Our ATCA observations were obtained on 1997, Jan. 27-28, with the 750D configuration over a timerange of 13 hours. The total on-source integration time is 10 h. The ATCA correlator setup used by us provides a velocity resolution of 3.3 km s-1.
1934-638 was used as the primary flux calibrator and 1012-44 as phase calibrator. The measured flux of 1934-638 was 14.94 Jy at 1.42 GHz. The data reduction was performed in the standard fashion, using the software package MIRIAD. In order to achieve maximum sensitivity for extended emission, natural weighting of the visibilities was used. The disadvantage of this procedure, namely the low angular resolution of the images, is secondary for the current study.
With an angular extent of its radio emission of only a few arcmin (see below), NGC3175 fits easily into the primary beam of the ATCA's 22 m antennae of 34'. Therefore, no primary beam correction is necessary. With a shortest spacing of 31 m, flux losses due to missing short spacings are negligible.
Copyright ESO 2001