1977
DOI: 10.1086/112126
Abstract
A search for interstellar scintillation (ISS) of low-frequency variable radio sources is reported. Observations of 28 confirmed or suspected low-frequency variables, 21 nonvariable sources, and two pulsars were made at 408 MHz. As expected, the pulsars showed ISS, but scintillation was not detected in any other source. A typical upper limit to the rms modulation due to ISS is 150 mJy, giving lower limits to the apparent angular diameter of about 10 to the -6th arcsec. The possibilities that a true point source is broadened to an apparent angular diameter greater than or roughly equal to 10 to the -6th arcsec by scattering local to the source or in a general intergalactic medium are discussed.
Details
- Title: Subtitle
- Search for microarcsecond structure in low-frequency variable radio sources
- Creators
- J. W Armstrong - National Radio Astronomy ObservatoryS. R Spangler - California Institute of TechnologyP. E Hardee - National Radio Astronomy Observatory
- Resource Type
- Journal article
- Publication Details
- The Astronomical journal, Vol.82, pp.785-790
- DOI
- 10.1086/112126
- ISSN
- 0004-6256
- eISSN
- 1538-3881
- Language
- English
- Date published
- 10/1977
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199685102771
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