... A1703 Date Received: 2002-May-23 10:26:52 Technical Page Proposal Type: Regular General Category: Astronomy Sub-Category: Spectroscopy Observation Category: Extragalactic Total Time Requested: 78 Hours Proposal Title: 21 cm of Virgo cluster dwarf spheroidal galaxies. ... We nd large numbers of dwarf galaxies consistent with a steep faint end slope of the Luminosity Function and have identi ed a new population (144 galaxies in this area) of relatively large dwarf LSB galaxies in the cluster. ...

... 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. ...