Proposal Identification No.: A2043 Date Received: 2005­Jan­31 15:38:05 Technical Page Proposal Type: Short General Category: Astronomy Sub­Category: Spectroscopy Observation Category: Extragalactic Total Time Requested: 3 Hours Proposal Title: H I 21 cm Search for a Ly alpha Absorbing Galaxy ABSTRACT: We request observing time on the Arecibo Radio Telescope to look for the HI emission spectrum of a nearby lyman­alpha­dense galaxy discovered recently with the Hubble Space Telescope. ...

... 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. ...