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• W204479603 abstract "The radio emission from normal galaxies is weak and requires the largest telescopes to observe them. In principal the best case to study normal galaxies is our own one. However, our unfavourable location within the Galaxy makes it necessary to conduct large-scale surveys at dierent frequencies in order to derive physical properties of the Galaxy. For a long time the 408MHz all-sky survey and the 1420MHz survey of the northern sky have been the most reliable surveys to perform these studies. In the last years the 1420MHz survey has been extended to an all-sky survey. Also at 22, 45 and 2625MHz large portions of the Galaxy were recently mapped, so that there is an unprecedented database for Galactic studies available today. However, some care must be taken when comparing these surveys as they come from rather dierent telescopes and use dierent observing techniques. frequencies have been conducted in order to study our own Galaxy. For example the parameters of the thin and the thick disk or halo were modelled. With these global parameters of the Galaxy, comparisons with those from other galaxies are possible. The spectrum of the radio emission can be computed and a separation of the thermal and non-thermal emission can be made. Surveys provide an overall view to large local features extending up to 100 - like the prominent North Polar Spur (NPS). Other large supernova remnants, HII region complexes, loops and spurs are also outstanding features in the survey maps and can be studied in some detail. Beyond astronomical applications surveys are important in other fields. The Galac- tic background is a major source of noise at low frequencies and sets the limit for receiver sensitivities other than technology, which constrains the sensitivity in the high frequency range. It was recently realised that the 1.4GHz surveys are of special interest for coming 1.4GHz satellite measurements of the ocean salinity or soil moisture, because these radiome- ters pick up Galactic emission by their sidelobes and ground reflections (Kerr et al. 2002 and references therein). Furthermore surveys give a comprehensive overview of the Galactic foreground emission, which has to be subtracted from cosmic microwave background mea- surements before studies of its fine structure for cosmological information. Finally absolutely calibrated sky surveys are needed to add missing large-scale components to interferometric data. Also relative measurements of limited fields made with large single dishes like the Eelsberg telescope gain from adding correct large-scale structures." @default.
• W204479603 created "2016-06-24" @default.
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• W204479603 date "2003-02-01" @default.
• W204479603 modified "2023-09-23" @default.
• W204479603 title "Large Scale Surveys of the Galaxy" @default.
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