Time variable 21 CM lines and the stray radiation problem

Details Time variable 21 CM lines and the stray radiation problem Time variable 21 CM lines and the stray radiation problem

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..275k&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 3, Feb. 1980, p. 275-286.

Astronomy and Astrophysics

Astronomy

118

Galactic Radio Waves, Hydrogen, Neutral Gases, Periodic Variations, Radio Telescopes, Sidelobes, Antenna Radiation Patterns, Galactic Structure, Radiation Distribution, Radio Astronomy

Scientific paper

Time variable 21 cm lines are observed with the 100 m telescope at high galactic latitudes. It is demonstrated that the variability can be accounted for by stray radiation arising from the far sidelobes of the telescope. The total amount of stray radiation increases from about 15% of the observed profile area in the galactic plane to typically 50% or more in high galactic latitudes. A correction procedure is developed which is based on a convolution of the 21 cm line brightness distribution of the total visible sky with the antenna pattern of the 100 m telescope. The accuracy of the corrected profiles is better than 1.5 K in the galactic plane or 0.2 K in high galactic latitudes. Three examples are briefly discussed which demonstrate the importance of a stray radiation correction for an astrophysical interpretation of high latitude H I data.

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