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Title:
Search for short-term variability in nonthermal radio sources
Authors:
Abraham, Z.; Kaufmann, P.; Botti, L. C. L.
Affiliation:
AA(Instituto de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo, Brazil), AB(Instituto de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo, Brazil), AC(Instituto de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo, Brazil)
Publication:
Astronomical Journal, vol. 87, Mar. 1982, p. 532-536. Research supported by the Financiadora de Estudos e Projetos. (AJ Homepage)
Publication Date:
03/1982
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
MILLIMETER WAVES, NONTHERMAL RADIATION, RADIO SOURCES (ASTRONOMY), VARIABILITY, GALACTIC NUCLEI, JUPITER (PLANET), MILKY WAY GALAXY, QUASARS, RADIANT FLUX DENSITY, RADIO GALAXIES
Comment:
A&AA ID. AAA031.141.091
DOI:
10.1086/113126
Bibliographic Code:
1982AJ.....87..532A

Abstract

A long series of 22-GHz daily observations (24 days) of the radio sources 3C 273, Cen A, Sgr A, and OV -236 was carried out in July 1980. None of these sources presented any short-term variability larger than the accuracy of the measurements (about 10 percent). Cen A presented the highest flux level in relation to the past seven years, and it decreased consistently during the period of observation at a rate of 0.2 plus or minus 0.02 Jy/day. The flux density of OV -236 increased in the same period at a rate of 0.1 plus or minus 0.02 Jy/day.

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