Constraints on the secular decrease in the flux density of Cas A at 13.5, 15.5 and 16.5 GHz

被引:12
作者
O'Sullivan, C [1 ]
Green, DA
机构
[1] Natl Univ Ireland Univ Coll Galway, Dept Phys, Galway, Ireland
[2] Univ Cambridge, Cavendish Lab, Mullard Radio Astron Observ, Cambridge CB3 0HE, England
关键词
ISM : individual : Cas A; radio continuum; general;
D O I
10.1046/j.1365-8711.1999.02259.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Observations of the flux density ratio of Cas A to Cyg A at 13.5, 15.5 and 16.5 GHz made in 1994 and 1995 with the Cosmic Anisotropy Telescope are presented. These observations are compared with the predictions of Baars et al. and lower frequency observations, in order to understand better the frequency dependence of the secular decrease in the flux density of Cas A. When compared with measurements at other frequencies, these observations imply that there is a frequency dependence to the secular decrease in the flux density of Cas A, but that it is not as strongly frequency dependent as was thought by Baars et al. when they constructed their absolute flux density spectrum of Cas A.
引用
收藏
页码:575 / 578
页数:4
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