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Molecular Line Surveys with Arecibo Minchin et al. ... So far, the Arp 220 Spectral Survey has made the first detection of the pre-biotic molecule Methanamine (CH2 NH) outside of the Local Group, has seen three cm-wavelength transitions of HCN that had not previously been observed, has detected three transitions of excited OH that were not previously known in Arp 220 , has detected an absorption feature of either 18 OH or Formic Acid (HCOOH), and has seen a possible ...
[ Текст ]  Ссылки -- 61.6 Кб -- 24.09.2007
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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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