Proposal Identi cation No.: A1066 Date Received: 1997-Dec- 5 16:47:28 Technical Page Proposal Type: Regular General Category : Astronomy Sub- Category : Spectroscopy Observation Category : Extragalactic Total Time Requested: 18 Hours Proposal Title: An HI-Optical Search for Dwarf Members of a Galaxy Group and for Low Surface Brightness Galaxies ABSTRACT: An approach to detecting low surface brightness late-type ... Maybe Part of the observing run. ...

... 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. ...