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A mosaic of six HI line observations with the Australia Telescope CompactArray is used to search for intergalactic gas in the NGC 1808 group ofgalaxies. Within the field of view of about 1.4 deg x 1.2 deg, no emission fromintergalactic HI gas is detected, either in the form of tidal plumes or tails,intergalactic HI clouds, or as gas associated with tidal dwarf galaxies, with a5-sigma limiting sensitivity of about 3x10^{18} cm^{-2} (or 1.4x10^7 M_sun at adistance of 10.9 Mpc, for the given beam size of 127.9" x 77.3"). The HI dataof NGC 1792 and NGC 1808, with a velocity resolution of 6.6 km/s, confirm theresults of earlier VLA observations. Simultaneous wide-band 1.34 GHz continuumobservations also corroborate the results of earlier studies. However, thecontinuum flux of NGC 1808 measured by us is almost 20% higher than reportedpreviously. No radio continuum emission was detected from the type Ia supernovaSN1993af in the north-eastern spiral arm of NGC 1808. A comparison of NGC 1792and NGC 1808 shows that it is not primarily the total energy input that makesthe big difference between the starburst-related outflow in NGC 1808 and theabsence of such extraplanar features in NGC 1792, but the area over which theenergy released by stellar winds and supernovae is injected into the ISM.Comment: 10 pages, 7 figs, uses "aa.cls". Figs 1 and 5 bitmapped to save  space; full resolution figures available from  ftp://ftp.eso.org/pub/general/mdahlem/ Accepted for publication in A&

A search for intergalactic H I gas in the NGC 1808 group of galaxies