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Title:
Secular decrease of the radio flux density of Cassiopeia A determined from long-term observations. Observations at 38, 81.5, and 151.5 MHz
Authors:
Vinyaĭkin, E. N.
Publication:
Astronomy Reports, Volume 50, Issue 2, p.143-151 (ARep Homepage)
Publication Date:
02/2006
Origin:
SPRINGER
DOI:
10.1134/S1063772906020077
Bibliographic Code:
2006ARep...50..143V

Abstract

Long-term measurements of the radio flux density of the young supernova remnant Cassiopeia A relative to the radio galaxy Cygnus A have been carried out at 38 MHz (1987 2004) and 151.5 MHz (1980 2004). Using other data from the literature, we find a secular decrease of the radio flux density of Cassiopeia A at the rates d(38 MHz) = -0.79 ± 0.14% yr-1 (for 1956 2004) and d(151.5 MHz) = -0.83 ± 0.04% yr-1 (for 1966 2004). Based on measurements made in 1997 and 1998 and data from the literature, this secular decrease at 81.5 MHz is d(81.5 MHz) = -0.86 ± 0.14% yr-1 (for 1966 1998). Absolute flux densities of Cassiopeia A at 38 and 151.5 MHz for epoch 2005.5 are calculated based on the relative flux density of Cassiopeia A and the spectrum of Cyg A, which is approximated using an empirical formula at meter and decameter wavelengths.
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