Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264l..13e&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 264, Jan. 1, 1983, p. L13-L17.
Astronomy and Astrophysics
Astronomy
17
Nebulae, Radio Sources (Astronomy), Supernova Remnants, Extragalactic Radio Sources, Pulsars, Radio Spectra, Scintillation
Scientific paper
The radio source 4C 21.53 lies on the galactic equator at l = 58°. Interplanetary scintillation observations imply that it contains a component ≤1arcsec in size. This Letter shows that 4C 21.53 consists of at least three components. Component 4C 21.53E is a small-diameter, extragalactic double radio source which becomes self-absorbed below 50 MHz. Component 4C 21.53W contains an extended component at 1480 MHz with a brightness distribution similar to that of the Crab Nebula. Low-frequency observations from Clark Lake Radio Observatory show that 4C 21.53W also contains a component with a very steep spectrum. This component must be the compact scintillator, and it is either a strong, highly dispersed pulsar or a most unusual extragalactic object.
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