Observations of the southern sky at five frequencies in the range 2-20 MHz

Details Observations of the southern sky at five frequencies in the range 2-20 MHz Observations of the southern sky at five frequencies in the range 2-20 MHz

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179...21c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 179, Apr. 1977, p. 21-29. Research supported by the Australian Research

Astronomy and Astrophysics

Astronomy

3

Astronomical Maps, Brightness Temperature, Radio Astronomy, Radio Telescopes, Background Radiation, Bandwidth, Galactic Radiation, Galactic Structure, H Ii Regions, Radio Spectra

Scientific paper

Results are presented for a survey of the southern sky conducted at frequencies of 3.7, 5.6, 8.3, 13.0, and 16.5 MHz with a low-frequency array having a resolution of approximately 2.5 deg of arc at 10 MHz. Contours of brightness temperature at each frequency are mapped for the area between 30 and 320 deg galactic longitude and -25 and 22 deg galactic latitude. The most pronounced features of the 13.0- and 16.4-MHz maps are shown to be discrete regions of absorption due to nearby H II regions. At lower frequencies, two main regions of depressed brightness along the galactic plane are observed instead of the discrete regions of absorption.

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