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Going Deeper with the Arecibo 1 to 10 GHz Spectral Scan of Arp 220 1. ... Molecular line searches at these frequencies are relatively confusion free, and can be successful in finding heavier molecules. ... We also discovered a H 2 CO 4954­MHz maser in IC 860. ... Technical Details As all radio lines detected by us in Arp 220 (molecular lines and RRLs) are at least 200 km s -1 wide, we intend to employ the WAPP spectrometer in ``8­board mode'' with 100­MHz bandwidth per board over the entire spectrum. ...
[ Текст ]  Ссылки -- 403.4 Кб -- 05.03.2012
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... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...
[ Текст ]  Ссылки -- 370.1 Кб -- 14.03.2003
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