... A2233 Date Received: 2006-May-31 23:23:18 Technical Page Proposal Type: General Category : Sub- Category : Observation Category : Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Short Astronomy Spectroscopy Galactic 3 Hours 90 minutes Neutral Hydrogen Mapping of the Planetary Nebula M27 We propose to acquire a spatial- velocity data cube of the neutral hydrogen distribution in direction of the the planetary nebula ...

... 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. ...