Flicker of extragalactic radio sources at two epochs

Details Flicker of extragalactic radio sources at two epochs Flicker of extragalactic radio sources at two epochs

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349...97s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. 97-106.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Extragalactic Radio Sources, Brightness Distribution, Interstellar Matter

Scientific paper

The flicker of compact extragalactic sources on day-like time scales is investigated. At 1410 MHz the flat-spectrum sources show larger intensity variations than do the steep-spectrum sources. At 820 MHz measurement noise dominates the source variations, so that observations yield an upper limit to the flicker amplitude at this frequency. The flicker amplitude appears to be weakly dependent upon observing wavelength, possibly increasing with increasing wavelength. No dependence of the intensity or time scale of flicker on galactic coordinates is apparent in this data set, but the number of flat spectrum sources observed may be too small to show any such effects. Evidence is presented that flicker is approximately stable in its characteristics over time scales at least as large as 2 yr.

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