... A2438 Date Received: 2008 -Sep-29 11:27:59 Technical Page Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Extragalactic 36 Hours 1 hours Centimeter HCN absorption lines toward local gas rich galaxies We propose to observe centimeter HCN l-type absorption lines (J=4 and J=6) toward seven local gas rich galaxies, to study temperature and column density of dense molecular gas in these galaxies. ...

... 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. ...