Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..239d&link_type=abstract
Nature (ISSN 0028-0836), vol. 320, March 20, 1986, p. 239-242.
Astronomy and Astrophysics
Astronomy
21
Bl Lacertae Objects, Extragalactic Radio Sources, Flux Quantization, Periodic Variations, Radio Astronomy, Very Large Array (Vla), Amplitudes, Brightness Temperature, Harmonic Analysis, Instrument Errors, Temporal Distribution
Scientific paper
The extragalactic BL Lacertae object OJ 287 was observed with the Very Large Array at 5, 15, and 22 GHz several times in early 1983. The 5 GHz data show OJ 287 to have decreased in flux by about 1.8 percent in an irregular way over a span of about 7 hr, and to have fluctuated by about 0.5 percent on a time scale of about 15 min. Brightness temperatures derived from causality constraints range between 10 to the 16th and 10 to the 20th K. Fourier spectra of the time series were analyzed using a novel one-dimensional complex CLEAN algorithm to remove the effects of the data sampling. At 5 GHz, there was no harmonic component to the intensity of OJ 287 which exceeded 0.1 percent of the mean for any period between 80 and 5000 s. The limits at 15 and 22 GHz were 2 percent and 0.8 percent, respectively.
Dreher John W.
Leh'ar Joseph
Roberts David H.
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