HI observations of southern LSB dwarf galaxies from the Karachentsev catalog

Walter K. Huchtmeier , Matthias Ehle , PASA, 16 (1), in press.

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Observations

We performed HI observations of 220 galaxies from the Karachentsev catalog using three different radio telescopes in order to achieve an all sky coverage. Galaxies north of declination -30$^\circ$ have been observed using the 100-m radio telescope at Effelsberg (half power beamwidth (HPBW) of 9.3'), galaxies in between -30$^\circ$ and -38$^\circ$ have been observed with the Nançay radio telescope (HPBW of 3.6' x 22' in R.A. and Dec. respectively). For the single dish observations a velocity coverage of 4400 kms-1 and a channel separation of 5 kms-1 was achieved.

40 Galaxies south of declination -38$^\circ$ have been observed with the Australia Telecope Compact Array in a snapshot mode (with the 750A configuration) resulting in a synthesized beam of about 1' , a velocity coverage of about 3000 kms-1 and a channel separation of 6.6 kms-1. Each galaxy was observed five to six times for 10 minutes at intervals of a few hours in order to achieve a decent coverage of the UV plane. In Fig.1 we display the global HI profiles of the 17 detected galaxies from our southern sample.

A pilot project with northern single-dish observations was published recently (Huchtmeier et al. 1997).

Figure 1: Global HI profiles of the 17 galaxies detected with the compact array of the ATNF. Profiles as narrow as 13.5 kms-1 (A1302-39) and as wide as 176 kms-1 (ESO137-G270) are found.
\begin{figure} \begin{center} \hspace*{0.5cm} \psfig{figure=huchtf1.ps,height=13cm,width=10cm} \end{center} \end{figure}


Next Section: Discussion
Title/Abstract Page: HI observations of southern
Previous Section: Introduction
Contents Page: Volume 16, Number 1

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