The Secular Decrease of the Crab Nebula at 927 and 151.5 MHz

Details The Secular Decrease of the Crab Nebula at 927 and 151.5 MHz The Secular Decrease of the Crab Nebula at 927 and 151.5 MHz

2005-02-02

arxiv.org/abs/astro-ph/0502033v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, poster report at Supernovae as Cosmological Lighthouses, 16-19 June 2004, Padua, Italy

Scientific paper

Long-term measurements have been carried out of the Crab Nebula radio emission flux density relative to Orion A at 927 MHz and relative to Cygnus A and Virgo A at 151.5 MHz. As a result the mean rates have been found of the secular change of the Crab Nebula radio emission flux density: $d_m (927\hbox{MHz})=-(0.18\pm0.10)$% year$^{-1}$ (over the period 1977--2000), $d_m (151.5\hbox{MHz})=- (0.32\pm0.08)$% year$^{-1}$ (over the period 1980--2003).

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