Proposal Identification No.: A2233 Date Received: 2006­May­31 23:23:18 Technical Page Proposal Type: Short General Category : Astronomy Sub­ Category : Spectroscopy Observation Category : Galactic Total Time Requested: 3 Hours Minimum Useful Time: 90 minutes Proposal Title: Neutral Hydrogen Mapping of the Planetary Nebula M27 ABSTRACT: We propose to acquire a spatial ­ velocity data cube of the neutral ...

... 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. ...