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2008MNRAS.388.1775H - Mon. Not. R. Astron. Soc., 388, 1775-1786 (2008/August-3)
Radio source calibration for the Very Small Array and other cosmic microwave background instruments at around 30 GHz.
HAFEZ Y.A., DAVIES R.D., DAVIS R.J., DICKINSON C., BATTISTELLI E.S., BLANCO F., CLEARY K., FRANZEN T., GENOVA-SANTOS R., GRAINGE K., HOBSON M.P., JONES M.E., LANCASTER K., LASENBY A.N., PADILLA-TORRES C.P., RUBINO-MARTIN J.A., REBOLO R., SAUNDERS R.D.E., SCOTT P.F., TAYLOR A.C., TITTERINGTON D., TUCCI M. and WATSON R.A.
Abstract (from CDS):
The sources for which a 1 per cent relative flux density calibration was achieved included Cas A, Cyg A, Tau A and NGC 7027 and the planets Venus, Jupiter and Saturn. A flux density, or brightness temperature in the case of the planets, was derived at 33 GHz relative to Jupiter which was adopted as the fundamental calibrator. A spectral index at ∼30 GHz is given for each.
Cas A, Tau A, NGC 7027 and Venus were examined for variability. Cas A was found to be decreasing at 0.394 ±0.019 per cent/yr over the period 2001 March to 2004 August. In the same period Tau A was decreasing at 0.22±0.07 per cent/yr. A survey of the published data showed that the planetary nebula NGC 7027 decreased at 0.16±0.04 per cent/yr over the period 1967-2003. Venus showed an insignificant (1.5±1.3 per cent) variation with Venusian illumination. The integrated polarization of Tau A at 33 GHz was found to be 7.8±0.6 per cent at position angle =148°±3°.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): methods: observational - techniques: interferometric - cosmic microwave background - cosmology: observations - radio continuum: ISM - radio continuum: Solar system
Simbad objects: 7
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